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Home/Jaguar/S-type/Jaguar S-type I рестайлинг (2004-2008)/Repair manual/Engine Control Systems/Electronic Engine Controls - 2.7L Diesel: Diagnosis
Contents Section: Engine Control Systems All sections

Electronic Engine Controls - 2.7L Diesel: Diagnosis Jaguar S-type I рестайлинг

Engine Control Systems 14 illustrations ~21904 words

Inspection and verification

WARNINGDo NOT carry out any work on the fuel system with the engine running. The fuel pressure within the system can be as high as 1,650 bar (23,931 lb/in 2 ). Failure to follow this instruction may result in personal injury.
WARNINGBefore performing any work on the fuel system, allow a minimum of 30 seconds to elapse after stopping the engine to allow the fuel system pressure to drop. Failure to follow this instruction may result in personal injury.
WARNINGEye protection must be worn at all times when working on or near any fuel related components. Failure to follow this instruction may result in personal injury.
WARNINGThis procedure involves fuel handling. Be prepared for fuel spillage at all times and always observe fuel handling precautions. Failure to follow this instruction may result in personal injury.
WARNINGAfter carrying out repairs, the fuel system must be checked visually for leaks. This should be done after the engine has been run, but with the engine switched OFF . Failure to follow this instruction may result in personal injury.
WARNINGIf fuel is taken internally, DO NOT induce vomiting. Seek immediate medical attention. Failure to follow this instruction may result in personal injury.
WARNINGIf fuel contacts the eyes, flush the eyes with cold water or eyewash solution and seek medical attention. Failure to follow this instruction may result in personal injury.
WARNINGWash hands thoroughly after handling, as prolonged contact may cause irritation. Should irritation develop, seek medical attention. Failure to follow this instruction may result in personal injury.
CAUTIONBefore disconnecting any part of the system, it is imperative that all dust, dirt and debris is removed from around components to prevent ingress of foreign matter into the fuel system. Failure to follow this instruction may result in damage to the vehicle.
CAUTIONThe fuel pipes between the injectors and the rail must be discarded after each use, and new pipes installed. Failure to follow this instruction may result in damage to the vehicle.
CAUTIONIt is essential that absolute cleanliness is observed when working with these components. Always install blanking plugs to any open orifices or lines. Failure to follow this instruction may result in damage to the vehicle.
CAUTIONMake sure that the workshop area in which the vehicle is being worked on is as clean and dust-free as possible. Areas in which work on clutches, brakes or where welding or machining are carried out are not suitable in view of the risk of contamination to the fuel system. Failure to follow this instruction may result in damage to the vehicle.
CAUTIONMake sure that any protective clothing worn is clean and made from lint-free non-flocking material. Failure to follow this instruction may result in damage to the vehicle.
CAUTIONMake sure that any protective gloves worn are new and are of the non-powdered latex type. Failure to follow this instruction may result in damage to the vehicle.
CAUTIONMake sure that clean, non-plated tools are used. Clean tools using a new brush that will not lose it's bristles and fresh cleaning fluid prior to starting work on the vehicle. Failure to follow this instruction may result in damage to the vehicle.
CAUTIONUse a steel-topped work bench and cover it with clean, lint-free, non-flocking material. Failure to follow this instruction may result in damage to the vehicle.
CAUTIONWhen probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part number 3548-1358-00. Failure to follow this instruction may result in damage to the vehicle.

Note. This part contains references to Parameter Identifiers (PIDs). Where the Jaguar approved diagnostic system is not available, a scan tool may be used to access these PIDs, all of which give information, and some of which can be used to both read information and to activate components. The format of the information may vary, depending on the tool used.

Note. When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.

Note. Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

Note. If diagnostic trouble codes (DTCs) are recorded and the symptom is not present when performing the pinpoint tests, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.

  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical or electrical damage. Visual Inspection Chart Mechanical Electrical Engine oil level Cooling system coolant level Fuel contamination Fuses Wiring harness Electrical connector(s) Sensor(s) Engine control module (ECM)
  3. Verify the following systems are working correctly: Air intake system, Refer to «Intake Air Distribution and Filtering»(ref-311308-S22107067012009032500000) article. Cooling system, Refer to «Engine Cooling»(ref-311316-S31234458772009032500000) article. Charging system, Refer to «Charging System»(ref-311331-S41155564422009032500000) article. Fuel charging system, Refer to «Fuel Charging and Controls»(ref-311272-S07801639922009032500000) article. Turbocharger system, Refer to «Turbocharger»(ref-311324-S04612341742009032500000) article.
  4. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  5. If the concern is not visually evident and the Jaguar approved diagnostic system is not available, use a fault code reader to retrieve the fault codes before proceeding to the DTC index chart.
  6. Make sure that a power supply and ground to the ECM are present before carrying out diagnostic work on the engine management system.

Symptom chart

SymptomPossible sourceAction
Engine cranks, but does not startInertia fuel shutoff switch Low/Contaminated fuel Lift pump fault Blocked fuel filter FVCV blocked/contaminated FPCV blocked/contaminated High-pressure fuel pump failure Low-pressure circuit faultCheck that the inertia switch has not tripped. Check the fuel level/condition. Check the lift pump operation, Refer to Fuel Pump Module - 2.7L Diesel article. Check the fuel filter, and Refer to Fuel Filter - 2.7L Diesel article. Check the fuel volume and pressure control valves, and Refer to Fuel Charging and Controls article. Check the mechanical pump components, and Refer to Fuel Injection Pump article. Check the low-pressure circuit for leaks, etc. and Refer to Fuel Tank and Lines article.
Difficult to startLow/Contaminated fuel Lift pump fault Blocked fuel filter FVCV blocked/contaminated FPCV blocked/contaminated Low-pressure circuit faultCheck the fuel level/condition. Check the lift pump operation, Refer to Fuel Pump Module - 2.7L Diesel article. Check the fuel filter, and Refer to Fuel Filter - 2.7L Diesel article. Check the fuel volume and pressure control valves, and Refer to Fuel Charging and Controls article. Check the low-pressure circuit for leaks, etc. and Refer to Fuel Tank and Lines article.
Rough idleLow/Contaminated fuel Blocked fuel filter Low-pressure circuit faultCheck the fuel level/condition. Check the fuel filter, Refer to Fuel Filter - 2.7L Diesel article. Check the low-pressure circuit for leaks, etc. and Refer to Fuel Tank and Lines article.
Lack of power when acceleratingAir intake circuit fault Low/Contaminated fuel Catalyst blocked FVCV blocked/contaminated FPCV blocked/contaminated Low fuel pressure Low-pressure circuit fault EGR valve fault Turbocharger faultCheck the air intake circuit, Refer to Intake Air Distribution and Filtering article. Check for a blocked catalytic converter, and Refer to Exhaust System article. Check the fuel volume and pressure control valves, and Refer to Fuel Charging and Controls article. Check the fuel pressure PID, For EGR tests, and Refer to Engine Emission Control article. For turbocharger tests, and Refer to Turbocharger article.
Engine stops/stallsLow/Contaminated fuel Low-pressure circuit fault Inertia fuel shutoff (IFS) switch FVCV blocked/contaminated FPCV blocked/contaminated High-pressure leakCheck the fuel level/condition. Check the low-pressure circuit for leaks, etc, Refer to Fuel Tank and Lines article. Check the fuel volume and pressure control valves, and Refer to Fuel Charging and Controls article. Check for fuel system leaks.
Engine juddersLow/Contaminated fuel Low-pressure circuit fault FVCV blocked/contaminated FPCV blocked/contaminated Transmission or driveline concernsCheck the fuel level/condition. Check the low-pressure circuit for leaks, etc, Refer to Fuel Tank and Lines article. Check the fuel volume and pressure control valves, and Refer to Fuel Charging and Controls article. For driveline information, and Refer to Driveline System and Refer to Transmission Description and Refer to Manual Transmission and Clutch article.
Excessive fuel consumptionLow-pressure circuit fault Fuel temperature sensor leak Injector(s) failure Blocked fuel filterCheck the low-pressure circuit for leaks, etc. Check for fuel system leaks, Check for injector DTCs. Refer to Fuel Charging and Controls article.

