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The purpose of this page is not to provide complete engine repair information but rather some technical information about the engine design and information about common repairs and service requirements.  Some of the following documents may show information pertinent only to EuroVans and not necessarily equipment found on a Rialta.

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Volkswagen Diagnostic Trouble Codes
DTC Table - General

From model year 1996, vehicles manufactured for the North American market are equipped with a Government required diagnostic system known as On-Board Diagnostics II (OBD II).  This system monitors operation and function of all engine management system activity and automatic transmission operation to insure compliance with specified emission levels.

Vehicle emission levels are constantly monitored by the OBD II system and malfunctions are recognized and recorded.  A Malfunction Indicator Light (MIL) in the instrument cluster alerts the driver to the fault and the need to have the system checked for fault codes.  These codes follow a standard format and are known as Diagnostic Trouble Codes (DTCs).

DTCs are assigned two codes.  The first code is a numerical code assigned by the factory.  The second code is referred to as a P-code and follows a structure required by law and defined by the Society of Automotive Engineers (SAE).  This standard uses a letter to designate the system and four numbers to further identify and detail the malfunction as listed below.

First digit structure is as follows:

Pxxxx for powertrain
Bxxxx for body
Cxxxx for chassis
Uxxxx for future systems

Second digit structure is:

P0xxx Government required codes
P1xxx Manufacturer codes for additional emission system function; not required but reported to the government

Third digit structure is:

Px1xx measurement of air and fuel
Px2xx measurement of air and fuel
Px3xx ignition system
Px4xx additional emission control
Px5xx speed and idle regulation
Px6xx computer and output signals
Px7xx transmission
Px8xx transmission
Px9xx control modules, input and output signals

The fourth and fifth digits designate the individual components and systems.

VW Diagnostic Trouble Codes (DTCs) and data can be retrieved with VW/Audi Factory Scan Tools such as the VAG 1551, VAG 1552, or the new diagnostic computer VAS 5051 through a Data Link Connector (DLC).  Several aftermarket scan tools and computer programs are also capable of retrieving this information in this factory mode.  The factory mode also allows the scan tool to be used for other system diagnostic functions and information retrieval.

Some DTC information can also be retrieved in a generic mode.  The generic mode is not as complete as the factory mode, but allows commercially available scan tools to be used simply to read DTCs.  Generic scan tool mode does not have the capability to retrieve the detailed information of a manufacturer-specific scan tool.

Scan Tool Code Table

DTC P-Code Description
16394 P0010 -A- Camshaft Pos. Actuator Circ. Bank 1 Malfunction
16395 P0020 -A- Camshaft Pos. Actuator Circ. Bank 2 Malfunction
16449 P0065 Air Assisted Injector Control Range/Performance
16450 P0066 Air Assisted Injector Control Low Input/Short to ground
16451 P0067 Air Assisted Injector Control Input/Short to B+
16485 P0101 Mass or Volume Air Flow Circ Range/Performance
16486 P0102 Mass or Volume Air Flow Circ Low Input
16487 P0103 Mass or Volume Air Flow Circ High Input
16489 P0105 Manifold Abs.Pressure or Bar.Pressure Voltage supply
16490 P0106 Manifold Abs.Pressure or Bar.Pressure Range/Performance
16491 P0107 Manifold Abs.Pressure or Bar.Pressure Low Input
16492 P0108 Manifold Abs.Pressure or Bar.Pressure High Input
16496 P0112 Intake Air Temp.Circ Low Input
16497 P0113 Intake Air Temp.Circ High Input
16500 P0116 Engine Coolant Temp.Circ Range/Performance
16501 P0117 Engine Coolant Temp.Circ Low Input
16502 P0118 Engine Coolant Temp.Circ High Input
16504 P0120 Throttle/Pedal Pos.Sensor A Circ Malfunction
16505 P0121 Throttle/Pedal Pos.Sensor A Circ Range/Performance
16506 P0122 Throttle/Pedal Pos.Sensor A Circ Low Input
16507 P0123 Throttle/Pedal Pos.Sensor A Circ High Input
16509 P0125 Insufficient Coolant Temp.for Closed Loop Fuel Control
16512 P0128 Coolant Thermostat/Valve Temperature below control range
16514 P0130 O2 Sensor Circ.,Bank1-Sensor1 Malfunction
16515 P0131 O2 Sensor Circ.,Bank1-Sensor1 Low Voltage
16516 P0132 O2 Sensor Circ.,Bank1-Sensor1 High Voltage
16517 P0133 O2 Sensor Circ.,Bank1-Sensor1 Slow Response
16518 P0134 O2 Sensor Circ.,Bank1-Sensor1 No Activity Detected
16519 P0135 O2 Sensor Heater Circ.,Bank1-Sensor1 Malfunction
16520 P0136 O2 Sensor Circ.,Bank1-Sensor2 Malfunction
16521 P0137 O2 Sensor Circ.,Bank1-Sensor2 Low Voltage
16522 P0138 O2 Sensor Circ.,Bank1-Sensor2 High Voltage
16523 P0139 O2 Sensor Circ.,Bank1-Sensor2 Slow Response
16524 P0140 O2 Sensor Circ.,Bank1-Sensor2 No Activity Detected
16525 P0141 O2 Sensor Heater Circ.,Bank1-Sensor2 Malfunction
16534 P0150 O2 Sensor Circ.,Bank2-Sensor1 Malfunction
16535 P0151 O2 Sensor Circ.,Bank2-Sensor1 Low Voltage
16536 P0152 O2 Sensor Circ.,Bank2-Sensor1 High Voltage
16537 P0153 O2 Sensor Circ.,Bank2-Sensor1 Slow Response
16538 P0154 O2 Sensor Circ.,Bank2-Sensor1 No Activity Detected
16539 P0155 O2 Sensor Heater Circ.,Bank2-Sensor1 Malfunction
16540 P0156 O2 Sensor Circ.,Bank2-Sensor2 Malfunction
16541 P0157 O2 Sensor Circ.,Bank2-Sensor2 Low Voltage
16542 P0158 O2 Sensor Circ.,Bank2-Sensor2 High Voltage
16543 P0159 O2 Sensor Circ.,Bank2-Sensor2 Slow Response
16544 P0160 O2 Sensor Circ.,Bank2-Sensor2 No Activity Detected
16545 P0161 O2 Sensor Heater Circ.,Bank2-Sensor2 Malfunction
16554 P0170 Fuel Trim,Bank1 Malfunction
16555 P0171 Fuel Trim,Bank1 System too Lean
16556 P0172 Fuel Trim,Bank1 System too Rich
16557 P0173 Fuel Trim,Bank2 Malfunction
16558 P0174 Fuel Trim,Bank2 System too Lean
16559 P0175 Fuel Trim,Bank2 System too Rich
16566 P0182 Fuel temperature sender-G81 Short to ground
16567 P0183 Fuel temperature sender-G81 Interruption/Short to B+
16581 P0197 Engine Oil Temperature Circuit Low Input
16582 P0198 Engine Oil Temperature Circuit High Input
16585 P0201 Cyl.1, Injector Circuit Fault in electrical circuit
16586 P0202 Cyl.2, Injector Circuit Fault in electrical circuit
16587 P0203 Cyl.3, Injector Circuit Fault in electrical circuit
16588 P0204 Cyl.4, Injector Circuit Fault in electrical circuit
16589 P0205 Cyl.5 Injector Circuit Fault in electrical circuit
16590 P0206 Cyl.6 Injector Circuit Fault in electrical circuit
16591 P0207 Cyl.7 Injector Circuit Fault in electrical circuit
16592 P0208 Cyl.8 Injector Circuit Fault in electrical circuit
16599 P0215 Engine Shut-Off Solenoid Malfunction
16600 P0216 Injector/Injection Timing Control Malfunction
16603 P0219 Engine Overspeed Condition
16605 P0221 Throttle Pos. Sensor -B- Circuit Range/Performance
16606 P0222 Throttle Pos. Sensor -B- Circuit Low Input
16607 P0223 Throttle Pos. Sensor -B- Circuit High Input
16609 P0225 Throttle Pos. Sensor -C- Circuit Voltage supply
16610 P0226 Throttle Pos. Sensor -C- Circuit Range/Performance
16611 P0227 Throttle Pos. Sensor -C- Circuit Low Input
16612 P0228 Throttle Pos. Sensor -C- Circuit Hight Input
16614 P0230 Fuel Pump Primary Circuit Fault in electrical circuit
16618 P0234 Turbocharger Overboost Condition Control limit exceeded
16619 P0235 Turbocharger Boost Sensor (A) Circ Control limit not reached
16620 P0236 Turbocharger Boost Sensor (A) Circ Range/Performance
16621 P0237 Turbocharger Boost Sensor (A) Circ Low Input
16622 P0238 Turbocharger Boost Sensor (A) Circ High Input
16627 P0243 Turbocharger Wastegate Solenoid (A) Open/Short Circuit to Ground
16629 P0245 Turbocharger Wastegate Solenoid (A) Low Input/Short to ground
16630 P0246 Turbocharger Wastegate Solenoid (A) High Input/Short to B+
16636 P0252 Injection Pump Metering Control (A) Range/Performance
16645 P0261 Cyl.1 Injector Circuit Low Input/Short to ground
16646 P0262 Cyl.1 Injector Circuit High Input/Short to B+
16648 P0264 Cyl.2 Injector Circuit Low Input/Short to ground
16649 P0265 Cyl.2 Injector Circuit High Input/Short to B+
16651 P0267 Cyl.3 Injector Circuit Low Input/Short to ground
16652 P0268 Cyl.3 Injector Circuit High Input/Short to B+
16654 P0270 Cyl.4 Injector Circuit Low Input/Short to ground
16655 P0271 Cyl.4 Injector Circuit High Input/Short to B+
16657 P0273 Cyl.5 Injector Circuit Low Input/Short to ground
16658 P0274 Cyl.5 Injector Circuit High Input/Short to B+
16660 P0276 Cyl.6 Injector Circuit Low Input/Short to ground
16661 P0277 Cyl.6 Injector Circuit High Input/Short to B+
16663 P0279 Cyl.7 Injector Circuit Low Input/Short to ground
16664 P0280 Cyl.7 Injector Circuit High Input/Short to B+
16666 P0282 Cyl.8 Injector Circuit Low Input/Short to ground
16667 P0283 Cyl.8 Injector Circuit High Input/Short to B+
16684 P0300 Random/Multiple Cylinder Misfire Detected
16685 P0301 Cyl.1 Misfire Detected
16686 P0302 Cyl.2 Misfire Detected
16687 P0303 Cyl.3 Misfire Detected
16688 P0304 Cyl.4 Misfire Detected
16689 P0305 Cyl.5 Misfire Detected
16690 P0306 Cyl.6 Misfire Detected
16691 P0307 Cyl.7 Misfire Detected
16692 P0308 Cyl.8 Misfire Detected
16697 P0313 Misfire Detected Low Fuel Level
16698 P0314 Single Cylinder Misfire
16705 P0321 Ign./Distributor Eng.Speed Inp.Circ Range/Performance
16706 P0322 Ign./Distributor Eng.Speed Inp.Circ No Signal
16709 P0325 Knock Sensor 1 Circuit Electrical Fault in Circuit
16710 P0326 Knock Sensor 1 Circuit Range/Performance
16711 P0327 Knock Sensor 1 Circ Low Input
16712 P0328 Knock Sensor 1 Circ High Input
16716 P0332 Knock Sensor 2 Circ Low Input
16717 P0333 Knock Sensor 2 Circ High Input
16719 P0335 Crankshaft Pos. Sensor (A) Circ Malfunction
16720 P0336 Crankshaft Pos. Sensor (A) Circ Range/Performance/Missing tooth
16721 P0337 Crankshaft Pos.Sensor (A) Circ Low Input
16724 P0340 Camshaft Pos. Sensor (A) Circ Incorrect allocation
16725 P0341 Camshaft Pos.Sensor Circ Range/Performance
16726 P0342 Camshaft Pos.Sensor Circ Low Input
16727 P0343 Camshaft Pos.Sensor Circ High Input
16735 P0351 Ignition Coil (A) Cyl.1 Prim./Sec. Circ Malfunction
16736 P0352 Ignition Coil (B) Cyl.2 Prim./Sec. Circ Malfunction
16737 P0353 Ignition Coil (C) Cyl.3 Prim./Sec. Circ Malfunction
16738 P0354 Ignition Coil (D) Cyl.4 Prim./Sec. Circ Malfunction
16739 P0355 Ignition Coil (E) Cyl.5 Prim./Sec. Circ Malfunction
16740 P0356 Ignition Coil (F) Cyl.6 Prim./Sec. Circ Malfunction
16741 P0357 Ignition Coil (G) Cyl.7 Prim./Sec. Circ Malfunction
16742 P0358 Ignition Coil (H) Cyl.8 Prim./Sec. Circ Malfunction
16764 P0380 Glow Plug/Heater Circuit (A) Electrical Fault in Circuit
16784 P0400 Exhaust Gas Recirc.Flow Malfunction
16785 P0401 Exhaust Gas Recirc.Flow Insufficient Detected
16786 P0402 Exhaust Gas Recirc.Flow Excessive Detected
16787 P0403 Exhaust Gas Recirc. Contr. Circ Malfunction
16788 P0404 Exhaust Gas Recirc. Contr. Circ Range/Performance
16789 P0405 Exhaust Gas Recirc. Sensor (A) Circ Low Input
16790 P0406 Exhaust Gas Recirc. Sensor (A) Circ High Input
16791 P0407 Exhaust Gas Recirc. Sensor (B) Circ Low Input
16792 P0408 Exhaust Gas Recirc. Sensor (B) Circ High Input
16794 P0410 Sec.Air Inj.Sys Malfunction
16795 P0411 Sec.Air Inj.Sys. Incorrect Flow Detected
16796 P0412 Sec.Air Inj.Sys.Switching Valve A Circ Malfunction
16802 P0418 Sec. Air Inj. Sys. Relay (A) Contr. Circ Malfunction
16804 P0420 Catalyst System,Bank1 Efficiency Below Threshold
16806 P0422 Main Catalyst,Bank1 Below Threshold
16811 P0427 Catalyst Temperature Sensor, Bank 1 Low Input/Short to ground
16812 P0428 Catalyst Temperature Sensor, Bank 1 High Input/Open/Short Circuit to B+
16816 P0432 Main Catalyst,Bank2 Efficiency Below Threshold
16820 P0436 Catalyst Temperature Sensor, Bank 2 Range/Performance
16821 P0437 Catalyst Temperature Sensor, Bank 2 Low Input/Short to ground
16822 P0438 Catalyst Temperature Sensor, Bank 2 High Input/Open/Short Circuit to B+
16824 P0440 EVAP Emission Contr.Sys. Malfunction
16825 P0441 EVAP Emission Contr.Sys.Incorrect Purge Flow
16826 P0442 EVAP Emission Contr.Sys.(Small Leak) Leak Detected
16827 P0443 EVAP Emiss. Contr. Sys. Purge Valve Circ Electrical Fault in Circuit
16836 P0452 EVAP Emission Contr.Sys.Press.Sensor Low Input
16837 P0453 EVAP Emission Contr.Sys.Press.Sensor High Input
16839 P0455 EVAP Emission Contr.Sys.(Gross Leak) Leak Detected
16845 P0461 Fuel Level Sensor Circ Range/Performance
16846 P0462 Fuel Level Sensor Circuit Low Input
16847 P0463 Fuel Level Sensor Circuit High Input
16885 P0501 Vehicle Speed Sensor Range/Performance
16887 P0503 Vehicle Speed Sensor Intermittent/Erratic/High Input
16889 P0505 Idle Control System Malfunction
16890 P0506 Idle Control System RPM Lower than Expected
16891 P0507 Idle Control System Higher than Expected
16894 P0510 Closed Throttle Pos.Switch Malfunction
16915 P0531 A/C Refrigerant Pressure Sensor Circuit Range/Performance
16916 P0532 A/C Refrigerant Pressure Sensor Circuit Low Input
16917 P0533 A/C Refrigerant Pressure Sensor Circuit High Input
16935 P0551 Power Steering Pressure Sensor Circuit Range/Performance
16944 P0560 System Voltage Malfunction
16946 P0562 System Voltage Low Voltage
16947 P0563 System Voltage High Voltage
16952 P0568 Cruise Control Set Signal Incorrect Signal
16955 P0571 Cruise/Brake Switch (A) Circ Malfunction
16984 P0600 Serial Comm. Link (Data Bus) Message Missing
16985 P0601 Internal Contr.Module Memory Check Sum Error
16986 P0602 Control Module Programming Error/Malfunction
16987 P0603 Internal Contr.Module (KAM) Error
16988 P0604 Internal Contr.Module Random Access Memory (RAM) Error
16989 P0605 Internal Contr.Module ROM Test Error
16990 P0606 ECM/PCM Processor