DTC index

DTCConditionPossible sourceAction
P0001Fuel volume control valve (FVCV)FVCV circuit: high resistance FVCV circuit: short circuit to ground FVCV circuit: short circuit to power FVCV failure ECM failureFor FVCV and circuit tests, Refer to Fuel Charging and Controls article.
P0002Fuel volume control valve (FVCV)FVCV circuit: high resistance FVCV circuit: short circuit to ground FVCV circuit: short circuit to power FVCV failure ECM failureFor FVCV and circuit tests, Refer to Fuel Charging and Controls article.
P0003Fuel volume control valve (FVCV)FVCV circuit: high resistance FVCV circuit: short circuit to ground FVCV circuit: short circuit to power FVCV failure ECM failureFor FVCV and circuit tests, Refer to Fuel Charging and Controls article.
P0004Fuel volume control valve (FVCV)FVCV circuit: high resistance FVCV circuit: short circuit to ground FVCV circuit: short circuit to power FVCV failure ECM failureFor FVCV and circuit tests, Refer to Fuel Charging and Controls article.
P0045Variable geometry turbocharger actuator 1Turbocharger actuator circuit: high resistance Turbocharger actuator circuit: short circuit to ground Turbocharger actuator circuit: short circuit to power Turbocharger actuator failure ECM failureFor turbocharger and circuit tests, Refer to Turbocharger article.
P0046Variable geometry turbocharger actuator 1Turbocharger actuator circuit: high resistance Turbocharger actuator circuit: short circuit to ground Turbocharger actuator circuit: short circuit to power Turbocharger actuator failure ECM failureFor turbocharger and circuit tests, Refer to Turbocharger article.
P0047Variable geometry turbocharger actuator 1Turbocharger actuator circuit: high resistance Turbocharger actuator circuit: short circuit to ground Turbocharger actuator circuit: short circuit to power Turbocharger actuator failure ECM failureFor turbocharger and circuit tests, Refer to Turbocharger article.
P0048Variable geometry turbocharger actuator 1Turbocharger actuator circuit: high resistance Turbocharger actuator circuit: short circuit to ground Turbocharger actuator circuit: short circuit to power Turbocharger actuator failure ECM failureFor turbocharger and circuit tests, Refer to Turbocharger article.
P004AVariable geometry turbocharger actuator 2Turbocharger actuator circuit: high resistance Turbocharger actuator circuit: short circuit to ground Turbocharger actuator circuit: short circuit to power Turbocharger actuator failure ECM failureFor turbocharger and circuit tests, Refer to Turbocharger article.
P004BVariable geometry turbocharger actuator 2Turbocharger actuator circuit: high resistance Turbocharger actuator circuit: short circuit to ground Turbocharger actuator circuit: short circuit to power Turbocharger actuator failure ECM failureFor turbocharger and circuit tests, Refer to Turbocharger article.
P004CVariable geometry turbocharger actuator 2Turbocharger actuator circuit: high resistance Turbocharger actuator circuit: short circuit to ground Turbocharger actuator circuit: short circuit to power Turbocharger actuator failure ECM failureFor turbocharger and circuit tests, Refer to Turbocharger article.
P004DVariable geometry turbocharger actuator 2Turbocharger actuator circuit: high resistance Turbocharger actuator circuit: short circuit to ground Turbocharger actuator circuit: short circuit to power Turbocharger actuator failure ECM failureFor turbocharger and circuit tests, Refer to Turbocharger article.
P0069Manifold absolute pressure (MAP) sensorMAP sensor circuit: high resistance MAP sensor circuit: short circuit to ground MAP sensor circuit: short circuit to power MAP sensor failure ECM failureFor MAP sensor tests, Refer to Pinpoint Test L .
P0087Fuel rail/System pressure too lowLift pump inoperative Transfer pump efficiency lowFor lift pump tests, Refer to Fuel Charging and Controls article.
P0088Fuel rail/System pressure too highFuel pressure control valve faultFor FPCV tests, Refer to Fuel Charging and Controls article.
P0090Fuel pressure control valve (FPCV)FPCV circuit: high resistance FPCV circuit: short circuit to ground FPCV circuit: short circuit to power FPCV failure ECM failureFor FPCV tests, Refer to Fuel Charging and Controls article.
P0091Fuel pressure control valve (FPCV)FPCV circuit: high resistance FPCV circuit: short circuit to ground FPCV circuit: short circuit to power FPCV failure ECM failureFor FPCV tests, Refer to Fuel Charging and Controls article.
P0092Fuel pressure control valve (FPCV)FPCV circuit: high resistance FPCV circuit: short circuit to ground FPCV circuit: short circuit to power FPCV failure ECM failureFor FPCV tests, Refer to Fuel Charging and Controls article.
P0095Air charge temperature (ACT) sensorACT sensor circuit: high resistance ACT sensor circuit: short circuit to ground ACT sensor circuit: short circuit to power ACT sensor failure ECM failureFor ACT sensor tests, Refer to Pinpoint Test F . and Refer to Pinpoint Test M .
P0097Air charge temperature (ACT) sensorACT sensor circuit: high resistance ACT sensor circuit: short circuit to ground ACT sensor circuit: short circuit to power ACT sensor failure ECM failureFor ACT sensor tests, Refer to Pinpoint Test F and Pinpoint Test M .
P0099Air charge temperature (ACT) sensorACT sensor circuit: high resistance ACT sensor circuit: short circuit to ground ACT sensor circuit: short circuit to power ACT sensor failure ECM failureFor ACT sensor tests, Refer to Pinpoint Test F and Pinpoint Test M .
P0100Mass air flow (MAF) sensor 1MAF circuit: high resistance MAF circuit: short circuit to ground MAF circuit: short circuit to power MAF sensor failure ECM failureFor MAF 1 tests, Refer to Pinpoint Test J .
P0104Mass air flow (MAF) sensor 1MAF circuit: high resistance MAF circuit: short circuit to ground MAF circuit: short circuit to power MAF sensor failure ECM failureFor MAF 1 tests, Refer to Pinpoint Test J .
P0105Manifold absolute pressure (MAP) sensorMAP sensor circuit: high resistance MAP sensor circuit: short circuit to ground MAP sensor circuit: short circuit to power MAP sensor failure ECM failureFor MAP sensor tests, Refer to Pinpoint Test L and Pinpoint Test R .
P0106Manifold absolute pressure (MAP) sensorMAP sensor circuit: high resistance MAP sensor circuit: short circuit to ground MAP sensor circuit: short circuit to power MAP sensor failure ECM failureFor MAP sensor tests, Refer to Pinpoint Test L and Pinpoint Test R .
P0107Manifold absolute pressure (MAP) sensorMAP sensor circuit: high resistance MAP sensor circuit: short circuit to ground MAP sensor circuit: short circuit to power MAP sensor failure ECM failureFor MAP sensor tests, Refer to Pinpoint Test L and Pinpoint Test R .
P0108Manifold absolute pressure (MAP) sensorMAP sensor circuit: high resistance MAP sensor circuit: short circuit to ground MAP sensor circuit: short circuit to power MAP sensor failure ECM failureFor MAP sensor tests, Refer to Pinpoint Test L and Pinpoint Test R .
P0109Manifold absolute pressure (MAP) sensorMAP sensor circuit: high resistance MAP sensor circuit: short circuit to ground MAP sensor circuit: short circuit to power MAP sensor failure ECM failureFor MAP sensor tests, Refer to Pinpoint Test L and Pinpoint Test R .
P010AMass air flow (MAF) sensor 2MAF circuit: high resistance MAF circuit: short circuit to ground MAF circuit: short circuit to power MAF sensor failure ECM failureFor MAF 2 tests, Refer to Pinpoint Test K .
P010EMass air flow (MAF) sensor 2MAF circuit: high resistance MAF circuit: short circuit to ground MAF circuit: short circuit to power MAF sensor failure ECM failureFor MAF 2 tests, Refer to Pinpoint Test K .
P0110Intake air temperature (IAT) sensorIAT sensor circuit: high resistance IAT sensor circuit: short circuit to ground IAT sensor circuit: short circuit to power IAT sensor failure ECM failureFor IAT sensor tests, Refer to Pinpoint Test I and Pinpoint Test M .
P0112Intake air temperature (IAT) sensorIAT sensor circuit: high resistance IAT sensor circuit: short circuit to ground IAT sensor circuit: short circuit to power IAT sensor failure ECM failureFor IAT sensor tests, Refer to Pinpoint Test I and Pinpoint Test M .
P0113Intake air temperature (IAT) sensorIAT sensor circuit: high resistance IAT sensor circuit: short circuit to ground IAT sensor circuit: short circuit to power IAT sensor failure ECM failureFor IAT sensor tests, Refer to Pinpoint Test I and Pinpoint Test M .
P0114Intake air temperature (IAT) sensorIAT sensor circuit: high resistance IAT sensor circuit: short circuit to ground IAT sensor circuit: short circuit to power IAT sensor failure ECM failureFor IAT sensor tests, Refer to Pinpoint Test I and Pinpoint Test M .
P0115Engine coolant temperature (ECT) sensorECT sensor circuit: high resistance ECT sensor circuit: short circuit to ground ECT sensor circuit: short circuit to power ECT sensor failure ECM failureFor ECT sensor and circuit tests, Refer to Pinpoint Test A .
P0116Engine coolant temperature (ECT) sensorECT sensor circuit: high resistance ECT sensor circuit: short circuit to ground ECT sensor circuit: short circuit to power ECT sensor failure ECM failureFor ECT sensor and circuit tests, Refer to Pinpoint Test A .
P0117Engine coolant temperature (ECT) sensorECT sensor circuit: high resistance ECT sensor circuit: short circuit to ground ECT sensor circuit: short circuit to power ECT sensor failure ECM failureFor ECT sensor and circuit tests, Refer to Pinpoint Test A .
P0118Engine coolant temperature (ECT) sensorECT sensor circuit: high resistance ECT sensor circuit: short circuit to ground ECT sensor circuit: short circuit to power ECT sensor failure ECM failureFor ECT sensor and circuit tests, Refer to Pinpoint Test A .
P0119Engine coolant temperature (ECT) sensorECT sensor circuit: high resistance ECT sensor circuit: short circuit to ground ECT sensor circuit: short circuit to power ECT sensor failure ECM failureFor ECT sensor and circuit tests, Refer to Pinpoint Test A .
P0180Fuel rail temperature (FRT) sensorFRT sensor circuit: high resistance FRT sensor circuit: short circuit to ground FRT sensor circuit: short circuit to power FRT sensor failure ECM failureFor FRT sensor tests, Refer to Pinpoint Test B .
P0181Fuel rail temperature (FRT) sensorFRT sensor circuit: high resistance FRT sensor circuit: short circuit to ground FRT sensor circuit: short circuit to power FRT sensor failure ECM failureFor FRT sensor tests, Refer to Pinpoint Test B .
P0182Fuel rail temperature (FRT) sensorFRT sensor circuit: high resistance FRT sensor circuit: short circuit to ground FRT sensor circuit: short circuit to power FRT sensor failure ECM failureFor FRT sensor tests, Refer to Pinpoint Test B .
P0183Fuel rail temperature (FRT) sensorFRT sensor circuit: high resistance FRT sensor circuit: short circuit to ground FRT sensor circuit: short circuit to power FRT sensor failure ECM failureFor FRT sensor tests, Refer to Pinpoint Test B .
P0184Fuel rail temperature (FRT) sensorFRT sensor circuit: high resistance FRT sensor circuit: short circuit to ground FRT sensor circuit: short circuit to power FRT sensor failure ECM failureFor FRT sensor tests, Refer to Pinpoint Test B .
P0190Fuel rail pressure (FRP) sensorFRP sensor circuit: high resistance FRP sensor circuit: short circuit to ground FRP sensor circuit: short circuit to power FRP sensor failure ECM failureFor FRP sensor tests, Refer to Fuel Charging and Controls article.
P0191Fuel rail pressure (FRP) sensorFRP sensor circuit: high resistance FRP sensor circuit: short circuit to ground FRP sensor circuit: short circuit to power FRP sensor failure ECM failureFor FRP sensor tests, Refer to Fuel Charging and Controls article.
P0192Fuel rail pressure (FRP) sensorFRP sensor circuit: high resistance FRP sensor circuit: short circuit to ground FRP sensor circuit: short circuit to power FRP sensor failure ECM failureFor FRP sensor tests, Refer to Fuel Charging and Controls article.
P0193Fuel rail pressure (FRP) sensorFRP sensor circuit: high resistance FRP sensor circuit: short circuit to ground FRP sensor circuit: short circuit to power FRP sensor failure ECM failureFor FRP sensor tests, Refer to Fuel Charging and Controls article.
P0194Fuel rail pressure (FRP) sensorFRP sensor circuit: high resistance FRP sensor circuit: short circuit to ground FRP sensor circuit: short circuit to power FRP sensor failure ECM failureFor FRP sensor tests, Refer to Fuel Charging and Controls article.
P0195Engine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .
P0196Engine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .
P0197Engine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .
P0198Engine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .
P0199Engine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .
P0201Fuel injector, cylinder 1Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0202Fuel injector, cylinder 2Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0203Fuel injector, cylinder 3Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0204Fuel injector, cylinder 4Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0205Fuel injector, cylinder 5Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0206Fuel injector, cylinder 6Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P020AFuel injector, cylinder 1Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P020BFuel injector, cylinder 2Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P020CFuel injector, cylinder 3Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P020DFuel injector, cylinder 4Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P020EFuel injector, cylinder 5Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P020FFuel injector, cylinder 6Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0219Crankshaft/Camshaft position (CKP/CMP) sensorCKP sensor circuit: high resistance CKP sensor circuit: short circuit to ground CKP sensor circuit: short circuit to power CMP sensor circuit: high resistance CMP sensor circuit: short circuit to ground CMP sensor circuit: short circuit to power CKP sensor failure CMP sensor failure ECM failureFor CKP sensor tests, Refer to Pinpoint Test N , for CMP sensor tests, Pinpoint Test O . For both sensors, Refer to Pinpoint Test P .
P0263Fuel injector, cylinder 1Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0266Fuel injector, cylinder 2Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0269Fuel injector, cylinder 3Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0272Fuel injector, cylinder 4Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0275Fuel injector, cylinder 5Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0278Fuel injector, cylinder 6Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P0326Knock sensor 1 (KS)KS circuit: high resistance KS circuit: short circuit to ground KS circuit: short circuit to power KS failure ECM failureFor KS tests, Refer to Pinpoint Test G .
P0331Knock sensor 2 (KS)KS circuit: high resistance KS circuit: short circuit to ground KS circuit: short circuit to power KS failure ECM failureFor KS tests, Refer to Pinpoint Test H .
P0335Crankshaft position (CKP) sensorCKP sensor circuit: high resistance CKP sensor circuit: short circuit to ground CKP sensor circuit: short circuit to power CKP sensor failure ECM failureFor CKP sensor tests, Refer to Pinpoint Test N .
P0336Crankshaft position (CKP) sensorCKP sensor circuit: high resistance CKP sensor circuit: short circuit to ground CKP sensor circuit: short circuit to power CKP sensor failure ECM failureFor CKP sensor tests, Refer to Pinpoint Test N .
P0337Crankshaft position (CKP) sensorCKP sensor circuit: high resistance CKP sensor circuit: short circuit to ground CKP sensor circuit: short circuit to power CKP sensor failure ECM failureFor CKP sensor tests, Refer to Pinpoint Test N .
P0339Crankshaft position (CKP) sensorCKP sensor circuit: high resistance CKP sensor circuit: short circuit to ground CKP sensor circuit: short circuit to power CKP sensor failure ECM failureFor CKP sensor tests, Refer to Pinpoint Test N .
P0340Camshaft position (CMP) sensorCMP sensor circuit: high resistance CMP sensor circuit: short circuit to ground CMP sensor circuit: short circuit to power CMP sensor failure ECM failureFor CMP sensor tests, Refer to Pinpoint Test O .
P0341Camshaft position (CMP) sensorCMP sensor circuit: high resistance CMP sensor circuit: short circuit to ground CMP sensor circuit: short circuit to power CMP sensor failure ECM failureFor CMP sensor tests, Refer to Pinpoint Test O .
P0342Camshaft position (CMP) sensorCMP sensor circuit: high resistance CMP sensor circuit: short circuit to ground CMP sensor circuit: short circuit to power CMP sensor failure ECM failureFor CMP sensor tests, Refer to Pinpoint Test O .
P120EFuel rail pressure (FRP) sensorFRP sensor circuit: high resistance FRP sensor circuit: short circuit to ground FRP sensor circuit: short circuit to power FRP sensor failure ECM failureFor FRP sensor tests, Refer to Fuel Charging and Controls article.
P1336Crankshaft/Camshaft position (CKP/CMP) sensorCKP sensor circuit: high resistance CKP sensor circuit: short circuit to ground CKP sensor circuit: short circuit to power CMP sensor circuit: high resistance CMP sensor circuit: short circuit to ground CMP sensor circuit: short circuit to power CKP sensor failure CMP sensor failure ECM failureFor CKP sensor tests, Refer to Pinpoint Test N , for CMP sensor tests, Pinpoint Test O . For both sensors, Refer to Pinpoint Test P .
P1551Fuel injector, cylinder 1Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P1552Fuel injector, cylinder 2Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P1553Fuel injector, cylinder 3Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P1554Fuel injector, cylinder 4Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P1555Fuel injector, cylinder 5Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P1556Fuel injector, cylinder 6Fuel injector circuit: high resistance Fuel injector circuit: short circuit to ground Fuel injector circuit: short circuit to power Fuel injector failure ECM failureFor fuel injector tests, Refer to Fuel Charging and Controls article.
P2122Accelerator pedal position (APP) sensor 1APP sensor circuit: high resistance APP sensor circuit: short circuit to ground APP sensor circuit: short circuit to power APP sensor failure ECM failureFor APP 1 tests, Refer to Pinpoint Test D .
P2123Accelerator pedal position (APP) sensor 1APP sensor circuit: high resistance APP sensor circuit: short circuit to ground APP sensor circuit: short circuit to power APP sensor failure ECM failureFor APP 1 tests, Refer to Pinpoint Test D .
P2127Accelerator pedal position (APP) sensor 2APP sensor circuit: high resistance APP sensor circuit: short circuit to ground APP sensor circuit: short circuit to power APP sensor failure ECM failureFor APP 2 tests, Refer to Pinpoint Test E .
P2128Accelerator pedal position (APP) sensor 2APP sensor circuit: high resistance APP sensor circuit: short circuit to ground APP sensor circuit: short circuit to power APP sensor failure ECM failureFor APP 2 tests, Refer to Pinpoint Test E .
P2138Accelerator pedal position (APP) sensorAPP1 circuit: high resistance APP1 circuit: short circuit to ground APP1 circuit: short circuit to power APP2 circuit: high resistance APP2 circuit: short circuit to ground APP2 circuit: short circuit to power APP1 failure APP2 failure ECM failureFor APP 1 tests, Refer to Pinpoint Test D . For APP 2 tests, Refer to Pinpoint Test E . For both sensors, Refer to Pinpoint Test Q .
P2141Exhaust gas recirculation throttle actuator (ETA)ETA circuit: high resistance ETA circuit: short circuit to ground ETA circuit: short circuit to power ETA failure ECM failureFor EGR tests, Refer to Engine Emission Control article.
P2142Exhaust gas recirculation throttle actuator (ETA)ETA circuit: high resistance ETA circuit: short circuit to ground ETA circuit: short circuit to power ETA failure ECM failureFor EGR tests, Refer to Engine Emission Control article.
P250CEngine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .
P250DEngine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .
P250EEngine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .
P252CEngine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .
P252DEngine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .
P252EEngine oil temperature, level and quality (EOT) sensorEOT sensor circuit: high resistance EOT sensor circuit: short circuit to ground EOT sensor circuit: short circuit to power EOT sensor failure ECM failureFor EOT sensor tests, Refer to Pinpoint Test C .