17026 P0642 Knock Control Control Module Malfunction
17029 P0645 A/C Clutch Relay Control Circuit
17034 P0650 MIL Control Circuit Electrical Fault in Circuit
17038 P0654 Engine RPM Output Circuit Electrical Fault in Circuit
17040 P0656 Fuel Level Output Circuit Electrical Fault in Circuit
17084 P0700 Transm.Contr.System Malfunction
17086 P0702 Transm.Contr.System Electrical
17087 P0703 Torque Converter/Brake Switch B Circ Malfunction
17089 P0705 Transm.Range Sensor Circ.(PRNDL Inp.) Malfunction
17090 P0706 Transm.Range Sensor Circ Range/Performance
17091 P0707 Transm.Range Sensor Circ Low Input
17092 P0708 Transm.Range Sensor Circ High Input
17094 P0710 Transm.Fluid Temp.Sensor Circ. Malfunction
17095 P0711 Transm.Fluid Temp.Sensor Circ. Range/Performance
17096 P0712 Transm.Fluid Temp.Sensor Circ. Low Input
17097 P0713 Transm.Fluid Temp.Sensor Circ. High Input
17099 P0715 Input Turbine/Speed Sensor Circ. Malfunction
17100 P0716 Input Turbine/Speed Sensor Circ. Range/Performance
17101 P0717 Input Turbine/Speed Sensor Circ. No Signal
17105 P0721 Output Speed Sensor Circ Range/Performance
17106 P0722 Output Speed Sensor Circ No Signal
17109 P0725 Engine Speed Inp.Circ. Malfunction
17110 P0726 Engine Speed Inp.Circ. Range/Performance
17111 P0727 Engine Speed Inp.Circ. No Signal
17114 P0730 Gear Incorrect Ratio
17115 P0731 Gear 1 Incorrect Ratio
17116 P0732 Gear 2 Incorrect Ratio
17117 P0733 Gear 3 Incorrect Ratio
17118 P0734 Gear 4 Incorrect Ratio
17119 P0735 Gear 5 Incorrect Ratio
17124 P0740 Torque Converter Clutch Circ Malfunction
17125 P0741 Torque Converter Clutch Circ Performance or Stuck Off
17132 P0748 Pressure Contr.Solenoid Electrical
17134 P0750 Shift Solenoid A malfunction
17135 P0751 Shift Solenoid A Performance or Stuck Off
17136 P0752 Shift Solenoid A Stuck On
17137 P0753 Shift Solenoid A Electrical
17140 P0756 Shift Solenoid B Performance or Stuck Off
17141 P0757 Shift Solenoid B Stuck On
17142 P0758 Shift Solenoid B Electrical
17145 P0761 Shift Solenoid C Performance or Stuck Off
17146 P0762 Shift Solenoid C Stuck On
17147 P0763 Shift Solenoid C Electrical
17152 P0768 Shift Solenoid D Electrical
17157 P0773 Shift Solenoid E Electrical
17174 P0790 Normal/Performance Switch Circ Malfunction
17509 P1101 O2 Sensor Circ.,Bank1-Sensor1Voltage too Low/Air Leak
17510 P1102 O2 Sensor Heating Circ.,Bank1-Sensor1 Short to B+
17511 P1103 O2 Sensor Heating Circ.,Bank1-Sensor1 Output too Low
17512 P1104 Bank1-Sensor2 Voltage too Low/Air Leak
17513 P1105 O2 Sensor Heating Circ.,Bank1-Sensor2 Short to B+
17514 P1106 O2 Sensor Circ.,Bank2-Sensor1 Voltage too Low/Air Leak
17515 P1107 O2 Sensor Heating Circ.,Bank2-Sensor1 Short to B+
17516 P1108 O2 Sensor Heating Circ.,Bank2-Sensor1 Output too Low
17517 P1109 O2 Sensor Circ.,Bank2-Sensor2 Voltage too Low/Air Leak
17518 P1110 O2 Sensor Heating Circ.,Bank2-Sensor2 Short to B+
17519 P1111 O2 Control (Bank 1) System too lean
17520 P1112 O2 Control (Bank 1) System too rich
17521 P1113 Bank1-Sensor1 Internal Resistance too High
17522 P1114 Bank1-Sensor2 Internal Resistant too High
17523 P1115 O2 Sensor Heater Circ.,Bank1-Sensor1 Short to Ground
17524 P1116 O2 Sensor Heater Circ.,Bank1-Sensor1 Open
17525 P1117 O2 Sensor Heater Circ.,Bank1-Sensor2 Short to Ground
17526 P1118 O2 Sensor Heater Circ.,Bank1-Sensor2 Open
17527 P1119 O2 Sensor Heater Circ.,Bank2-Sensor1 Short to Ground
17528 P1120 O2 Sensor Heater Circ.,Bank2-Sensor1 Open
17529 P1121 O2 Sensor Heater Circ.,Bank2-Sensor2 Short to Ground
17530 P1122 O2 Sensor Heater Circ.,Bank2-Sensor2 Open
17531 P1123 Long Term Fuel Trim Add.Air.,Bank1 System too Rich
17532 P1124 Long Term Fuel Trim Add.Air.,Bank1 System too Lean
17533 P1125 Long Term Fuel Trim Add.Air.,Bank2 System too Rich
17534 P1126 Long Term Fuel Trim Add.Air.,Bank2 System too Lean
17535 P1127 Long Term Fuel Trim mult.,Bank1 System too Rich
17536 P1128 Long Term Fuel Trim mult.,Bank1 System too Lean
17537 P1129 Long Term Fuel Trim mult.,Bank2 System too Rich
17538 P1130 Long Term Fuel Trim mult.,Bank2 System too Lean
17539 P1131 Bank2-Sensor1 Internal Rsistance too High
17540 P1132 O2 Sensor Heating Circ.,Bank1+2-Sensor1 Short to B+
17541 P1133 O2 Sensor Heating Circ.,Bank1+2-Sensor1 Electrical Malfunction
17542 P1134 O2 Sensor Heating Circ.,Bank1+2-Sensor2 Short to B+
17543 P1135 O2 Sensor Heating Circ.,Bank1+2-Sensor2 Electrical Malfunction
17544 P1136 Long Term Fuel Trim Add.Fuel,Bank1 System too Lean
17545 P1137 Long Term Fuel Trim Add.Fuel,Bank1 System too Rich
17546 P1138 Long Term Fuel Trim Add.Fuel,Bank2 System too Lean
17547 P1139 Long Term Fuel Trim Add.Fuel,Bank2 System too Rich
17548 P1140 Bank2-Sensor2 Internal Resistance too High
17549 P1141 Load Calculation Cross Check Range/Performance
17550 P1142 Load Calculation Cross Check Lower Limit Exceeded
17551 P1143 Load Calculation Cross Check Upper Limit Exceeded
17552 P1144 Mass or Volume Air Flow Circ Open/Short to Ground
17553 P1145 Mass or Volume Air Flow Circ Short to B+
17554 P1146 Mass or Volume Air Flow Circ Supply Malfunction
17555 P1147 O2 Control (Bank 2) System too lean
17556 P1148 O2 Control (Bank 2) System too rich
17557 P1149 O2 Control (Bank 1) Out of range
17558 P1150 O2 Control (Bank 2) Out of range
17559 P1151 Bank1, Long Term Fuel Trim, Range 1 Leanness Lower Limit Exceeded
17560 P1152 Bank1, Long Term Fuel Trim, Range 2 Leanness Lower Limit Exceeded
17562 P1154 Manifold Switch Over Malfunction
17563 P1155 Manifold Abs.Pressure Sensor Circ. Short to B+
17564 P1156 Manifold Abs.Pressure Sensor Circ. Open/Short to Ground
17565 P1157 Manifold Abs.Pressure Sensor Circ. Power Supply Malfunction
17566 P1158 Manifold Abs.Pressure Sensor Circ. Range/Performance
17568 P1160 Manifold Temp.Sensor Circ. Short to Ground
17569 P1161 Manifold Temp.Sensor Circ. Open/Short to B+
17570 P1162 Fuel Temp.Sensor Circ. Short to Ground
17571 P1163 Fuel Temp.Sensor Circ. Open/Short to B+
17572 P1164 Fuel Temperature Sensor Range/Performance/Incorrect Signal
17573 P1165 Bank1, Long Term Fuel Trim, Range 1 Rich Limit Exceeded
17574 P1166 Bank1, Long Term Fuel Trim, Range 2 Rich Limit Exceeded
17579 P1171 Throttle Actuation Potentiometer Sign.2 Range/Performance
17580 P1172 Throttle Actuation Potentiometer Sign.2 Signal too Low
17581 P1173 Throttle Actuation Potentiometer Sign.2 Signal too High
17582 P1174 Fuel Trim, Bank 1 Different injection times
17584 P1176 O2 Correction Behind Catalyst,B1 Limit Attained
17585 P1177 O2 Correction Behind Catalyst,B2 Limit Attained
17586 P1178 Linear 02 Sensor / Pump Current Open Circuit
17587 P1179 Linear 02 Sensor / Pump Current Short to ground
17588 P1180 Linear 02 Sensor / Pump Current Short to B+
17589 P1181 Linear 02 Sensor / Reference Voltage Open Circuit
17590 P1182 Linear 02 Sensor / Reference Voltage Short to ground
17591 P1183 Linear 02 Sensor / Reference Voltage Short to B+
17592 P1184 Linear 02 Sensor / Common Ground Wire Open Circuit
17593 P1185 Linear 02 Sensor / Common Ground Wire Short to ground
17594 P1186 Linear 02 Sensor / Common Ground Wire Short to B+
17595 P1187 Linear 02 Sensor / Compens. Resistor Open Circuit
17596 P1188 Linear 02 Sensor / Compens. Resistor Short to ground
17597 P1189 Linear 02 Sensor / Compens. Resistor Short to B+
17598 P1190 Linear 02 Sensor / Reference Voltage Incorrect Signal
17604 P1196 O2 Sensor Heater Circ.,Bank1-Sensor1 Electrical Malfunction
17605 P1197 O2 Sensor Heater Circ.,Bank2-Sensor1 Electrical Malfunction
17606 P1198 O2 Sensor Heater Circ.,Bank1-Sensor2 Electrical Malfunction
17607 P1199 O2 Sensor Heater Circ.,Bank2-Sensor2 Electrical Malfunction
17609 P1201 Cyl.1-Fuel Inj.Circ. Electrical Malfunction
17610 P1202 Cyl.2-Fuel Inj.Circ. Electrical Malfunction
17611 P1203 Cyl.3-Fuel Inj.Circ. Electrical Malfunction
17612 P1204 Cyl.4-Fuel Inj.Circ. Electrical Malfunction
17613 P1205 Cyl.5-Fuel Inj.Circ. Electrical Malfunction
17614 P1206 Cyl.6-Fuel Inj.Circ. Electrical Malfunction
17615 P1207 Cyl.7-Fuel Inj.Circ. Electrical Malfunction
17616 P1208 Cyl.8-Fuel Inj.Circ. Electrical Malfunction
17617 P1209 Intake valves for cylinder shut-off Short circuit to ground
17618 P1210 Intake valves for cylinder shut-off Short to B+
17619 P1211 Intake valves for cylinder shut-off Open circuit
17621 P1213 Cyl.1-Fuel Inj.Circ. Short to B+
17622 P1214 Cyl.2-Fuel Inj.Circ. Short to B+
17623 P1215 Cyl.3-Fuel Inj.Circ. Short to B+
17624 P1216 Cyl.4-Fuel Inj.Circ. Short to B+
17625 P1217 Cyl.5-Fuel Inj.Circ. Short to B+
17626 P1218 Cyl.6-Fuel Inj.Circ. Short to B+
17627 P1219 Cyl.7-Fuel Inj.Circ. Short to B+
17628 P1220 Cyl.8-Fuel Inj.Circ. Short to B+
17629 P1221 Cylinder shut-off exhaust valves Short circuit to ground
17630 P1222 Cylinder shut-off exhaust valves Short to B+
17631 P1223 Cylinder shut-off exhaust valves Open circuit
17633 P1225 Cyl.1-Fuel Inj.Circ. Short to Ground
17634 P1226 Cyl.2-Fuel Inj.Circ. Short to Ground
17635 P1227 Cyl.3-Fuel Inj.Circ. Short to Ground
17636 P1228 Cyl.4-Fuel Inj.Circ. Short to Ground
17637 P1229 Cyl.5-Fuel Inj.Circ. Short to Ground
17638 P1230 Cyl.6-Fuel Inj.Circ. Short to Ground
17639 P1231 Cyl.7-Fuel Inj.Circ. Short to Ground
17640 P1232 Cyl.8-Fuel Inj.Circ. Short to Ground
17645 P1237 Cyl.1-Fuel Inj.Circ. Open Circ.
17646 P1238 Cyl.2-Fuel Inj.Circ. Open Circ.
17647 P1239 Cyl.3-Fuel Inj.Circ. Open Circ.
17648 P1240 Cyl.4-Fuel Inj.Circ. Open Circ.
17649 P1241 Cyl.5-Fuel Inj.Circ. Open Circ.
17650 P1242 Cyl.6-Fuel Inj.Circ. Open Circ.
17651 P1243 Cyl.7-Fuel Inj.Circ. Open Circ.
17652 P1244 Cyl.8-Fuel Inj.Circ. Open Circ.
17653 P1245 Needle Lift Sensor Circ. Short to Ground
17654 P1246 Needle Lift Sensor Circ. Range/Performance
17655 P1247 Needle Lift Sensor Circ. Open/Short to B+
17656 P1248 Injection Start Control Deviation
17657 P1249 Fuel consumption signal Electrical Fault in Circuit
17658 P1250 Fuel Level Too Low
17659 P1251 Start of Injection Solenoid Circ Short to B+
17660 P1252 Start of Injection Solenoid Circ Open/Short to Ground
17661 P1253 Fuel consumption signal Short to ground
17662 P1254 Fuel consumption signal Short to B+
17663 P1255 Engine Coolant Temp.Circ Short to Ground
17664 P1256 Engine Coolant Temp.Circ Open/Short to B+
17665 P1257 Engine Coolant System Valve Open
17666 P1258 Engine Coolant System Valve Short to B+
17667 P1259 Engine Coolant System Valve Short to Ground
17688 P1280 Fuel Inj.Air Contr.Valve Circ. Flow too Low
17691 P1283 Fuel Inj.Air Contr.Valve Circ. Electrical Malfunction
17692 P1284 Fuel Inj.Air Contr.Valve Circ. Open
17693 P1285 Fuel Inj.Air Contr.Valve Circ. Short to Ground
17694 P1286 Fuel Inj.Air Contr.Valve Circ. Short to B+
17695 P1287 Turbocharger bypass valve open
17696 P1288 Turbocharger bypass valve short to B+
17697 P1289 Turbocharger bypass valve short to ground
17704 P1296 Cooling system malfunction
17705 P1297 Connection turbocharger - throttle valve pressure hose
17708 P1300 Misfire detected Reason: Fuel level too low
17721 P1319 Knock Sensor 1 Circ. Short to Ground
17728 P1320 Knock Sensor 2 Circ. Short to Ground
17729 P1321 Knock Sensor 3 Circ. Low Input
17730 P1322 Knock Sensor 3 Circ. High Input
17731 P1323 Knock Sensor 4 Circ. Low Input
17732 P1324 Knock Sensor 4 Circ. High Input
17733 P1325 Cyl.1-Knock Contr. Limit Attained
17734 P1326 Cyl.2-Knock Contr. Limit Attained
17735 P1327 Cyl.3-Knock Contr. Limit Attained
17736 P1328 Cyl.4-Knock Contr. Limit Attained
17737 P1329 Cyl.5-Knock Contr. Limit Attained
17738 P1330 Cyl.6-Knock Contr. Limit Attained
17739 P1331 Cyl.7-Knock Contr. Limit Attained
17740 P1332 Cyl.8-Knock Contr. Limit Attained
17743 P1335 Engine Torque Monitoring 2 Control Limint Exceeded
17744 P1336 Engine Torque Monitoring Adaptation at limit
17745 P1337 Camshaft Pos.Sensor,Bank1 Short to Ground
17746 P1338 Camshaft Pos.Sensor,Bank1 Open Circ./Short to B+
17747 P1339 Crankshaft Pos./Engine Speed Sensor Cross Connected
17748 P1340 Crankshaft-/Camshaft Pos.Sens.Signals Out of Sequence
17749 P1341 Ignition Coil Power Output Stage 1 Short to Ground
17750 P1342 Ignition Coil Power Output Stage 1 Short to B+
17751 P1343 Ignition Coil Power Output Stage 2 Short to Ground
17752 P1344 Ignition Coil Power Output Stage 2 Short to B+
17753 P1345 Ignition Coil Power Output Stage 3 Short to Ground
17754 P1346 Ignition Coil Power Output Stage 3 Short to B+
17755 P1347 Bank2,Crankshaft-/Camshaft os.Sens.Sign. Out of Sequence
17756 P1348 Ignition Coil Power Output Stage 1 Open Circuit
17757 P1349 Ignition Coil Power Output Stage 2 Open Circuit
17758 P1350 Ignition Coil Power Output Stage 3 Open Circuit
17762 P1354 Modulation Piston Displ.Sensor Circ. Malfunction
17763 P1355 Cyl. 1, ignition circuit Open Circuit
17764 P1356 Cyl. 1, ignition circuit Short to B+
17765 P1357 Cyl. 1, ignition circuit Short to ground
17766 P1358 Cyl. 2, ignition circuit Open Circuit
17767 P1359 Cyl. 2, ignition circuit Short Circuit to B+
17768 P1360 Cyl. 2, ignition circuit Short Circuit to Ground
17769 P1361 Cyl. 3, ignition circuit Open Circuit
17770 P1362 Cyl. 3, ignition circuit Short Circuit to B+
17771 P1363 Cyl. 3, ignition circuit Short Circuit to ground
17772 P1364 Cyl. 4 ignition circuit Open Circuit
17773 P1365 Cyl. 4 ignition circuit Short circuit to B+
17774 P1366 Cyl. 4 ignition circuit Short circuit to ground
17775 P1367 Cyl. 5, ignition circuit Open Circuit
17776 P1368 Cyl. 5, ignition circuit Short Circuit to B+
17777 P1369 Cyl. 5, ignition circuit short to ground
17778 P1370 Cyl. 6, ignition circuit Open Circuit
17779 P1371 Cyl. 6, ignition circuit Short Circuit to B+
17780 P1372 Cyl. 6, ignition circuit short to ground
17781 P1373 Cyl. 7, ignition circuit Open Circuit
17782 P1374 Cyl. 7, ignition circuit Short Circuit to B+
17783 P1375 Cyl. 7, ignition circuit short to ground
17784 P1376 Cyl. 8, ignition circuit Open Circuit
17785 P1377 Cyl. 8, ignition circuit Short Circuit to B+
17786 P1378 Cyl. 8, ignition circuit short to ground
17794 P1386 Internal Control Module Knock Control Circ.Error
17795 P1387 Internal Contr. Module altitude sensor error
17796 P1388 Internal Contr. Module drive by wire error
17799 P1391 Camshaft Pos.Sensor,Bank2 Short to Ground
17800 P1392 Camshaft Pos.Sensor,Bank2 Open Circ./Short to B+
17801 P1393 Ignition Coil Power Output Stage 1 Electrical Malfunction
17802 P1394 Ignition Coil Power Output Stage 2 Electrical Malfunction
17803 P1395 Ignition Coil Power Output Stage 3 Electrical Malfunction
17804 P1396 Engine Speed Sensor Missing Tooth
17805 P1397 Engine speed wheel Adaptation limit reached
17806 P1398 Engine RPM signal, TD Short to ground
17807 P1399 Engine RPM signal, TD Short Circuit to B+
17808 P1400 EGR Valve Circ Electrical Malfunction
17809 P1401 EGR Valve Circ Short to Ground
17810 P1402 EGR Valve Circ Short to B+
17811 P1403 EGR Flow Deviation
17812 P1404 EGR Flow Basic Setting not carried out
17814 P1406 EGR Temp.Sensor Range/Performance
17815 P1407 EGR Temp.Sensor Signal too Low
17816 P1408 EGR Temp.Sensor Signal too High
17817 P1409 Tank Ventilation Valve Circ. Electrical Malfunction
17818 P1410 Tank Ventilation Valve Circ. Short to B+
17819 P1411 Sec.Air Inj.Sys.,Bank2 Flow too Flow
17820 P1412 EGR Different.Pressure Sensor Signal too Low
17821 P1413 EGR Different.Pressure Sensor Signal too High
17822 P1414 Sec.Air Inj.Sys.,Bank2 Leak Detected
17825 P1417 Fuel Level Sensor Circ Signal too Low
17826 P1418 Fuel Level Sensor Circ Signal too High
17828 P1420 Sec.Air Inj.Valve Circ Electrical Malfunction
17829 P1421 Sec.Air Inj.Valve Circ Short to Ground
17830 P1422 Sec.Air Inj.Sys.Contr.Valve Circ Short to B+
17831 P1423 Sec.Air Inj.Sys.,Bank1 Flow too Low
17832 P1424 Sec.Air Inj.Sys.,Bank1 Leak Detected
17833 P1425 Tank Vent.Valve Short to Ground
17834 P1426 Tank Vent.Valve Open
17840 P1432 Sec.Air Inj.Valve Open
17841 P1433 Sec.Air Inj.Sys.Pump Relay Circ. open
17842 P1434 Sec.Air Inj.Sys.Pump Relay Circ. Short to B+
17843 P1435 Sec.Air Inj.Sys.Pump Relay Circ. Short to ground
17844 P1436 Sec.Air Inj.Sys.Pump Relay Circ. Electrical Malfunction
17847 P1439 EGR Potentiometer Error in Basic Seting
17848 P1440 EGR Valve Power Stage Open
17849 P1441 EGR Valve Circ Open/Short to Ground
17850 P1442 EGR Valve Position Sensor Signal too high
17851 P1443 EGR Valve Position Sensor Signal too low
17852 P1444 EGR Valve Position Sensor range/performance
17853 P1445 Catalyst Temp.Sensor 2 Circ. Range/Performance
17854 P1446 Catalyst Temp.Circ Short to Ground
17855 P1447 Catalyst Temp.Circ Open/Short to B+
17856 P1448 Catalyst Temp.Sensor 2 Circ. Short to Ground
17857 P1449 Catalyst Temp.Sensor 2 Circ. Open/Short to B+
17858 P1450 Sec.Air Inj.Sys.Circ Short to B+
17859 P1451 Sec.Air Inj.Sys.Circ Short to Ground
17860 P1452 Sec.Air Inj.Sys. Open Circ.
17861 P1453 Exhaust gas temperature sensor 1 open/short to B+
17862 P1454 Exhaust gas temperature sensor short 1 to ground
17863 P1455 Exhaust gas temperature sensor 1 range/performance
17864 P1456 Exhaust gas temperature control bank 1 limit attained
17865 P1457 Exhaust gas temperature sensor 2 open/short to B+
17866 P1458 Exhaust gas temperature sensor 2 short to ground
17867 P1459 Exhaust gas temperature sensor 2 range/performance
17868 P1460 Exhaust gas temperature control bank 2 limit attained
17869 P1461 Exhaust gas temperature control bank 1 Range/Performance
17870 P1462 Exhaust gas temperature control bank 2 Range/Performance
17873 P1465 Additive Pump Short Circuit to B+
17874 P1466 Additive Pump Open/Short to Ground
17875 P1467 EVAP Canister Purge Solenoid Valve Short Circuit to B+
17876 P1468 EVAP Canister Purge Solenoid Valve Short Circuit to Ground
17877 P1469 EVAP Canister Purge Solenoid Valve Open Circuit
17878 P1470 EVAP Emission Contr.LDP Circ Electrical Malfunction
17879 P1471 EVAP Emission Contr.LDP Circ Short to B+
17880 P1472 EVAP Emission Contr.LDP Circ Short to Ground
17881 P1473 EVAP Emission Contr.LDP Circ Open Circ.
17882 P1474 EVAP Canister Purge Solenoid Valve electrical malfunction
17883 P1475 EVAP Emission Contr.LDP Circ Malfunction/Signal Circ.Open
17884 P1476 EVAP Emission Contr.LDP Circ Malfunction/Insufficient Vacuum
17885 P1477 EVAP Emission Contr.LDP Circ Malfunction
17886 P1478 EVAP Emission Contr.LDP Circ Clamped Tube Detected
17908 P1500 Fuel Pump Relay Circ. Electrical Malfunction
17909 P1501 Fuel Pump Relay Circ. Short to Ground
17910 P1502 Fuel Pump Relay Circ. Short to B+
17911 P1503 Load signal from Alternator Term. DF Range/performance/Incorrect Signal
17912 P1504 Intake Air Sys.Bypass Leak Detected
17913 P1505 Closed Throttle Pos. Does Not Close/Open Circ
17914 P1506 Closed Throttle Pos.Switch Does Not Open/Short to Ground
17915 P1507 Idle Sys.Learned Value Lower Limit Attained
17916 P1508 Idle Sys.Learned Value Upper Limit Attained
17917 P1509 Idle Air Control Circ. Electrical Malfunction
17918 P1510 Idle Air Control Circ. Short to B+
17919 P1511 Intake Manifold Changeover Valve circuit electrical malfunction
17920 P1512 Intake Manifold Changeover Valve circuit Short to B+
17921 P1513 Intake Manifold Changeover Valve2 circuit Short to B+
17922 P1514 Intake Manifold Changeover Valve2 circuit Short to ground
17923 P1515 Intake Manifold Changeover Valve circuit Short to Ground
17924 P1516 Intake Manifold Changeover Valve circuit Open
17925 P1517 Main Relay Circ. Electrical Malfunction
17926 P1518 Main Relay Circ. Short to B+
17927 P1519 Intake Camshaft Contr.,Bank1 Malfunction
17928 P1520 Intake Manifold Changeover Valve2 circuit Open
17929 P1521 Intake Manifold Changeover Valve2 circuit electrical malfunction
17930 P1522 Intake Camshaft Contr.,Bank2 Malfunction
17931 P1523 Crash Signal from Airbag Control Unit range/performance
17933 P1525 Intake Camshaft Contr.Circ.,Bank1 Electrical Malfunction
17934 P1526 Intake Camshaft Contr.Circ.,Bank1 Short to B+
17935 P1527 Intake Camshaft Contr.Circ.,Bank1 Short to Ground
17936 P1528 Intake Camshaft Contr.Circ.,Bank1 Open
17937 P1529 Camshaft Control Circuit Short to B+
17938 P1530 Camshaft Control Circuit Short to ground
17939 P1531 Camshaft Control Circuit open
17941 P1533 Intake Camshaft Contr.Circ.,Bank2 Electrical Malfunction
17942 P1534 Intake Camshaft Contr.Circ.,Bank2 Short to B+
17943 P1535 Intake Camshaft Contr.Circ.,Bank2 Short to Ground
17944 P1536 Intake Camshaft Contr.Circ.,Bank2 Open
17945 P1537 Engine Shutoff Solenoid Malfunction
17946 P1538 Engine Shutoff Solenoid Open/Short to Ground
17947 P1539 Clutch Vacuum Vent Valve Switch Incorrect signal
17948 P1540 Vehicle Speed Sensor High Input
17949 P1541 Fuel Pump Relay Circ Open
17950 P1542 Throttle Actuation Potentiometer Range/Performance
17951 P1543 Throttle Actuation Potentiometer Signal too Low
17952 P1544 Throttle Actuation Potentiometer Signal too High
17953 P1545 Throttle Pos.Contr Malfunction
17954 P1546 Boost Pressure Contr.Valve Short to B+
17955 P1547 Boost Pressure Contr.Valve Short to Ground
17956 P1548 Boost Pressure Contr.Valve Open
17957 P1549 Boost Pressure Contr.Valve Short to Ground
17958 P1550 Charge Pressure Deviation
17959 P1551 Barometric Pressure Sensor Circ. Short to B+
17960 P1552 Barometric Pressure Sensor Circ. Open/Short to Ground
17961 P1553 Barometric/manifold pressure signal ratio out of range
17962 P1554 Idle Speed Contr.Throttle Pos. Basic Setting Conditions not met
17963 P1555 Charge Pressure Upper Limit exceeded
17964 P1556 Charge Pressure Contr. Negative Deviation
17965 P1557 Charge Pressure Contr. Positive Deviation
17966 P1558 Throttle Actuator Electrical Malfunction
17967 P1559 Idle Speed Contr.Throttle Pos. Adaptation Malfunction
17968 P1560 Maximum Engine Speed Exceeded
17969 P1561 Quantity Adjuster Deviation
17970 P1562 Quantity Adjuster Upper Limit Attained