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the engine coolant temperature (ECT) sensor circuit
  2. Short circuit to POWER in the engine coolant temperature (ECT) sensor circuit
  3. Open circuit in the engine coolant temperature (ECT) sensor circuit
  4. Engine coolant temperature (ECT) sensor
  5. ECM

Engine coolant temperature sensor (ECT) sensor connector

Scheme 3

Scheme 3
Scheme 3
Engine coolant temperature sensor - signal01
Engine coolant temperature sensor - return02

Engine control module (ECM) connector

Scheme 4

Scheme 4
Scheme 4
Engine coolant temperature sensor - signalC-C2
Engine coolant temperature sensor - returnC-E2
Resistance (ohms)Temperature (degrees C)Temperature (degrees F)Volts
92502140404.8942
49605130224.8062
27695920044.6633
16031310144.4454
1234855234.3031
958510324.1368
749145413.9464
5898710503.7340
3734020683.2560
2425330862.7403
16113401042.2309
10926501221.7665
7548601401.3700
5335701581.0529
3837801760.8048
2804901940.6148
20801002120.4710
15641102300.3636
11911202480.2810
9181302660.2194

ECT sensor characteristics

Pinpoint Test A: ENGINE COOLANT TEMPERATURE (ECT) SENSOR

Pinpoint Test A

A1 CHECK THE ECT PID VALUE
  1. Please ensure the engine is cold.
  2. Key on, engine off.
  3. Access the OBDII-engine coolant temperature PID using a scan tool.
Is the ECT reading as expected for the current environmental and engine conditions?
YES Go to step 2 . → A2
NO Go to step 5 . → 5
A2 CHECK THE ECT PID VALUE DURING WARM UP
  1. Key on, engine run.
  2. Access the OBDII-engine coolant temperature PID using a scan tool.
  3. Increase the engine speed to 2,000 RPM and monitor the ECT reading until the engine is at full operating temperature.
Did the ECT reading rise smoothly to a value of between 80 and 95 degrees C (176 and 203 degrees F)?
YES No fault found.
NO Go to step 4 . → 4
A3 CHECK FOR AN INTERMITTENT FAULT CONDITIONS
Were there any sudden or unexpected changes in the PID readings?
YES KEY OFF. Go to step 4 . → A4
NO Go to step 5 . → 5
A4 CHECK THE ECT PID VALUE
  1. Key on, engine off.
  2. Access the OBDII-engine coolant temperature PID using a scan tool.
  3. Check the ECT harness wiring and connectors for loose connections and water ingress. Monitoring the temperature readings for sudden changes while handling the harness and connectors, may help in isolation of these types of fault.
Did you identify any loose connections or water ingress in the ECT harness wiring and connectors?
YES REPAIR the fault as necessary.
NO Go to step 5 . → 5
A5 CHECK THE ECT SENSOR RETURN LINE CONTINUITY
  1. Key off.
  2. ECT sensor connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine coolant temperature sensor - return - Pin 02 Negative post
Is the resistance less than 10 ohms?
YES Go to step 8 . → A8
NO Go to step 6 . → 6
A6 CHECK THE ECT SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Engine coolant temperature sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 7 . → A7
NO Go to step 14 . → 14
A7 CHECK THE ECT SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Engine coolant temperature sensor - return - Pin 02 Engine coolant temperature sensor - return - Pin C-E2
Is the resistance less than 10 ohms?
YES Suspect: - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
A8 CHECK THE ECT SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Engine coolant temperature sensor - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 9 . → A9
NO Go to step 12 . → 12
A9 CHECK THE ECT SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Engine coolant temperature sensor - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 10 . → A10
NO Go to step 15 . → 15
A10 CHECK THE ECT SIGNAL LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Engine coolant temperature sensor - signal - Pin 01 Engine coolant temperature sensor - signal - Pin C-C2
Is the resistance less than 10 ohms?
YES Go to step 11 . → A11
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
A11 CHECK THE COMPONENT RESISTANCE
  1. Measure the resistance between
  2. Engine coolant temperature sensor - signal - Pin 01 Engine coolant temperature sensor - return - Pin 02
Is the resistance between 1 Kohms - 500 Kohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - ECT connector - ECT sensor - ECM connector - ECM
NO INSTALL a new ECT sensor.
A12 CHECK THE ECT CIRCUIT(S) FOR SIGNAL AND RETURN LINES SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine coolant temperature sensor - signal - Pin 01 Engine coolant temperature sensor - return - Pin 02
Is the resistance greater than 100 Kohms?
YES Go to step 13 . → A13
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
A13 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE ECT HARNESS OR ECU
  1. Measure the resistance between
  2. Engine coolant temperature sensor - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
A14 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE ECT HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine coolant temperature sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
A15 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE ECT HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine coolant temperature sensor - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

Note

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the fuel rail temperature (FRT) sensor circuit
  2. Short circuit to POWER in the fuel rail temperature (FRT) sensor circuit
  3. Open circuit in the fuel rail temperature (FRT) sensor circuit
  4. Fuel rail temperature (FRT) sensor
  5. ECM

Fuel rail temperature. (FRT) Sensor Connector

Scheme 5

Scheme 5
Scheme 5
Fuel rail temperature sensor - signal01
Fuel rail temperature sensor - return02

Engine control module (ECM) connector

Fuel rail temperature sensor - signalC-B2
Fuel rail temperature sensor - returnC-G3
Temperature (degrees C)Temperature (degrees F)Volts
40404.9701
30224.9436
20044.8983
0324.7104
20684.3092
401043.6210
601402.7528
801761.8951
1002121.2389
1202480.7947
1302660.6362
1503020.4115

Fuel rail temperature sensor characteristics

Pinpoint Test B: FUEL RAIL TEMPERATURE (FRT) SENSOR

Pinpoint Test B

B1 CHECK THE FRT PID VALUE
  1. Please ensure the engine is cold.
  2. Key on, engine off.
  3. Access the ECM-fuel rail temperature PID using a scan tool.
B2 Is the PID reading as expected for the current environmental and engine conditions?
Is the PID reading as expected for the current environmental and engine conditions?
YES Go to step 3 . → B3
NO Go to step 8 . → 8
B3 CHECK THE FRT PID VALUE DURING WARM UP
  1. Key on, engine run.
  2. Access the ECM-fuel rail temperature and OBDII-engine coolant temperature PIDs using a scan tool.
B4 Did the FRT reading rise smoothly and by more than 10 degrees C (50 degrees F)?
  1. Increase the engine speed to 2,000 RPM and monitor the FRT reading, until the engine is at full operating temperature.
Did the FRT reading rise smoothly and by more than 10 degrees C (50 degrees F)?
YES No fault found.
NO Go to step 5 . → 5
B5 CHECK THE FRT PID VALUE
B6 Were there any sudden or unexpected changes in the FRT readings?
Were there any sudden or unexpected changes in the FRT readings?
YES KEY OFF. Go to step 7 . → B7
NO Go to step 8 . → 8
B7 CHECK FOR AN INTERMITTENT FAULT CONDITION
  1. Key on, engine off.
  2. Access the ECM-fuel rail temperature PID using a scan tool.
  3. Check the FRT harness wiring and connectors for loose connections and water ingress. Monitoring the temperature readings for sudden changes while handling the harness and connectors, may help in isolation of these types of fault.
Did you identify any loose connections or water ingress in the FRT harness wiring or connectors?
YES REPAIR the fault as necessary.
NO Go to step 8 . → 8
B8 CHECK THE FRT SENSOR RETURN LINE
  1. Key off.
  2. FRT Sensor connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Fuel rail temperature sensor - return - Pin 02 Negative post
Is the resistance less than 10 ohms?
YES Go to step 11 . → B11
NO Go to step 9 . → 9
B9 CHECK THE FRT SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Fuel rail temperature sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 10 . → B10
NO Go to step 18 . → 18
B10 CHECK THE FRT SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Fuel rail temperature sensor - return - Pin 02 Fuel rail temperature sensor - return - Pin C-G3
Is the resistance less than 10 ohms?
YES Suspect: - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
B11 CHECK FOR THE EXPECTED VOLTAGE DIFFERENTIAL BETWEEN SIGNAL AND RETURN LINES
  1. Measure the voltage between
  2. Fuel rail temperature sensor - signal - Pin 01 Fuel rail temperature sensor - return - Pin 02
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 15 . → B15
NO Go to step 12 . → 12
B12 CHECK THE FRT SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Fuel rail temperature sensor - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 13 . → B13
NO Go to step 16 . → 16
B13 CHECK THE FRT SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Fuel rail temperature sensor - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 14 . → B14
NO Go to step 19 . → 19
B14 CHECK THE FRT SIGNAL LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Fuel rail temperature sensor - signal - Pin 01 Fuel rail temperature sensor - signal - Pin C-B2
Is the resistance less than 10 ohms?
YES Suspect: - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
B15 CHECK THE COMPONENT RESISTANCE
  1. Measure the resistance between
  2. Fuel rail temperature sensor - signal - Pin 01 Fuel rail temperature sensor - return - Pin 02
Is the resistance between 1 Kohms - 500 Kohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - FRT connector - FRT sensor - ECM connector - ECM
NO INSTALL a new FRT sensor. See «Fuel Temperature Sensor»(ref-311295-S17401176802009032500000) .
B16 CHECK THE FRT CIRCUIT(S) FOR SIGNAL AND RETURN LINES SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Fuel rail temperature sensor - signal - Pin 01 Fuel rail temperature sensor - return - Pin 02
Is the resistance greater than 100 Kohms?
YES Go to step 17 . → B17
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
B17 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE FRT HARNESS OR ECU
  1. Measure the resistance between
  2. Fuel rail temperature sensor - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
B18 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE FRT HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Fuel rail temperature sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
B19 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE FRT HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Fuel rail temperature sensor - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the engine oil temperature, level, and quality sensor (EOTLQ) circuit
  2. Short circuit to POWER in the engine oil temperature, level, and quality sensor (EOTLQ) circuit
  3. Open circuit in the engine oil temperature, level, and quality sensor (EOTLQ) circuit
  4. Engine oil temperature, level, and quality sensor (EOTLQ)
  5. ECM

Engine oil temperature, level, and quality sensor. (EOTLQ) Connector

Scheme 6

Scheme 6
Scheme 6
Engine oil temperature, level, and quality sensor - signal01
Engine oil temperature, level, and quality sensor - power03
Engine oil temperature, level, and quality sensor - return02

Engine control module (ECM) connector

Engine oil temperature, level, and quality sensor - returnC-D2
Engine oil temperature, level, and quality sensor - powerC-C3
Engine oil temperature, level, and quality sensor - signalC-E1

Pinpoint Test C: ENGINE OIL TEMPERATURE (EOT) SENSOR

Pinpoint Test C

C1 CHECK THE EOTLQ PID VALUE
  1. Please ensure the engine is cold.
  2. Key on, engine off.
  3. Access the ECM-Engine oil temperature PID using a scan tool.
Is the EOTLQ reading as expected for the current environmental and engine conditions?
YES Go to step 2 . → C2
NO Go to step 5 . → 5
C2 CHECK THE EOTLQ PID VALUE
  1. Key on, engine run.
  2. Access the ECM-Engine oil temperature and OBDII-Engine coolant temperature PIDs using a scan tool.
  3. Increase the engine speed to 2000RPM and monitor the EOT reading, until the engine is at full operating temperature.
Did the EOTLQ reading rise smoothly and by more than 20 degrees C (68 degrees F)?
YES No fault found.
NO Go to step 3 . → 3
C3 CHECK THE EOTLQ PID VALUE
  1. Key off.
Were there any sudden or unexpected changes in the EOT readings?
YES Go to step 4 . → C4
NO Go to step 5 . → 5
C4 CHECK THE EOTLQ PID VALUE
  1. Key on, engine off.
  2. Access the ECM-Engine oil temperature PID using a scan tool.
  3. Check the EOTLQ harness wiring and connectors for loose connections and water ingress. Monitoring the temperature readings for sudden changes, while handling the harness and connectors, may help in isolation of these types of fault.
Did you identify any loose connections or water ingress in EOTLQ harness wiring and connectors?
YES REPAIR the fault as necessary.
NO Go to step 5 . → 5
C5 CHECK THE EOTLQ SENSOR RETURN LINE
  1. Key off.
  2. EOTLQ connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine oil temperature, level, and quality sensor - return - Pin 02 Negative post
Is the resistance less than 10 ohms?
YES Go to step 6 . → C6
NO Go to step 18 . → 18
C6 CHECK THE EOTLQ VOLTAGE
  1. Measure the voltage between
  2. Engine oil temperature, level, and quality sensor - power - Pin 03 Negative post
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 7 . → C7
NO Go to step 15 . → 15
C7 CHECK THE EOTLQ SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Engine oil temperature, level, and quality sensor - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 8 . → C8
NO Go to step 11 . → 11
C8 CHECK THE EOTLQ SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Engine oil temperature, level, and quality sensor - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 9 . → C9
NO Go to step 13 . → 13
C9 CHECK THE EOTLQ SIGNAL LINE FOR SHORT CIRCUIT TO SENSOR POWER
  1. Measure the resistance between
  2. Engine oil temperature, level, and quality sensor - signal - Pin 01 Engine oil temperature, level, and quality sensor - power - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 10 . → C10
NO Go to step 14 . → 14
C10 CHECK THE EOTLQ SIGNAL LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Engine oil temperature, level, and quality sensor - signal - Pin 01 Engine oil temperature, level, and quality sensor - signal - Pin C-E1
Is the resistance less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - EOTLQ connector - ECM connector - EOTLQ sensor - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C11 CHECK THE EOTLQ CIRCUIT(S) FOR SIGNAL AND RETURN LINES SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine oil temperature, level, and quality sensor - signal - Pin 01 Engine oil temperature, level, and quality sensor - return - Pin 02
Is the resistance greater than 100 Kohms?
YES Go to step 12 . → C12
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C12 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE EOTLQ HARNESS OR ECU
  1. Measure the resistance between
  2. Engine oil temperature, level, and quality sensor - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C13 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE EOTLQ HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine oil temperature, level, and quality sensor - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C14 CHECK WHETHER THE SHORT CIRCUIT IS IN THE EOTLQ HARNESS OR CONTROL UNIT
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine oil temperature, level, and quality sensor - signal - Pin 01 Engine oil temperature, level, and quality sensor - power - Pin 03
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C15 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the Resistance between
  2. Engine oil temperature, level, and quality sensor - power - Pin 03 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 16 . → C16
NO Go to step 21 . → 21
C16 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Engine oil temperature, level, and quality sensor - power - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 17 . → C17
NO Go to step 23 . → 23
C17 CHECK THE EOTLQ 5 VOLT SUPPLY LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Engine oil temperature, level, and quality sensor - power - Pin 03 Engine oil temperature, level, and quality sensor - power - Pin C-C3
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C18 CHECK THE EOTLQ SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Engine oil temperature, level, and quality sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 19 . → C19
NO Go to step 24 . → 24
C19 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine oil temperature, level, and quality sensor - power - Pin 03 Engine oil temperature, level, and quality sensor - return - Pin 02
Is the resistance greater than 100 Kohms?
YES Go to step 20 . → C20
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C20 CHECK THE EOTLQ SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Measure the resistance between
  2. Engine oil temperature, level, and quality sensor - return - Pin 02 Engine oil temperature, level, and quality sensor - return - Pin C-D2
Is the resistance less than 10 ohm?
YES Suspect : - ECM connector. - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C21 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine oil temperature, level, and quality sensor - power - Pin 03 Engine oil temperature, level, and quality sensor - return - Pin 02
Is the resistance greater than 100 Kohms?
YES Go to step 22 . → C22
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C22 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE EOTLQ HARNESS OR ECU
  1. Measure the resistance between
  2. Engine oil temperature, level, and quality sensor - power - Pin 03 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C23 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE EOTLQ HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine oil temperature, level, and quality sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
C24 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE EOTLQ HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Engine oil temperature, level, and quality sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the accelerator pedal position (APP) sensor 1 circuit
  2. Short circuit to POWER in the accelerator pedal position (APP) sensor 1 circuit
  3. Open circuit in the accelerator pedal position (APP) sensor 1 circuit
  4. Accelerator pedal position sensor 1
  5. ECM

Accelerator pedal position (APP) sensor connector

Scheme 7

Scheme 7
Scheme 7
Accelerator pedal position sensor 1 - signal04
Accelerator pedal position sensor 1 - power05
Accelerator pedal position sensor 1 - return03

Engine control module (ECM) connector

Accelerator pedal position sensor 1 - returnA-C1
Accelerator pedal position sensor 1 - powerA-E1
Accelerator pedal position sensor 1 - signalA-D1