17971 P1563 Quantity Adjuster Lower Limit Attained
17972 P1564 Idle Speed Contr.Throttle Pos. Low Voltage During Adaptation
17973 P1565 Idle Speed Control Throttle Position lower limit not attained
17974 P1566 Load signal from A/C compressor range/performance
17975 P1567 Load signal from A/C compressor no signal
17976 P1568 Idle Speed Contr.Throttle Pos. mechanical Malfunction
17977 P1569 Cruise control switch Incorrect signal
17978 P1570 Contr.Module Locked
17979 P1571 Left Eng. Mount Solenoid Valve Short to B+
17980 P1572 Left Eng. Mount Solenoid Valve Short to ground
17981 P1573 Left Eng. Mount Solenoid Valve Open circuit
17982 P1574 Left Eng. Mount Solenoid Valve Electrical fault in circuit
17983 P1575 Right Eng. Mount Solenoid Valve Short to B+
17984 P1576 Right Eng. Mount Solenoid Valve Short to ground
17985 P1577 Right Eng. Mount Solenoid Valve Open circuit
17986 P1578 Right Eng. Mount Solenoid Valve Electrical fault in circuit
17987 P1579 Idle Speed Contr.Throttle Pos. Adaptation not started
17988 P1580 Throttle Actuator B1 Malfunction
17989 P1581 Idle Speed Contr.Throttle Pos. Basic Setting Not Carried Out
17990 P1582 Idle Adaptation at Limit
17991 P1583 Transmission mount valves Short to B+
17992 P1584 Transmission mount valves Short to ground
17993 P1585 Transmission mount valves Open circuit
17994 P1586 Engine mount solenoid valves Short to B+
17995 P1587 Engine mount solenoid valves Short to ground
17996 P1588 Engine mount solenoid valves Open circuit
18008 P1600 Power Supply (B+) Terminal 15 Low Voltage
18010 P1602 Power Supply (B+) Terminal 30 Low Voltage
18011 P1603 Internal Control Module Malfunction
18012 P1604 Internal Control Module Driver Error
18013 P1605 Rough Road/Acceleration Sensor Electrical Malfunction
18014 P1606 Rough Road Spec Engine Torque ABS-ECU Electrical Malfunction
18015 P1607 Vehicle speed signal Error message from instrument cluster
18016 P1608 Steering angle signal Error message from steering angle sensor
18017 P1609 Crash shut-down activated
18019 P1611 MIL Call-up Circ./Transm.Contr.Module Short to Ground
18020 P1612 Electronic Control Module Incorrect Coding
18021 P1613 MIL Call-up Circ Open/Short to B+
18022 P1614 MIL Call-up Circ./Transm.Contr.Module Range/Performance
18023 P1615 Engine Oil Temperature Sensor Circuit range/performance
18024 P1616 Glow Plug/Heater Indicator Circ. Short to B+
18025 P1617 Glow Plug/Heater Indicator Circ. Open/Short to Ground
18026 P1618 Glow Plug/Heater Relay Circ. Short to B+
18027 P1619 Glow Plug/Heater Relay Circ. Open/Short to Ground
18028 P1620 Engine coolant temperature signal open/short to B+
18029 P1621 Engine coolant temperature signal short to ground
18030 P1622 Engine coolant temperature signal range/performance
18031 P1623 Data Bus Powertrain No Communication
18032 P1624 MIL Request Sign.active
18033 P1625 Data-Bus Powertrain Unplausible Message from Transm.Contr.
18034 P1626 Data-Bus Powertrain Missing Message from Transm.Contr.
18035 P1627 Data-Bus Powertrain missing message from fuel injection pump
18036 P1628 Data-Bus Powertrain missing message from steering sensor
18037 P1629 Data-Bus Powertrain missing message from distance control
18038 P1630 Accelera.Pedal Pos.Sensor 1 Signal too Low
18039 P1631 Accelera.Pedal Pos.Sensor 1 Signal too High
18040 P1632 Accelera.Pedal Pos.Sensor 1 Power Supply Malfunction
18041 P1633 Accelera.Pedal Pos.Sensor 2 Signal too Low
18042 P1634 Accelera.Pedal Pos.Sensor 2 Signal too High
18043 P1635 Data Bus Powertrain missing message f.air condition control
18044 P1636 Data Bus Powertrain missing message from Airbag control
18045 P1637 Data Bus Powertrain missing message f.central electr.control
18046 P1638 Data Bus Powertrain missing message from clutch control
18047 P1639 Accelera.Pedal Pos.Sensor 1+2 Range/Performance
18048 P1640 Internal Contr.Module (EEPROM) Error
18049 P1641 Please check DTC Memory of Air Condition ECU
18050 P1642 Please check DTC Memory of Airbag ECU
18051 P1643 Please check DTC Memory of central electric ECU
18052 P1644 Please check DTC Memory of clutch ECU
18053 P1645 Data Bus Powertrain missing message f.all wheel drive contr.
18054 P1646 Please Check DTC Memory of all wheel drive ECU
18055 P1647 Please check coding of ECUs in Data Bus Powertrain
18056 P1648 Data Bus Powertrain Malfunction
18057 P1649 Data Bus Powertrain Missing message from ABS Control Module
18058 P1650 Data Bus Powertrain Missing message fr.instrument panel ECU
18059 P1651 Data Bus Powertrain missing messages
18060 P1652 Please check DTC Memory of transmission ECU
18061 P1653 Please check DTC Memory of ABS Control Module
18062 P1654 Please check DTC Memory of control panel ECU
18063 P1655 Please check DTC Memory of ADR Control Module
18064 P1656 A/C clutch relay circuit short to ground
18065 P1657 A/C clutch relay circuit short to B+
18066 P1658 Data Bus Powertrain Incorrect signal from ADR Control Module
18084 P1676 Drive by Wire-MIL Circ. Electrical Malfunction
18085 P1677 Drive by Wire-MIL Circ. Short to B+
18086 P1678 Drive by Wire-MIL Circ. Short to Ground
18087 P1679 Drive by Wire-MIL Circ. Open
18089 P1681 Contr.Unit Programming, Programming not Finished
18092 P1684 Contr.Unit Programming Communication Error
18094 P1686 Contr.Unit Error Programming Error
18098 P1690 Malfunction Indication Light Malfunction
18099 P1691 Malfunction Indication Light Open
18100 P1692 Malfunction Indication Light Short to Ground
18101 P1693 Malfunction Indication Light Short to B+
18102 P1694 Malfunction Indication Light Open/Short to Ground
18112 P1704 Kick Down Switch Malfunction
18113 P1705 Gear/Ratio Monitoring Adaptation limit reached
18119 P1711 Wheel Speed Signal 1 Range/Performance
18124 P1716 Wheel Speed Signal 2 Range/Performance
18129 P1721 Wheel Speed Signal 3 Range/Performance
18131 P1723 Starter Interlock Circ. Open
18132 P1724 Starter Interlock Circ. Short to Ground
18134 P1726 Wheel Speed Signal 4 Range/Performance
18136 P1728 Different Wheel Speed Signals Range/Performance
18137 P1729 Starter Interlock Circ. Short to B+
18141 P1733 Tiptronic Switch Down Circ. Short to Ground
18147 P1739 Tiptronic Switch up Circ. Short to Ground
18148 P1740 Clutch temperature control
18149 P1741 Clutch pressure adaptation at limit
18150 P1742 Clutch torque adaptation at limit
18151 P1743 Clutch slip control signal too high
18152 P1744 Tiptronic Switch Recognition Circ. Short to Ground
18153 P1745 Transm.Contr.Unit Relay Short to B+
18154 P1746 Transm.Contr.Unit Relay Malfunction
18155 P1747 Transm.Contr.Unit Relay Open/Short to Ground
18156 P1748 Transm.Contr.Unit Self-Check
18157 P1749 Transm.Contr.Unit Incorrect Coded
18158 P1750 Power Supply Voltage Low Voltage
18159 P1751 Power Supply Voltage High Voltage
18160 P1752 Power Supply Malfunction
18168 P1760 Shift Lock Malfunction
18169 P1761 Shift Lock Short to Ground
18170 P1762 Shift Lock Short to B+
18171 P1763 Shift Lock Open
18172 P1764 Transmission temperature control
18173 P1765 Hydraulic Pressure Sensor 2 adaptation at limit
18174 P1766 Throttle Angle Signal Stuck Off
18175 P1767 Throttle Angle Signal Stuck On
18176 P1768 Hydraulic Pressure Sensor 2 Too High
18177 P1769 Hydraulic Pressure Sensor 2 Too Low
18178 P1770 Load Signal Range/Performance
18179 P1771 Load Signal Stuck Off
18180 P1772 Load Signal Stuck On
18181 P1773 Hydraulic Pressure Sensor 1 Too High
18182 P1774 Hydraulic Pressure Sensor 1 Too Low
18183 P1775 Hydraulic Pressure Sensor 1 adaptation at limit
18184 P1776 Hydraulic Pressure Sensor 1 range/performance
18185 P1777 Hydraulic Pressure Sensor 2 range/performance
18186 P1778 Solenoid EV7 Electrical Malfunction
18189 P1781 Engine Torque Reduction Open/Short to Ground
18190 P1782 Engine Torque Reduction Short to B+
18192 P1784 Shift up/down Wire Open/Short to Ground
18193 P1785 Shift up/down Wire Short to B+
18194 P1786 Reversing Light Circ. Open
18195 P1787 Reversing Light Circ. Short to Ground
18196 P1788 Reversing Light Circ. Short to B+
18197 P1789 Idle Speed Intervention Circ. Error Message from Engine Contr.
18198 P1790 Transmission Range Display Circ. Open
18199 P1791 Transmission Range Display Circ. Short to Ground
18200 P1792 Transmission Range Display Circ. Short to B+
18201 P1793 Output Speed Sensor 2 Circ. No Signal
18203 P1795 Vehicle Speed Signal Circ. Open
18204 P1796 Vehicle Speed Signal Circ. Short to Ground
18205 P1797 Vehicle Speed Signal Circ. Short to B+
18206 P1798 Output Speed Sensor 2 Circ. Range/Performance
18207 P1799 Output Speed Sensor 2 Circ. Rpm too High
18221 P1813 Pressure Contr.Solenoid 1 Electrical
18222 P1814 Pressure Contr.Solenoid 1 Open/Short to Ground
18223 P1815 Pressure Contr.Solenoid 1 Short to B+
18226 P1818 Pressure Contr.Solenoid 2 Electrical
18227 P1819 Pressure Contr.Solenoid 2 Open/Short to Ground
18228 P1820 Pressure Contr.Solenoid 2 Short to B+
18231 P1823 Pressure Contr.Solenoid 3 Electrical
18232 P1824 Pressure Contr.Solenoid 3 Open/Short to Ground
18233 P1825 Pressure Contr.Solenoid 3 Short to B+
18236 P1828 Pressure Contr.Solenoid 4 Electrical
18237 P1829 Pressure Contr.Solenoid 4 Open/Short to Ground
18238 P1830 Pressure Contr.Solenoid 4 Short to B+
18242 P1834 Pressure Contr.Solenoid 5 Open/Short to Ground
18243 P1835 Pressure Contr.Solenoid 5 Short to B+
18249 P1841 Engine/Transmission Control Modules Versions do not match
18250 P1842 Please check DTC Memory of instrument panel ECU
18251 P1843 Please check DTC Memory of ADR Control Module
18252 P1844 Please check DTC Memory of central electric control ECU
18255 P1847 Please check DTC Memory of brake system ECU
18256 P1848 Please check DTC Memory of engine ECU
18257 P1849 Please check DTC Memory of transmission ECU
18258 P1850 Data-Bus Powertrain Missing Message from Engine Contr.
18259 P1851 Data-Bus Powertrain Missing Message from Brake Contr.
18260 P1852 Data-Bus Powertrain Unplausible Message from Engine Contr.
18261 P1853 Data-Bus Powertrain Unplausible Message from Brake Contr.
18262 P1854 Data-Bus Powertrain Hardware Defective
18263 P1855 Data-Bus Powertrain Software version Contr.
18264 P1856 Throttle/Pedal Pos.Sensor A Circ. Error Message from Engine Contr.
18265 P1857 Load Signal Error Message from Engine Contr.
18266 P1858 Engine Speed Input Circ. Error Message from Engine Contr.
18267 P1859 Brake Switch Circ. Error Message from Engine Contr.
18268 P1860 Kick Down Switch Error Message from Engine Contr.
18269 P1861 Throttle Position (TP) sensor Error Message from ECM
18270 P1862 Data Bus Powertrain Missing message from instr. panel ECU
18271 P1863 Data Bus Powertrain Missing Message from St. Angle Sensor
18272 P1864 Data Bus Powertrain Missing message from ADR control module
18273 P1865 Data Bus Powertrain Missing message from central electronics
18274 P1866 Data Bus Powertrain Missing messages