Pinpoint Test D: ACCELERATOR PEDAL POSITION (APP) SENSOR 1

Pinpoint Test D

D1 CHECK THE APP1 VALUE, WITH THE ACCELERATOR PEDAL RELEASED
  1. Key on, engine off.
  2. Ensure the accelerator pedal is released.
  3. Access the ECM-Pedal position sensor 1 (voltage) PID using a scan tool.
Is the voltage between 0 volts - 1 volts?
YES Go to step 2 . → D2
NO Go to step 3 . → 3
D2 CHECK THE APP1 VALUE, WITH THE ACCELERATOR FULLY DEPRESSED
  1. Ensure the accelerator pedal is fully depressed.
  2. Access the ECM-Pedal position sensor 1 (voltage) PID using a scan tool.
Is the voltage between 2.2 volts - 2.7 volts?
YES No fault found.
NO Go to step 3 . → 3
D3 CHECK THE APP1 SENSOR RETURN LINE
  1. Key off.
  2. APP Sensor connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - return - Pin 03 Negative post
Is the resistance less than 10 ohms?
YES Go to step 4 . → D4
NO Go to step 21 . → 21
D4 CHECK THE APP1 VOLTAGE
  1. Measure the voltage between
  2. Accelerator pedal position sensor 1 - power - Pin 05 Negative post
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 5 . → D5
NO Go to step 13 . → 13
D5 CHECK THE APP1 SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - signal - Pin 04 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 6 . → D6
NO Go to step 9 . → 9
D6 CHECK THE APP1 SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - signal - Pin 04 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 7 . → D7
NO Go to step 11 . → 11
D7 CHECK FOR SHORT CIRCUIT BETWEEN THE APP1 SIGNAL AND THE POWER LINE
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - power - Pin 05
Is the resistance greater than 100 Kohms?
YES Go to step 8 . → D8
NO Go to step 12 . → 12
D8 CHECK THE APP1 SIGNAL LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - signal - Pin A-D1
Is the resistance less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - APP connector - APP sensor - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D9 CHECK THE APP1 CIRCUIT(S) FOR SIGNAL AND RETURN LINES SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the Resistance between
  5. Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 10 . → D10
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D10 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE APP1 HARNESS OR ECU
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - signal - Pin 04 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D11 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP1 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - signal - Pin 04 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D12 CHECK WHETHER SHORT CIRCUIT IS IN APP1 HARNESS OR CONTROL UNIT
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - power - Pin 05 Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - return - Pin 03
Are the resistances greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D13 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - power - Pin 05 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 14 . → D14
NO Go to step 18 . → 18
D14 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - power - Pin 05 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 15 . → D15
NO Go to step 20 . → 20
D15 CHECK THE APP1 5 VOLT SUPPLY LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 1 - power - Pin 05 Accelerator pedal position sensor 1 - power - Pin A-E1
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D16 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - power - Pin 05 Accelerator pedal position sensor 1 - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 17 . → D17
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D17 CHECK THE APP1 SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - return - Pin 03 Accelerator pedal position sensor 1 - return - Pin A-C1
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D18 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - power - Pin 05 Accelerator pedal position sensor 1 - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 19 . → D19
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D19 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE APP1 HARNESS OR ECU
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - power - Pin 05 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D20 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP1 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - power - Pin 05 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
D21 CHECK THE APP1 SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - return - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 16 . → D16
NO Go to step 22 . → 22
D22 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP1 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - return - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the accelerator pedal position (APP) sensor 2 circuit
  2. Short circuit to POWER in the accelerator pedal position (APP) sensor 2 circuit
  3. Open circuit in the accelerator pedal position (APP) sensor 2 circuit
  4. Accelerator pedal position sensor 2
  5. ECM

Accelerator pedal position (APP) sensor connector

Accelerator pedal position sensor 2 - signal01
Accelerator pedal position sensor 2 - power02
Accelerator pedal position sensor 2 - return06

Engine control module (ECM) connector

Accelerator pedal position sensor 2 - returnA-B2
Accelerator pedal position sensor 2 - powerA-D2
Accelerator pedal position sensor 2 - signalA-C2

Pinpoint Test E: ACCELERATOR PEDAL POSITION (APP) SENSOR 2

Pinpoint Test E

E1 CHECK THE APP2 VALUE, WITH THE ACCELERATOR PEDAL RELEASED
  1. Key on, engine off.
  2. Ensure the accelerator pedal is released.
  3. Access the ECM-Pedal position sensor 2 (voltage) PID using a scan tool.
Is the voltage between 3 volts - 5 volts?
YES Go to step 2 . → E2
NO Go to step 3 . → 3
E2 CHECK THE APP2 VALUE, WITH THE ACCELERATOR FULLY DEPRESSED
  1. Ensure the accelerator pedal is fully depressed.
  2. Access the ECM-Pedal position sensor 2 (voltage) PID using a scan tool.
Is the voltage between 2.2 volts - 2.7 volts?
YES No fault found.
NO Go to step 3 . → 3
E3 CHECK THE APP2 SENSOR RETURN LINE
  1. Key off.
  2. APP Sensor connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - return - Pin 06 Negative post
Is the resistance less than 10 Ohm?
YES Go to step 4 . → E4
NO Go to step 16 . → 16
E4 CHECK THE APP2 VOLTAGE
  1. Measure the voltage between
  2. Accelerator pedal position sensor 2 - power - Pin 02 Negative post
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 5 . → E5
NO Go to step 13 . → 13
E5 CHECK THE APP2 SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 6 . → E6
NO Go to step 9 . → 9
E6 CHECK THE APP2 SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 7 . → E7
NO Go to step 11 . → 11
E7 CHECK FOR SHORT CIRCUIT BETWEEN THE APP2 SIGNAL AND THE POWER LINE
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - signal - Pin 01 Accelerator pedal position sensor 2 - power - Pin 02
Is the resistance greater than 100 Kohms?
YES Go to step 8 . → E8
NO Go to step 12 . → 12
E8 CHECK THE APP2 SIGNAL LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 2 - signal - Pin 01 Accelerator pedal position sensor 2 - signal - Pin A-C2
Is the resistance less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - APP connector - APP sensor - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E9 CHECK THE APP2 CIRCUIT(S) FOR SIGNAL AND RETURN LINES SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - signal - Pin 01 Accelerator pedal position sensor 2 - return - Pin 06
Is the resistance greater than 100 Kohms?
YES Go to step 10 . → E10
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E10 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE APP2 HARNESS OR ECU
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E11 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP2 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E12 CHECK WHETHER THE SHORT CIRCUIT IS IN THE APP2 HARNESS OR CONTROL UNIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 2 - signal - Pin 01 Accelerator pedal position sensor 2 - power - Pin 02
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E13 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - power - Pin 02 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 14 . → E14
NO Go to step 19 . → 19
E14 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - power - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 15 . → E15
NO Go to step 21 . → 21
E15 CHECK THE APP2 5 VOLT SUPPLY LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 2 - power - Pin 02 Accelerator pedal position sensor 2 - power - Pin A-D2
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E16 CHECK THE APP2 SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - return - Pin 06 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 17 . → E17
NO Go to step 22 . → 22
E17 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - power - Pin 02 Accelerator pedal position sensor 2 - return - Pin 06
Is the resistance greater than 100 Kohms?
YES Go to step 18 . → E18
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E18 CHECK THE APP2 SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - return - Pin 06 Accelerator pedal position sensor 2 - return - Pin A-B2
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E19 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 2 - power - Pin 02 Accelerator pedal position sensor 2 - return - Pin 06
Is the resistance greater than 100 Kohms?
YES Go to step 20 . → E20
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E20 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE APP2 HARNESS OR ECU
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - power - Pin 02 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E21 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP2 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - power - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
E22 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP2 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - return - Pin 06 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the air charge temperature (ACT) sensor circuit
  2. Short circuit to POWER in the air charge temperature (ACT) sensor circuit
  3. Open circuit in the air charge temperature (ACT) sensor circuit
  4. Air charge temperature (ACT) sensor
  5. ECM

Air charge temperature (ACT) sensor connector

Scheme 8

Scheme 8
Scheme 8
Air charge temperature sensor - signal01
Air charge temperature sensor - return02

Engine control module (ECM) connector

Air charge temperature sensor - signalC-B1
Air charge temperature sensor - returnC-G3
Resistance (ohms)Temperature (degrees C)Temperature (degrees F)Volts
20960340404.9179
12037230224.8587
7166820044.7672
4408710144.6323
279360324.4433
1818710504.1931
1213620683.8808
828430863.5149
5774401043.1130
4103501222.6983
2967601402.2940
2182701581.9201
1628801761.5874
1233901941.3026
9491002121.0639
7351102300.8678
5781202480.7087
4591302660.5797

Air charge temperature sensor characteristics

Pinpoint Test F: AIR CHARGE TEMPERATURE (ACT) SENSOR

Pinpoint Test F

F1 CHECK THE ACT SENSOR RETURN LINE
  1. Key off.
  2. ACT connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Air charge temperature sensor - return - Pin 02 Negative post
Is the resistance less than 10 ohms?
YES Go to step 4 . → F4
NO Go to step 2 . → 2
F2 CHECK THE ACT SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Air charge temperature sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 3 . → F3
NO Go to step 11 . → 11
F3 CHECK THE ACT SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Air charge temperature sensor - return - Pin 02 Air charge temperature sensor - return - Pin C-G3
Is the resistance less than 10 ohms?
YES Suspect: - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
F4 CHECK THE ACT VOLTAGE
  1. Measure the voltage between
  2. Air charge temperature sensor - signal - Pin 01 Negative post
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 8 . → F8
NO Go to step 5 . → 5
F5 CHECK THE ACT SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Air charge temperature sensor - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 6 . → F6
NO Go to step 9 . → 9
F6 CHECK THE ACT SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Air charge temperature sensor - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 7 . → F7
NO Go to step 12 . → 12
F7 CHECK THE ACT SIGNAL LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Air charge temperature sensor - signal - Pin 01 Air charge temperature sensor - signal - Pin C-B1
Is the resistance less than 10 ohms?
YES Suspect: - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
F8 CHECK THE COMPONENT RESISTANCE
  1. Measure the resistance between
  2. Air charge temperature sensor - signal - Pin 01 Air charge temperature sensor - return - Pin 02
Is the resistance between 578 ohms - 71 Kohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - ACT connector. - ACT sensor. - ECM connector. - ECM
NO INSTALL a new ACT.
F9 CHECK THE ACT CIRCUIT(S) FOR SIGNAL AND RETURN LINES SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Air charge temperature sensor - signal - Pin 01 Air charge temperature sensor - return - Pin 02
Is the resistance greater than 100 Kohms?
YES Go to step 10 . → F10
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
F10 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE ACT HARNESS OR ECU
  1. Key on, engine off.
  2. Measure the resistance between
  3. Air charge temperature sensor - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
F11 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE ACT HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Air charge temperature sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
F12 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE ACT HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Air charge temperature sensor - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the knock sensor 1 (KS1) circuit
  2. Short circuit to POWER in the knock sensor 1 (KS1) circuit
  3. Open circuit in the knock sensor 1 (KS1) circuit
  4. Knock sensor 1 (KS1)
  5. ECM