Aftermarket suppliers of diagnostic scan tools

The following suppliers offer diagnostic scan tools that can be used to retrieve scan tool codes as listed in the table above.

Assenmacher Specialty Tools, Inc.
6440 Odell Place
Boulder, CO 80301
(800)525-2943
www.asttool.com

Baum Tools Unlimited, Inc.
PO Box 5867
Sarasota, FL 34277
(800)848-6657
www.baumtools.com

Mac Tools
4635 Hilton Corporate Drive
Columbus, OH 43232
(800)622-8655
www.mactools.com

Ross-Tech
888 Sumneytown Pike
Lansdale, PA 19446
215-361-8942
www.ross-tech.com

Snap-On Technologies, Inc.
2801 80th St.
Kenosha, WI 53141-1410
(262)656-5200
www.snapon.com

 

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Volkswagen VR-6 Engine w/ Motronic Engine Management System

Technical Manual

Service Training
Self-Study Program 402

Volkswagen of America, Inc.
Service Training
Printed in U.S.A.
Printed 12/91
Part # WSP 521-402-00

All rights reserved.  All information contained in this manual is based on the latest product information available at the time of printing.  The right is reserved to make changes at any time without notice.

INDEX

  •  Introduction
  •  Engine Specifications
  •  Overview
  •  Crankcase
  •  Cylinder Head
  •  Combustion Chamber
  •  Chain Tensioners
  •  Engine Cooling System
  •  Intake Manifold
  •  Auxiliary Drives
  •  System Overview
  •  Fuel Delivery System
  •  Fuel Injectors
  •  Fuel Tank Ventilation
  •  Carbon Canister Frequency Valve (N80)
  •  Air Mass Sensor (G70)
  •  Throttle Valve Potentiometer (G69)
  •  Engine Speed / Reference Sensor (G28)
  •  Hall Sender (G40)
  •  Knock Sensor I (G61) And Knock Sensor II (G66)
  •  Oxygen Sensor (G39)
  •  Coolant Temperature Sensor (G62)
  •  Intake Air Temperature Sensor (G42)
  •  EGR System
  •  EGR Frequency Valve (N18)
  •  EGR Temperature Sensor (G98)
  •  Crankcase Ventilation
  •  Idle Stabilizer Valve (N71)
  •  Ignition System
  •  Power Supply Components
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    Introduction

    Volkswagen has developed a new six-cylinder engine called the VR-6.  This 2.8-liter engine is unique in that the V-angle between cylinder banks is 15° rather than the 60° or 90° found in most conventional V-6 engine designs.  The engine features a cast-iron crankcase, one light alloy cross flow cylinder head with two valves per cylinder operated by chain-driven overhead camshafts.  All fuel and ignition requirements of the VR-6 engine are controlled by the Bosch Motronic M2.9 Engine Management System.  This Engine Management System features an air mass sensor, dual knock sensors for cylinder-selective ignition knock regulation, and Lambda regulation.  Exhaust gases are channeled through a 3-way catalytic converter.

    Engine Specifications

    Engine code:    AAA
    Design:         Four-stroke, internal combustion engine in "Vee"/in-line
    Displacement:   2.8 liter
    Bore diameter:  81.0 mm
    Stroke:         90.0 mm
    "Vee" angle:    15°
    Compression ratio:  10:1
    Fuel and ignition systems:  Bosch Motronic M2.9
    Emission control:       Lambda control with catalytic converter

    The name, VR-6 come from a combination of Vee and the German word Reihenmotor.  The combination of the two can be roughly translated as "in-line Vee."

    Volkswagen has designed the 15° VR-6 to take advantage of conventional in-line six-cylinder engine features (single cylinder head, narrow width and excellent balancing) with the advantages of a V-6 engine design (short overall length and compactness).  The VR-6 was specifically designed for transverse installation in front-wheel-drive vehicles.  By using the narrow 15° VR-6 engine, it was possible to install a six-cylinder engine in existing Volkswagen models.  A wider V-6 engine of conventional design would have required lengthening existing vehicles to provide enough crumple zone between the front of the vehicle and the engine, and between the engine and the passenger cell.  Using the narrow VR-6 engine will help Volkswagen meet current and future front-end crash standards.

    Overview

    The drop-forged steel, six-throw crankshaft runs in seven main bearings.  The connecting rod journals are offset 22° to one another.  Overhead camshafts (one for each bank of cylinders) operate the hydraulic valve lifters which, in turn, open and close the 39.0-mm intake valves and 34.3-mm exhaust valves.  Because of the special VR-6 cylinder arrangement with two rows of combustion chambers in the same cylinder head, the intake runners between the two cylinder banks are of varying lengths.  The difference in intake length is compensated in the overhead intake manifold.  Each runner is 420 mm long.  Exhaust gases are channeled from two 3-branch cat-iron exhaust manifolds into a sheathed Y-pipe.  From there, they are channeled into a single flow before passing over the heated Oxygen Sensor and then to the catalytic converter.  The oil pump driveshaft is driven by the intermediate shaft.  Fuel injectors of the Bosch M2.9 Engine Management System are mounted behind the bend of the intake manifolds.  Besides being the optimum location for fuel injection, this location also helps shield the injectors during a frontal impact.  The water pump housing is cast integral with the engine crankcase.  In addition to the belt-driven water pump, VR-6 engine will use an auxiliary electric pump to circulate water while the engine is running and during the cooling fan after-run cycle.  In the interest of environmental friendliness, a replaceable oil filter cartridge is used on the VR-6 engine.  The sump-mounted oil pump is driven via the intermediate shaft.  An oil pressure control valve is integrated in the pump.

    Crankcase

    The crankcase is made from Perlitic gray cast iron with micro-alloy.  Two banks of three cylinders are arranged at a 15° axial angle from the crankshaft.  The cylinder bores are 81 mm in diameter with a spacing of 65 mm between cylinders.  They are staggered along the length of the engine block to allow the engine to be shorter and more compact than conventional V-6 engines.  The centerline of the cylinders are also offset from the centerline of the crankshaft by 12.5 mm.  To accommodate the offset cylinder placement and narrow "Vee" design, the connecting rod journals are offset 22° to each other.  This also allows the use of a 120° firing interval between cylinders.  The firing order is: 1, 5, 3, 6, 2, 4

    Cylinder Head

    The aluminum cross-flow cylinder head is manufactured in a permanent mold casting.  The combustion-chamber side of the head is hardened through a separate chill casting.  Twenty stretch bolts are used to retain the cylinder head to the block.  These bolts are accessible even with the camshafts installed.  However, it is necessary to re-torque the bolts after installation.  Holes for bolts, numbers 12 and 20 are sleeved to make cylinder head installation easier.  To help optimize flow through the cylinder head, the area above the valve seats has been machined.  Valve shaft diameter has been reduced to 7.0 mm during development.  Cylinders 1, 3, and 5 have short intake runners and long exhaust runners while cylinders 2, 4, and 6 have long intake runners and short exhaust runners.  A cross-flow cylinder head has allowed the use of a single cylinder exhaust manifold rather than a manifold for each bank.

    Combustion Chamber

    The surface of the combustion side of the cylinder head is flat.  The combustion chamber is formed by the shape of the piston head.  Ten different piston designs were tested during development of the VR-6 engine.  The result of these tests was the selection of a slanted piston head within eccentric trough.  The trough is offset from the center of the piston by 4.0 mm.  Compression gap height (at TDC) is 1.5 mm.  The compression ratio is 10:1.

    Chain tensioners

    Operated by oil pressure and spring tension.  The camshafts are driven by a two-stage chain-drive system located on the flywheel side of the engine.  Chains were selected to drive the valve train in consideration of a Diesel version of the VR-6 engine.  A single chain (lower) is driven by the crankshaft which, in turn, drives an intermediate sprocket and shaft at a ratio of 3:4.  The intermediate shaft sprocket drives the camshafts via a double roller chain (upper) at a ratio of 2:3.  A double roller chain is used to drive the camshaft sprockets because it must transfer more torque than the lower chain.  The specific gear ratio selection was chosen in order to keep the camshaft sprocket size small.  This helps keep the overall engine height to a minimum.  Chain tension is maintained by two chain tensioners.  The upper chain tensioner is hydraulically operated by engine oil pressure and spring tension.  The lower chain tensioner (with mechanical lock) is operated by spring tension and lubricated with engine oil.  Chain flutter is prevented by guide rails on the slack side of both chains.

    Engine Cooling System

    The VR-6 Engine uses an impeller-type water pump driven by the poly-ribbed belt.  The pump housing itself is cast into the engine block adjacent to cylinder number 2.  In addition, an Auxiliary Electric Coolant Pump also circulates engine coolant anytime the ignition is switched on.  The Auxiliary Electric Coolant Pump also runs when the engine is switched off and the coolant temperature goes over 107° C (220° F).  It runs in conjunction with the Radiator Cooling After-run System.  Circulating the coolant during this time helps cool the engine block and prevent the possibility of air pockets forming in the cylinder head.  The thermostat housing of the cooling system also houses the temperature senders G2, and F87 for the Radiator Cooling After-run System, and temperature sender G62 for the Motronic Engine Management System.

    Intake Manifold

    Volumetric efficiency must be uniform to attain smooth engine running and optimal power output under all operating conditions.  This, in turn, requires identical flow conditions in the intake ports of all cylinders.  Since the lengths of the intake runners in the VR-6 cylinder head are not equal, it was necessary to compensate with the internal design of the intake manifold.  All air intake passages are 420 mm long.

    Auxiliary Drives

    A double-sided poly-ribbed belt drives all the auxiliary components of the VR-6 engine.  A spring-operated tensioning roller keeps the poly-ribbed belt at the proper tension.  The belt tension is released by threading a long 8 mm bolt into a threaded hole on the tensioner.

    System Overview

    The VR-6 engine will use the Motronic Engine Management System version M2.9.  All Corrados will have EGR while only California-version Passats will have EGR.

    Fuel Delivery System

    A two stage fuel pump supplies fuel through the filter to the fuel manifold and the four hole injectors.  The pump is located in the fuel tank.  The fuel manifold is located on the intake manifold.  A fuel pressure regulator is attached to the fuel manifold on the fuel return side.  The fuel pressure regulator is a diaphragm-type regulator.  Fuel pressure is regulated depending on intake manifold pressure.  As intake manifold pressure changes, the pressure regulator will increase or decrease the system fuel pressure.  This maintains constant pressure differences between the intake manifold pressure and fuel pressure.

    Two-Stage Fuel Pump

    The two-stage pump has one motor that drives two separate pumps.

    Stage One

    Fuel is drawn in through a screen at the bottom of the housing by a vane-type pump.  The vane-type pump acts as a transfer pump.  It's designed to supply fuel to the fuel accumulator which is within the pump housing.  Fuel vapors and air bubbles from fuel returning from the engine, as well as excessive fuel, is forced out of the accumulator through a fuel vent.

    Stage Two

    The gear-type pump draws fuel in from the bottom of the accumulator and through a screen.  The fuel is then forced through the pump housing by the gear pump and out the top.

    Fuel Injectors

    The injectors are supplied 12 volts by the Power Supply Relay and are grounded through the Motronic ECU.  They are opened sequentially in the cylinder firing order.  Injection quantity is determined by the injector opening time.

    Fuel Tank Ventilation

    The following inputs are used to control the fuel tank ventilation:

  •  Engine speed
  •  Engine load
  •  Engine coolant temperature
  •  Signal from throttle valve Potentiometer (G69)
  • Fuel vapors from the fuel tank are vented to the carbon canister.  When the engine is warm and above idle speed, the vapors will be drawn into the intake manifold via the carbon canister.  Depending on engine load and oxygen sensor signal, a frequency valve will regulate the quantity of vapors entering the intake manifold from the carbon canister

    Carbon Canister Frequency Valve (N80)

    The ECU determines the duty cycle of the frequency valve to regulate the flow of fuel vapors from the carbon canister to the engine.  When no current is supplied to the valve, it remains in the open position.  The valve is closed (duty cycle 100%) when the cold engine is started.

    Triggering:

    The Carbon Canister Frequency Valve (N80) begins to operate after oxygen sensor operation has begun.  Valve operation is load- and speed-dependent during driving operation.  The valve is completely open at full throttle and completely closed during deceleration fuel shut-off.

    Substitute function:

    If power to the valve is interrupted, the valve remains completely open.  This could lead to rough running at idle speed and during partial load acceleration.

    Self-diagnosis:

    The ECU recognizes open circuits and short circuits in the component.

    Air Mass Sensor (G70)

    A hot-wire air mass sensor is used to measure the airflow into the engine.  The air mass sensor is attached to the air filter housing.  The sensor housing includes a baffle grid which reduces air turbulence and pulses.  The sensor has no moving parts.  A thin, electrically-heated, platinum hot-wire in the sensor is kept 180°C (356°F) above the air temperature measured by the thin-layer platinum temperature sensor.  As airflow increases, the wires are cooled and the resistance of the sensors changes.  Current to the platinum hot-wire changes to maintain the constant temperature difference.  The resulting current change is converted to a voltage signal and is used by the Motronic ECU to calculate the volume of air taken in.  Dirt or other contamination on the platinum wire can cause inaccurate output signals.  Because of this, the platinum wire is heated to 1000° C (1832° F) for a period of one second each time the engine is switched off to burn off this dirt or contamination.  If a fault develops with the signal from the air mass sensor, the signal from the throttle potentiometer is used as a substitute in order for the car to remain derivable.

    Throttle Valve Potentiometer (G69)

    The throttle valve potentiometer is connected to the throttle valve shaft.  It informs the ECU about the power requested by the driver.  Idle and full load switched are not incorporated in the Throttle Valve Potentiometer.  Idle speed and full throttle applications are recognized by the ECU from the voltage output of the potentiometer.

    Signal application:

    Throttle Valve Potentiometer signals are used for determination of idle speed stabilization, idle air volume control, fuel after-run shut-off and fuel load enrichment.

    Substitute function:

    The ECU uses the Air Mass Sensor signal and engine speed signal as a replacement variables if the Throttle Valve Potentiometer fails.

    Self-diagnosis:

    Self-diagnosis recognizes:

  •  Short circuits to positive
  •  Short circuits to ground
  • Note: On vehicles with automatic transmission, this potentiometer is combined in a housing with the potentiometer for the transmission control.