Knock sensor 1 (KS1) connector

Scheme 9

Scheme 9
Scheme 9
Knock sensor 1 - negative02
Knock sensor 1 - positive01

Engine control module (ECM) connector

Knock sensor 1 - negativeB-D4
Knock sensor 1 - positiveB-E4

Pinpoint Test G: KNOCK SENSOR (KS) 1

Pinpoint Test G

G1 CHECK THE KS1 CIRCUIT(S) FOR SHORT CIRCUIT TO GROUND IN HARNESS
  1. Key off.
  2. KS1 connector disconnected.
  3. ECM connector disconnected.
  4. Measure the resistance between
  5. Knock sensor 1 - positive - Pin 01 Negative post Knock sensor 1 - negative - Pin 02 Negative post
Are the resistances greater than 100 Kohms?
YES Go to step 2 . → G2
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
G2 CHECK THE KS1 CIRCUIT(S) FOR SHORT CIRCUIT TO POWER
  1. Key on, engine off.
  2. Measure the resistance between
  3. Knock sensor 1 - positive - Pin 01 Positive post Knock sensor 1 - negative - Pin 02 Positive post
Are the resistances greater than 100 Kohms?
YES Go to step 3 . → G3
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
G3 CHECK WHETHER THE KS1 CIRCUIT(S) SIGNAL AND RETURN LINES ARE SHORTED TOGETHER
  1. Measure the resistance between
  2. Knock sensor 1 - positive. - Pin 1 Knock sensor 1 - negative. - Pin 2
Is the resistance greater than 100 Kohms?
YES Go to step 4 . → G4
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
G4 CHECK THE KS1 CIRCUIT(S) FOR OPEN CIRCUIT IN HARNESS
  1. Measure the resistance between
  2. Knock sensor 1 - positive - Pin 01 Knock sensor 1 - positive - Pin B-E4 Knock sensor 1 - negative - Pin 02 Knock sensor 1 - negative - Pin B-D4
Are the resistances less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - KS1 connector - KS1 sensor - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the knock sensor 2 (KS2) circuit
  2. Short circuit to POWER in the knock sensor 2 (KS2) circuit
  3. Open circuit in the knock sensor 2 (KS2) circuit
  4. Knock sensor 2 (KS2)
  5. ECM

Knock sensor 2 (KS2) Connector

Scheme 10

Scheme 10
Scheme 10
Knock sensor 2 - negative02
Knock sensor 2 - positive01

Engine control module. (ECM) Connector

Knock sensor 2 - negativeB-C4
Knock sensor 2 - positiveB-D3

Pinpoint Test H: KNOCK SENSOR (KS) 2

Pinpoint Test H

H1 CHECK THE KS2 CIRCUIT(S) FOR SHORT CIRCUIT TO GROUND IN HARNESS
  1. Key off.
  2. KS1 connector disconnected.
  3. ECM connector disconnected.
  4. Measure the resistance between
  5. Knock sensor 2 - positive - Pin 01 Negative post Knock sensor 2 - negative - Pin 02 Negative post
Are the resistances greater than 100 Kohms?
YES Go to step 2 . → H2
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
H2 CHECK THE KS2 CIRCUIT(S) FOR SHORT CIRCUIT TO POWER
  1. Key on, engine off.
  2. Measure the resistance between
  3. Knock sensor 2 - positive - Pin 01 Positive post Knock sensor 2 - negative - Pin 02 Positive post
Are the resistances greater than 100 Kohms?
YES Go to step 3 . → H3
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
H3 CHECK WHETHER THE KS2 CIRCUIT(S) SIGNAL AND RETURN LINES ARE SHORTED TOGETHER
  1. Measure the resistance between
  2. Knock sensor 2 - positive - Pin 01 Knock sensor 2 - negative - Pin 02
Is the resistance greater than 100 Kohms?
YES Go to step 4 . → H4
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
H4 CHECK THE KS2 CIRCUIT(S) FOR OPEN IN HARNESS
  1. Measure the resistance between
  2. Knock sensor 2 - positive - Pin 01 Knock sensor 2 - positive - Pin B-D3 Knock sensor 2 - negative - Pin 02 Knock sensor 2 - negative - Pin B-C4
Are the resistances less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - KS2 connector. - KS2 sensor. - ECM connector. - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

Note

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the intake air temperature (IAT) sensor circuit
  2. Short circuit to POWER in the intake air temperature (IAT) sensor circuit
  3. Open circuit in the intake air temperature (IAT) sensor circuit
  4. Mass air flow sensor 1 (MAF1)
  5. ECM

Mass air flow sensor 1 (MAF1) connector

Scheme 11

Scheme 11
Scheme 11
Intake air temperature bank 1 - signal02
Intake air temperature bank 1 - return03

Engine control module (ECM) connector

Intake air temperature bank 1 - returnC1-L4
Intake air temperature bank 1 - signalC1-F1
Mass air flow sensor - returnA1-L4
Resistance (ohms)Temperature (degreees C)Temperature (degrees F)Volts
4437340404.7844
2557230224.6373
1514120044.4166
920210144.1073
57740323.7137
371410503.2499
244820682.7518
167130862.2759
1150401041.8254
816.5501221.4497
583.1601401.1287
426.1701580.8792
315.8801760.6818
238.1901940.5319
182.81002120.4187
141.21102300.3297
110.31202480.2613
87.451302660.2095

Intake air temperature sensor characteristics

Pinpoint Test I: INTAKE AIR TEMPERATURE (IAT) SENSOR

Pinpoint Test I

I1 CHECK THE IAT PID VALUE
  1. Please ensure the engine is cold.
  2. Key on, engine off.
  3. Access the ECM-Intake air temperature PID using a scan tool.
Is the IAT reading as expected for the current environmental and engine conditions?
YES Go to step 2 . → I2
NO Go to step 5 . → 5
I2 CHECK THE IAT PID VALUE AT INCREASED RPM
  1. Key on, engine run.
  2. Access the ECM-Intake air temperature PID using a scan tool.
  3. Slowly increase the engine speed to 4,000 RPM while monitoring the IAT.
Did the IAT reading rise smoothly?
YES No fault found.
NO Go to step 3 . → 3
I3 CHECK FOR INTERMITTENT FAULT CONDITIONS
Were there any sudden or unexpected changes in the IAT readings?
YES KEY OFF. Go to step 4 . → I4
NO Go to step 5 . → 5
I4 CHECK THE IAT PID VALUE
  1. Key on, engine off.
  2. Access the ECM-Intake air temperature PID using a scan tool.
  3. Check the IAT harness wiring and connectors for loose connections and water ingress. Monitoring the temperature readings for sudden changes, while handling the harness and connectors, may help in isolation of these types of fault.
Did you identify any loose connections or water ingress in IAT harness wiring and connectors?
YES REPAIR the fault as necessary.
NO Go to step 5 . → 5
I5 CHECK THE IAT SENSOR RETURN LINE
  1. Key off.
  2. MAF1 connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Intake air temperature bank 1 - return - Pin 03 Negative post
Is the resistance less than 10 ohms?
YES Go to step 8 . → I8
NO Go to step 6 . → 6
I6 CHECK THE IAT SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Intake air temperature bank 1 - return - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 7 . → I7
NO Go to step 15 . → 15
I7 CHECK THE IAT SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Intake air temperature bank 1 - return - Pin 03 Mass air flow sensor - return - Pin A1-L4
Is the resistance less than 10 ohms?
YES Suspect: - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
I8 CHECK THE IAT VOLTAGE
  1. Measure the voltage between
  2. Intake air temperature bank 1 - signal - Pin 02 Negative post
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 12 . → I12
NO Go to step 9 . → 9
I9 CHECK THE IAT SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Intake air temperature bank 1 - signal - Pin 02 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 10 . → I10
NO Go to step 13 . → 13
I10 CHECK THE IAT SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Key on, engine off.
  2. Measure the resistance between
  3. Intake air temperature bank 1 - signal - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 11 . → I11
NO Go to step 16 . → 16
I11 CHECK THE IAT SIGNAL LINE FOR OPEN CIRCUIT
  1. Measure the resistance between
  2. Intake air temperature bank 1 - signal - Pin 02 Intake air temperature bank 1 - signal - Pin C1-F1
Is the resistance less than 10 ohms?
YES Suspect: - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
I12 CHECK THE COMPONENT RESISTANCE
  1. Measure the resistance between
  2. Intake air temperature bank 1 - signal - Pin 02 Intake air temperature bank 1 - return - Pin 03
Is the resistance between 150 ohms - 15 Kohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - MAF1 connector - MAF1 sensor - ECM connector - ECM
NO INSTALL a new MAF1. See «Mass Air Flow (MAF) Sensor»(ref-311295-S23638064872009032500000) .
I13 CHECK WHETHER THE IAT CIRCUIT(S) SIGNAL AND RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Intake air temperature bank 1 - signal - Pin 02 Intake air temperature bank 1 - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 14 . → I14
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
I14 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE IAT HARNESS OR ECU
  1. Measure the resistance between
  2. Intake air temperature bank 1 - signal - Pin 02 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
I15 CHECK WHETHER THE SHORT TO POWER IS IN THE IAT HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Intake air temperature bank 1 - return - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
I16 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE IAT HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Intake air temperature bank 1 - signal - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

Note

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the mass air flow sensor 1 (MAF1) circuit
  2. Short circuit to POWER in the mass air flow sensor 1 (MAF1) circuit
  3. Open circuit in the mass air flow sensor 1 (MAF1) circuit
  4. Mass air flow sensor 1 (MAF1)
  5. ECM

Mass air flow sensor 1 (MAF1) connector

Mass air flow sensor - signal01
Mass air flow sensor - return03
ECM relay controlled 12 volt supply04