    Engine Speed / Reference Sensor (G28)

    Engine speed and crankshaft position are registered by a single sensor located on the engine block.  The sensor reads a toothed wheel mounted on the crankshaft to read engine speed.  The toothed wheel has a two-tooth gap which is used as the measuring point for the crankshaft position.

    Signal application:

    The signal is used for registration of engine speed and, in conjunction with the signal from the Hall Sender, for recognition of ignition TDC in cylinder Number 1.

    Substitute function:

    There are no substitute functions for Speed Reference Sensor G28.

    Self-diagnosis:

    The ECU recognizes a missing signal from the Speed/Reference Sensor after cranking the engine for five seconds.  An impulse signal is recognized by self-diagnosis when the reference mark signal and Hall sender signal do not correspond.

    Hall Sender (G40)

    The Hall sender is mounted in the ignition distributor.  It is an electric control switch based on the Hall effect.  The hall sender consists of a magnetic enclosure and integrated semiconductor circuit (the Hall IC).  the IC is made of plastic to protect it from dampness, soiling and mechanical damage.  A voltage signal is generated when the trigger wheel interrupts the magnetic field created by the Hall IC.  The trigger wheel turns at camshaft speed.  This means that the Hall sender generates one voltage signal for every two crankshaft revolutions.

    Signal usage:

    The Hall Sender (G40) signal and the Engine Speed/Reference Sensor (G28) signals are used to identify cylinder Number 1 for sequential fuel injection and knock regulation.

    Substitute function:

    There is no substitute function for the Hall Sender signal.  The vehicle will start and run without this signal but the ignition timing will be retarded and there will be no sequential fuel injection.

    Self-diagnosis:

    The ECU will recognize a break in wiring or a continuously applied signal voltage (during start attempts as well).

    Knock Sensor I (G61) And Knock Sensor II (G66)

    Two knock sensors are used.  A knock sensor works like a microphone to "listen" for spark knock or detonation.  When knocking occurs, the ignition timing is retarded until the knocking is eliminated.  Since the knock limit differs from cylinder to cylinder and changes within the operating range, knock regulation is done cylinder selectively.

    Signal usage:

    Knock regulation does not occur until the engine coolant temperature of 40° C (104° F) is reached.  Knock sensor I (G61) monitors cylinders 1, 2, and 3. Knock sensor II (G66) monitors cylinders 4, 5 and 6.  With the aid of the Hall sender signal, the ECU can determine which cylinder is knocking.  The ignition angle of the knocking cylinder is retarded in steps until the knocking stops up to a maximum of 12°.  If spark knock is still detected, the ECU will retard the ignition timing 11° for all cylinders and record a fault.

    Substitute function:

    If a knock sensor fails, the ignition timing angle of its assigned cylinders is retarded.

    Self-diagnosis:

    The ECU recognized an open circuit if no signal from knock sensor I (G61) or knock sensor II (G66) is received by the ECU at an engine coolant temperature above 40° C (104° F).

    Oxygen Sensor (G39)

    The oxygen sensor (G39) is made of a ceramic material called zirconium dioxide.  The inner and outer surfaces of the ceramic material are coated with platinum.  The outer platinum surface is exposed to the exhaust gas, while the inner surface is exposed to the outside air.  The difference in the amount of oxygen contacting the inner and outer surfaces of the oxygen sensor creates a pressure differential which results in a small voltage signal in the range of 100 to 1000 mV.  The amount of voltage that is produced is determined by the fuel mixture.  The oxygen sensor (G39) is heated electrically to keep it at constant operating temperature.  The heater also ensures that the sensor comes to operating temperature quickly.  The sensor has four wires.  Two are for the heating element (ground and power).  One wire is a signal wire for the sensor and one for the ground.

    Signal usage:

    The base injection time is corrected according to the voltage signal from the oxygen sensor to maintain a fuel/air ratio of approximately 14.7:1.  This allows the three-way catalytic converter to operate at its maximum efficiency.  If the fuel mixture is lean (excess oxygen), the oxygen sensor will send a low voltage signal (about 100mV) to the ECU.  If the fuel mixture is rich (lack of oxygen), the oxygen sensor will send a voltage signal (about 900 mV) to the ECU.

    Substitute function:

    There is no substitute function for oxygen sensor (G39).  If signal fails, no oxygen sensor regulation takes place.

    Self-diagnosis:

    The ECU recognizes a fault if no reasonable signal voltage range is attained within five minutes after engine start with an engine coolant temperature over 40° C (104° F).  The ECU also recognizes a open circuit in the wiring or a short circuit to ground and short circuit to positive (sensor heating).

    Coolant Temperature Sensor (G62)

    Coolant Temperature Sensor (G62) is an NTC resistor.  It's located in the thermostat housing.  As engine coolant temperature rises, the resistance of the sensor goes down.

    Signal application:

    Coolant temperature sensor signals are required as a correction factor for determination of ignition timing, injection timing and idle speed stabilization.  In addition, these systems are activated depending on engine coolant temperature:

  •  Knock control
  •  Adaptation of idle speed volume control
  •  Oxygen sensor operation
  •  Fuel tank venting
  • Substitute function:

    A fixed value of 80° C (176° F) is stored in the memory of the ECU and used in case of a faulty coolant temperature signal.

    Self-diagnosis:

    Self-diagnosis recognizes:

  •  Short circuits to positive
  •  Short circuits to ground
  • Intake Air Temperature Sensor (G42)

    An intake air temperature sensor is located in the intake manifold on the left side.

    Signal application:

    The signal is used for idle stabilization and as a correction factor for ignition timing.

    Substitute function:

    If a failure of the Intake Air Temperature Sensor (G42) occurs, the Motronic Electronic Control Unit assumes a temperature of 20° C (68° F).  If this happens, cold start problems could occur at temperatures under 0° C (32° F).

    Self-diagnosis:

    The Motronic ECU recognizes open and short circuits to this component.

    EGR System

    All Corrados will come equipped with EGR (Exhaust Gas Recirculation).  Passats sold in California will be equipped with EGR.  The EGR system is used to reduce nitrous oxide emissions (Nox).  The system re-circulates a small portion of exhaust gas into the intake mixture.  This exhaust gas is noncombustible and takes up a small space in the intake charge.  The results is lower combustion temperatures and reduced Nox emissions.  The EGR system does not operate at idle because Nox emissions are low during this time.

    EGR Frequency Valve (N18)

    The EGR Frequency Valve (N18) is mounted on the back of the intake manifold.  A control pressure (vacuum) is formed in the frequency valve from the intake manifold pressure and atmospheric pressure (from the intake air elbow).  This pressure is applied to the EGR valve via the EGR frequency valve (N18).  The frequency valve controls the amount of vacuum supplied to the EGR valve by switching between the connection to the EGR valve and the intake air boot.  Thus, the actual amount of re-circulated exhaust gas can be determined by the ECU, depending on engine speed and load conditions.  A membrane valve limits the vacuum supplied to the frequency valve at 200 mbar.

    Self-diagnosis:

    The ECU will recognize an open circuit or short circuit in the EGR frequency valve.  If the EGR valve remains continuously open or closed because of mechanical failure, the EGR temperature sensor (G98) will signal this to the control unit.

    Triggering:

    The frequency valve (N18) ground circuit is controlled by the ECU depending on engine load and speed.

    Substitute function:

    There is no substitute function.  If current to the frequency valve (N18) is interrupted, the EGR valve will remain closed.

    EGR Temperature Sensor (G98)

    The EGR temperature sensor (G98) is located in the EGR valve exhaust gas channel.  It measures the temperature of the exhaust gas.  The sensor is an NTC resistor.  The electrical resistance of the sensor decreases as the temperature of the exhaust gas increases.

    Signal usage:

    The signal from the EGR temperature sensor (G98) is used only for the diagnosis of the EGR system and has no influence on the control.

    Substitute function:

    There is no substitute function.

    Self-diagnosis:

    The EGR system is switched on when the engine coolant temperature reaches 50° C (122° F).

    Crankcase Ventilation

    Crankcase vapors are vented from the cam cover to the intake air boot.  A heating element is used to prevent icing during cold weather.

    PIN 1 = Positive (+)
    PIN 2 - To engine ground

    Idle Stabilizer Valve (N71)

    Triggering:

    The idle stabilizer valve (N71) is actuated on the ground side by the ECU.

    Substitute function:

    When a defect in the circuit is recognized, both output stages are shut off and the valve rotates to a fixed opening cross-section.  This allows the engine to idle at a warm engine idle speed.

    Self-diagnosis:

    The ECU recognizes open and short circuits in the component.

    Ignition System

    Input Signals for Regulation of Ignition System

  •  Engine speed
  •  Engine load
  •  Signal from knock sensors
  •  Signal from throttle valve potentiometer
  •  Coolant temperature
  •  Signal from Hall sender
  • Functions of Ignition System:

  •  Ignition timing correction
  •  Dwell angle regulation
  •  Idling speed stabilization
  •  Selective cylinder knock regulation
  • The control unit uses the engine load and engine speed signals as well as the signal from the throttle valve potentiometer to calculate the ignition timing.  If signals from the knock sensors indicate knocking combustion, the control unit retards the ignition timing of the knocking cylinder by 3° to max. 12° until the knocking tendency of the concerned cylinder is reduced.  When the knocking tendency no longer exists, the ignition timing is returned to the nominal value in steps of 0.5°.  When knocking occurs, the ignition timing can be different for all cylinders because of the selective cylinder knock regulation.  Fluctuations in the idling speed range are compensated by changing the ignition timing with the help of idling speed stabilization.  The control unit receives the idling speed signal from the throttle valve potentiometer.  Dwell angle regulation guarantees the necessary charging time of the ignition coil and, therefore, ignition voltage, regardless of speed and load conditions.  Coolant temperature signals are required to correct the ignition timing of a cold engine and activate knock regulation.

    Power Supply Components

    Power for the Motronic Engine Management systems is supplied via Fuse (S18) and three relays:

  •  Fuel Pump Relay (J17)
        (Position 12)
  •  Power Supply Relay (J271)
        (Position 3)
  •  Oxygen Sensor Heater Power Supply Relay (J278)
        (above main Central Electric Panel)
  • There is no internal power stage relay in the Motronic ECU.  Wiring for the Motronic Engine Management system is routed to the engine via a single multi-pin connector.  This makes engine removal quicker and provides a test point for trouble shooting procedures.  A central ground station is located on the engine block below the intake manifold.  It provides a ground point for:

  •  ECUs
  •  Sensors for the Motronic Engine Management system (and their shielding)
  •  Output components (injectors, etc.)
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    Page Updated: 30 March 2013