Engine control module (ECM) connector

Mass air flow sensor - signalA1-F4
Mass air flow sensor - returnA1-L4

Pinpoint Test J: MASS AIR FLOW METER (MAF) 1

Pinpoint Test J

J1 CHECK THE MAF1 PID VALUE
  1. Key on, engine run.
  2. Access the ECM-Mass air flow sensor A signal frequency PID using a scan tool.
Is the Hot$MAF between 4 g/sec - 18 g/sec?
YES No fault found.
NO Go to step 2 . → 2
J2 CHECK THE MAF1 PID VALUE
  1. Access the ECM-Mass air flow sensor A signal frequency PID using a scan tool.
Is the Hot$MAF less than 4 g/sec?
YES Go to step 4 . → J4
NO Go to step 3 . → 3
J3 CHECK FOR SECONDARY AIR LEAKS
  1. Key off.
  2. Please check for air leaks between the turbo and the MAF1. Refer to «Intake Air Distribution and Filtering»(ref-311308-S22107067012009032500000) article.
Are there any air leaks?
YES REPAIR the fault as necessary
NO Go to step 5 . → 5
J4 CHECK FOR OIL INGESTION
  1. Key off.
  2. Please check for oil ingestion through the engine manifold.
Is there any oil ingestion?
YES Repair / replace the MAF1.Check/rectify any external oil leaks.
NO Go to step 5 . → 5
J5 CHECK THE COMPONENT RESISTANCE
  1. MAF1 connector disconnected.
  2. Measure the resistance between
  3. ECM relay controlled 12 volt supply - Pin 04 Mass air flow sensor - return - Pin 03
Is the resistance between 120 Kohms - 130 Kohms?
YES Go to step 6 . → J6
NO INSTALL a new MAF sensor. See «Mass Air Flow (MAF) Sensor»(ref-311295-S23638064872009032500000) .
J6 CHECK THE MAF1 CIRCUIT VOLTAGE
  1. Key on, engine off.
  2. Measure the voltage between
  3. ECM relay controlled 12 volt supply - Pin 04 Negative post
Is the voltage between 9 volts - 15 volts?
YES Go to step 7 . → J7
NO No power to the MAF circuit. Check and repair the circuit as necessary.
J7 CHECK THE MAF1 CIRCUIT FOR SHORT CIRCUIT TO GROUND IN THE HARNESS
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Mass air flow sensor - return - Pin 03 Negative post Mass air flow sensor - signal - Pin 01 Negative post
Are the resistances greater than 100 Kohms?
YES Go to step 8 . → J8
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
J8 CHECK THE MAF1 CIRCUIT FOR SHORT CIRCUIT TO POWER IN HARNESS
  1. Measure the resistance between
  2. Mass air flow sensor - return - Pin 03 Positive post Mass air flow sensor - signal - Pin 01 Positive post
Are the resistances greater than 100 Kohms?
YES Go to step 9 . → J9
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
J9 CHECK FOR SHORT CIRCUIT BETWEEN SENSOR LINES
  1. Measure the resistance between
  2. Mass air flow sensor - signal - Pin 01 Mass air flow sensor - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 10 . → J10
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
J10 CHECK MAF1 CIRCUIT FOR AN OPEN CIRCUIT IN THE HARNESS
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Mass air flow sensor - return - Pin 03 Mass air flow sensor - return - Pin A1-L4 Mass air flow sensor - signal - Pin 01 Mass air flow sensor - signal - Pin A1-F4
Are the resistances less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - MAF connector - ECM connector - MAF - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the mass air flow sensor 2 (MAF2) circuit
  2. Short circuit to POWER in the mass air flow sensor 2 (MAF2) circuit
  3. Open circuit in the mass air flow sensor 2 (MAF2) circuit
  4. Mass air flow sensor 2 (MAF2)
  5. ECM

Mass air flow sensor 2 (MAF2) connector

Mass air flow sensor 2 - signal01
Mass air flow sensor 2 - return03
ECM relay controlled 12 volt supply04

Engine control module (ECM) connector

Mass air flow sensor - returnA1-L4
Mass air flow sensor 2 - signalA1-G4

Pinpoint Test K: MASS AIR FLOW METER (MAF) 2

Pinpoint Test K

K1 CHECK THE MAF2 PID VALUE
  1. Key on, engine run.
  2. Access the ECM-Mass air flow sensor B signal frequency PID using a scan tool.
Is the Hot$MAF between 4 g/sec - 18 g/sec?
YES No fault found.
NO Go to step 2 . → 2
K2 CHECK THE MAF2 PID VALUE
  1. Access the ECM-Mass air flow sensor B signal frequency PID using a scan tool.
Is the Hot$MAF less than 4 g/sec?
YES Go to step 4 . → K4
NO Go to step 3 . → 3
K3 CHECK FOR SECONDARY AIR LEAKS
  1. Key off.
  2. Please check for air leaks between the turbo and the MAF2. Refer to «Intake Air Distribution and Filtering»(ref-311308-S22107067012009032500000) article.
Are there any air leaks?
YES REPAIR the fault as necessary.
NO Go to step 5 . → 5
K4 CHECK FOR OIL INGESTION
  1. Key off.
  2. Please check for oil ingestion via the engine manifold.
Is there any oil ingestion?
YES Repair / replace the MAF2.Check/rectify any external oil leaks.
NO Go to step 5 . → 5
K5 CHECK THE COMPONENT RESISTANCE
  1. MAF2 connector disconnected.
  2. Measure the resistance between
  3. ECM relay controlled 12 volt supply - Pin 04 Mass air flow sensor 2 - return - Pin 03
Is the resistance between 120 Kohms - 130 Kohms?
YES Go to step 6 . → K6
NO INSTALL a new MAF sensor. See «Mass Air Flow (MAF) Sensor»(ref-311295-S23638064872009032500000) .
K6 CHECK THE MAF2 CIRCUIT VOLTAGE
  1. Key on, engine off.
  2. Measure the voltage between
  3. ECM relay controlled 12 volt supply - Pin 04 Negative post
Is the voltage between 9 volts - 15 volts?
YES Go to step 7 . → K7
NO No power to the MAF circuit. Check and repair the circuit as necessary.
K7 CHECK THE MAF2 CIRCUIT FOR SHORT CIRCUIT TO GROUND IN THE HARNESS
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Mass air flow sensor 2 - return - Pin 03 Negative post Mass air flow sensor 2 - signal - Pin 01 Negative post
Are the resistances greater than 100 Kohms?
YES Go to step 8 . → K8
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
K8 CHECK THE MAF2 CIRCUIT FOR SHORT CIRCUIT TO POWER IN THE HARNESS
  1. Measure the resistance between
  2. Mass air flow sensor 2 - return - Pin 03 Positive post Mass air flow sensor 2 - signal - Pin 01 Positive post
Are the resistances greater than 100 Kohms?
YES Go to step 9 . → K9
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
K9 CHECK FOR SHORT CIRCUIT BETWEEN SENSOR LINES
  1. Measure the resistance between
  2. Mass air flow sensor 2 - signal - Pin 01 Mass air flow sensor 2 - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 10 . → K10
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
K10 CHECK MAF2 CIRCUIT FOR AN OPEN CIRCUIT IN THE HARNESS
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Mass air flow sensor 2 - return - Pin 03 Mass air flow sensor 2 - signal - Pin A1-G4 Mass air flow sensor 2 - signal - Pin 01 Mass air flow sensor 2 - signal - Pin A1-G4
Are the resistances less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - MAF connector. - ECM connector. - MAF - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the manifold absolute pressure (MAP) sensor circuit
  2. Short circuit to POWER in the manifold absolute pressure (MAP) sensor circuit
  3. Open circuit in the manifold absolute pressure (MAP) sensor circuit
  4. Manifold absolute pressure (MAP) sensor
  5. ECM

Manifold absolute pressure (MAP) sensor connector

Scheme 12

Scheme 12
Scheme 12
Manifold absolute pressure sensor - signal02
Manifold absolute pressure sensor - power01
Manifold absolute pressure sensor - return03

Engine control module (ECM) connector

Manifold absolute pressure sensor - returnC-E2
Manifold absolute pressure sensor - powerC-D1
Manifold absolute pressure sensor - signalC-C1

Pinpoint Test L: MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR

Pinpoint Test L

L1 CHECK THE MAP SENSOR RETURN LINE
  1. Key off.
  2. MAP Sensor connector disconnected.
  3. Measure the resistance between
  4. Manifold absolute pressure sensor - return - Pin 03 Negative post
Is the resistance less than 10 ohms?
YES Go to step 2 . → L2
NO Go to step 13 . → 13
L2 CHECK THE MAP VOLTAGE
  1. Key on, engine off.
  2. Measure the voltage between
  3. Manifold absolute pressure sensor - power - Pin 01 Negative post
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 3 . → L3
NO Go to step 10 . → 10
L3 CHECK THE MAP SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - signal - Pin 02 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 4 . → L4
NO Go to step 7 . → 7
L4 CHECK THE MAP SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Key on, engine off.
  2. Measure the resistance between
  3. Manifold absolute pressure sensor - signal - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 5 . → L5
NO Go to step 8 . → 8
L5 CHECK THE MAP SIGNAL LINE FOR SHORT CIRCUIT TO SIGNAL RETURN AND SENSOR POWER
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - signal - Pin 02 Manifold absolute pressure sensor - power - Pin 01 Manifold absolute pressure sensor - signal - Pin 02 Manifold absolute pressure sensor - return - Pin 03
Are the resistances greater than 100 Kohms?
YES Go to step 6 . → L6
NO Go to step 9 . → 9
L6 CHECK THE MAP SIGNAL LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Manifold absolute pressure sensor - signal - Pin 02 Manifold absolute pressure sensor - signal - Pin C-C1
Is the resistance less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - MAP connector - MAP - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
L7 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE MAP HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - signal - Pin 02 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
L8 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE TMAP HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - signal - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
L9 CHECK WHETHER THE SHORT CIRCUIT IS IN THE MAP HARNESS OR CONTROL UNIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Manifold absolute pressure sensor - signal - Pin 02 Manifold absolute pressure sensor - power - Pin 01 Manifold absolute pressure sensor - signal - Pin 02 Manifold absolute pressure sensor - return - Pin 03
Are the resistances greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
L10 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - power - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 11 . → L11
NO Go to step 16 . → 16
L11 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - power - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 12 . → L12
NO Go to step 17 . → 17
L12 CHECK THE MAP 5 VOLT SUPPLY LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Manifold absolute pressure sensor - power - Pin 01 Manifold absolute pressure sensor - power - Pin C-D1
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector. - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
L13 CHECK THE MAP SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - return - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 14 . → L14
NO Go to step 18 . → 18
L14 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - power - Pin 01 Manifold absolute pressure sensor - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 15 . → L15
NO Go to step 19 . → 19
L15 CHECK THE MAP SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - return - Pin 03 Manifold absolute pressure sensor - return - Pin C-E2
Is the resistance less than 10 ohms?
YES Suspect : - MAP connector - ECM connector - MAP - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
L16 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE MAP HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - power - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
L17 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE MAP HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - power - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
L18 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE MAP HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - return - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
L19 CHECK WHETHER THE SHORT CIRCUIT IS IN THE MAP HARNESS OR CONTROL UNIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Manifold absolute pressure sensor - power - Pin 01 Manifold absolute pressure sensor - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

Note

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the air charge temperature (ACT) sensor circuit
  2. Short circuit to POWER in the air charge temperature (ACT) sensor circuit
  3. Open circuit in the air charge temperature (ACT) sensor circuit
  4. Air charge temperature (ACT) sensor
  5. ECM

Air charge temperature (ACT) connector

Air charge temperature sensor - signal01
Air charge temperature sensor - return02

Engine control module (ECM) connector

Mass air flow sensor - returnA1-L4
Intake air temperature bank 1 - return.C1-L4
Intake air temperature bank 1 - signalC1-F1
Air charge temperature sensor - signalC-B1
Air charge temperature sensor - returnC-G3

Pinpoint Test M: INTAKE AIR TEMPERATURE (IAT) AND CHARGE AIR TEMPERATURE (ACT) SENSORS

Pinpoint Test M

M1 CHECK THE IAT PID VALUE
  1. Please ensure the engine is cold.
  2. Key on, engine off.
  3. Access the ECM-Boost air temperature PID using a scan tool.
Is the IAT reading as expected for the current environmental and engine conditions?
YES Go to step 2 . → M2
NO Go to step 5 . → 5
M2 CHECK THE IAT PID VALUE
  1. Key on, engine run.
  2. Increase the engine speed to 4,000 RPM.
  3. Access the ECM-Boost air temperature PID using a scan tool.
Did the IAT reading rise smoothly?
YES No fault found.
NO Go to step 3 . → 3
M3 CHECK THE IAT PID VALUE
  1. Key off.
Were there any sudden or unexpected changes in the IAT readings?
YES Go to step 4 . → M4
NO Go to step 5 . → 5
M4 CHECK THE IAT PID VALUE
  1. Key on, engine off.
  2. Access the ECM-Boost air temperature PID using a scan tool.
  3. Check the IAT harness wiring and connectors for loose connections and water ingress.
Does the IAT reading change while handling harness / connector?
YES REPAIR the fault as necessary.
NO Go to step 5 . → 5
M5 CHECK THE ACT SENSOR RETURN LINE
  1. Key off.
  2. ACT connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Air charge temperature sensor - return - Pin 02 Negative post
Is the resistance less than 10 ohms?
YES Go to step 8 . → M8
NO Go to step 6 . → 6
M6 CHECK THE ACT SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Air charge temperature sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 7 . → M7
NO Go to step 15 . → 15
M7 CHECK THE ACT SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ACT connector disconnected.
  3. Measure the resistance between
  4. Air charge temperature sensor - return - Pin 02 Air charge temperature sensor - return - Pin C-G3
Is the resistance less than 10 ohms?
YES Suspect: - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
M8 CHECK THE ACT VOLTAGE
  1. Measure the voltage between
  2. Air charge temperature sensor - signal - Pin 01 Negative post
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 12 . → M12
NO Go to step 9 . → 9
M9 CHECK THE ACT SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Air charge temperature sensor - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 10 . → M10
NO Go to step 13 . → 13
M10 CHECK THE ACT SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Key on, engine off.
  2. Measure the resistance between
  3. Air charge temperature sensor - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 11 . → M11
NO Go to step 16 . → 16
M11 CHECK THE ACT SIGNAL LINE FOR OPEN CIRCUIT
  1. Measure the resistance between
  2. Air charge temperature sensor - signal - Pin 01 Air charge temperature sensor - signal - Pin C-B1
Is the resistance less than 10 ohms?
YES Suspect: - ECM connector. - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
M12 CHECK THE COMPONENT RESISTANCE
  1. Measure the resistance between
  2. Air charge temperature sensor - signal - Pin 01 Air charge temperature sensor - return - Pin 02
Is the resistance between 1 Kohms - 100 Kohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - ACT connector - ECM connector - ECM
NO INSTALL a new ACT sensor.
M13 CHECK THE ACT CIRCUIT(S) FOR SIGNAL AND RETURN LINES SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Air charge temperature sensor - signal - Pin 01 Air charge temperature sensor - return - Pin 02
Is the resistance greater than 100 Kohms?
YES Go to step 14 . → M14
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
M14 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE ACT HARNESS OR ECU
  1. Measure the resistance between
  2. Air charge temperature sensor - signal - Pin 01 Negative post.
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
M15 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE ACT HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Air charge temperature sensor - return - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
M16 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE ACT HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Air charge temperature sensor - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the crankshaft position (CKP) sensor circuit
  2. Short circuit to POWER in the crankshaft position (CKP) sensor circuit
  3. Open circuit in the crankshaft position (CKP) sensor circuit
  4. Crankshaft position (CKP) sensor
  5. ECM

Crankshaft position (CKP) sensor connector

Scheme 13

Scheme 13
Scheme 13
Crankshaft position sensor - signal02
Crankshaft position sensor - positive01
Crankshaft position sensor - negative03

Engine control module (ECM) connector

Crankshaft position sensor - signalC-F1
Crankshaft position sensor - positiveC-G1
Crankshaft position sensor - negativeC-G2

Pinpoint Test N: CRANKSHAFT POSITION (CKP) SENSOR

Pinpoint Test N

N1 CHECK THE CKP FOR SHORT CIRCUIT TO GROUND
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Crankshaft position sensor - negative - Pin C-G2 Negative post Crankshaft position sensor - positive - Pin C-G1 Negative post Crankshaft position sensor - signal - Pin C-F1 Negative post
Are the resistances greater than 100 Kohms?
YES Go to step 2 . → N2
NO REPAIR the short circuit to GROUND in the CKP harness or component.
N2 CHECK THE CKP CIRCUIT FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Crankshaft position sensor - negative - Pin C-G2 Positive post Crankshaft position sensor - positive - Pin C-G1 Positive post Crankshaft position sensor - signal - Pin C-F1 Positive post
Are the resistances greater than 100 Kohms?
YES Go to step 3 . → N3
NO REPAIR the short circuit to POWER in the CKP harness or component.
N3 CHECK THE CKP CIRCUIT RESISTANCE
  1. Measure the resistance between
  2. Crankshaft position sensor - negative - Pin C-G2 Crankshaft position sensor - signal - Pin C-F1
Is the resistance between 100 Kohms - 120 Kohms?
YES Go to step 4 . → N4
NO REPAIR the out of limits resistance in the CKP harness or component. This may be due to a short or open circuit, depending on the result of the last measurement.
N4 CHECK THE CKP CIRCUIT RESISTANCE
  1. Measure the resistance between
  2. Crankshaft position sensor - positive - Pin C-G1 Crankshaft position sensor - signal - Pin C-F1 Crankshaft position sensor - positive - Pin C-G1 Crankshaft position sensor - negative - Pin C-G2
Are the resistances greater than 100 Kohms?
YES No fault found in the tests. However the following may be suspect: - Open circuit in sensor power line - CKP connector - CKP sensor - Crank target wheel - ECM connector - ECM
NO REPAIR the out of limits resistance in the CKP harness or component. This may be due to a short or open circuit, depending on the result of the last measurement.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the camshaft position (CMP) sensor circuit
  2. Short circuit to POWER in the camshaft position (CMP) sensor circuit
  3. Open circuit in the camshaft position (CMP) sensor circuit
  4. Camshaft position sensor
  5. ECM

Engine control module (ECM) connector

Camshaft position sensor - returnC-H3
Camshaft position sensor - powerC-H4
Camshaft position sensor - signalC-G4

Camshaft position sensor bank 1 (CMP1) connector

Scheme 14

Scheme 14
Scheme 14
Camshaft position sensor - signal01
Camshaft position sensor - return02
Camshaft position sensor - power03

Pinpoint Test O: CAMSHAFT POSITION (CMP) SENSOR

Pinpoint Test O

O1 CHECK THE CMP FOR SHORT CIRCUIT TO GROUND
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Camshaft position sensor - signal - Pin C-G4 Negative post Camshaft position sensor - power - Pin C-H4 Negative post Camshaft position sensor - return - Pin C-H3 Negative post
Are the resistances greater than 100 Kohms?
YES Go to step 2 . → O2
NO REPAIR the short circuit to GROUND in the CMP harness or component.
O2 CHECK THE CMP CIRCUIT FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Camshaft position sensor - signal - Pin C-G4 Positive post Camshaft position sensor - power - Pin C-H4 Positive post Camshaft position sensor - return - Pin C-H3 Positive post
Are the resistances greater than 100 Kohms?
YES Go to step 3 . → O3
NO REPAIR the short circuit to POWER in the CMP harness or component.
O3 CHECK THE CMP CIRCUIT RESISTANCE
  1. Measure the resistance between
  2. Camshaft position sensor - signal - Pin C-G4 Camshaft position sensor - return - Pin C-H3
Is the resistance between 100 Kohms - 120 Kohms?
YES Go to step 4 . → O4
NO REPAIR the out of limits resistance in the CMP harness or component. This may be due to a short or open circuit, depending on the result of the last measurement.
O4 CHECK THE CMP CIRCUIT RESISTANCE
  1. Measure the resistance between
  2. Camshaft position sensor - power - Pin C-H4 Camshaft position sensor - signal - Pin C-G4 Camshaft position sensor - power - Pin C-H4 Camshaft position sensor 2 - return
Are the resistances greater than 100 Kohms?
YES No fault found in the tests. However the following may be suspect: - Open circuit in sensor power line - CMP connector - CMP sensor - ECM connector - ECM
NO REPAIR the out of limits resistance in the CMP harness or component. This may be due to a short or open circuit, depending on the result of the last measurement.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the Crankshaft position (CKP) sensor circuit
  2. Short circuit to GROUND in the camshaft position (CMP) sensor circuit
  3. Short circuit to POWER in the crankshaft position (CKP) sensor circuit
  4. Short circuit to POWER in the camshaft position (CMP) sensor circuit
  5. Open circuit in the crankshaft position (CKP) sensor circuit
  6. Open circuit in the camshaft position (CMP) sensor circuit
  7. Crankshaft position sensor
  8. Camshaft position sensor
  9. ECM

Crankshaft position (CKP) sensor connector

Crankshaft position sensor - signal02
Crankshaft position sensor - positive01
Crankshaft position sensor - negative03

Camshaft position sensor bank 1 (CMP1) connector

Camshaft position sensor - signal01
Camshaft position sensor - power03
Camshaft position sensor - return02

Engine control module (ECM) connector

Camshaft position sensor - signalC-G4
Camshaft position sensor - returnC-H3
Camshaft position sensor - powerC-H4
Crankshaft position sensor - signalC-F1
Crankshaft position sensor - positiveC-G1
Crankshaft position sensor - negativeC-G2

Pinpoint Test P: CRANKSHAFT (CKP) AND CAMSHAFT (CMP) POSITION SENSORS

Pinpoint Test P

P1 CHECK THE CKP FOR SHORT CIRCUIT TO GROUND
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Crankshaft position sensor - negative - Pin C-G2 Negative post Crankshaft position sensor - positive - Pin C-G1 Negative post Crankshaft position sensor - signal - Pin C-F1 Negative post
Are the resistances greater than 100 Kohms?
YES Go to step 2 . → P2
NO REPAIR the short circuit to GROUND in the CKP harness or component.
P2 CHECK THE CKP CIRCUIT FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Crankshaft position sensor - negative - Pin C-G2 Positive post Crankshaft position sensor - positive - Pin C-G1 Positive post Crankshaft position sensor - signal - Pin C-F1 Positive post
Are the resistances greater than 100 Kohms?
YES Go to step 3 . → P3
NO REPAIR the short circuit to GROUND in the CKP harness or component.
P3 CHECK THE CKP CIRCUIT RESISTANCE
  1. Measure the resistance between
  2. Crankshaft position sensor - signal - Pin C-F1 Crankshaft position sensor - negative - Pin C-G2
Is the resistance between 100 Kohms - 120 Kohms?
YES Go to step 4 . → P4
NO REPAIR the out of limits resistance in the CKP harness or component. This may be due to a short or open circuit, depending on the result of the last measurement.
P4 CHECK THE CKP CIRCUIT RESISTANCE
  1. Measure the resistance between
  2. Crankshaft position sensor - positive - Pin C-G1 Crankshaft position sensor - signal - Pin C-F1 Crankshaft position sensor - positive - Pin C-G1 Crankshaft position sensor - negative - Pin C-G2
Are the resistances greater than 100 Kohms?
YES Go to step 5 . → P5
NO REPAIR the out of limits resistance in the CKP harness or component. This may be due to a short or open circuit, depending on the result of the last measurement.
P5 CHECK THE CMP FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Camshaft position sensor - power - Pin C-H4 Negative post Camshaft position sensor - return - Pin C-H3 Negative post Camshaft position sensor - signal - Pin C-G4 Negative post
Are the resistances greater than 100 Kohms?
YES Go to step 6 . → P6
NO REPAIR the short circuit to GROUND in the CMP harness or component.
P6 CHECK CMP CIRCUIT FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Camshaft position sensor - power - Pin C-H4 Positive post Camshaft position sensor - return - Pin C-H3 Positive post Camshaft position sensor - signal - Pin C-G4 Positive post
Are the resistances greater than 100 Kohms?
YES Go to step 7 . → P7
NO REPAIR the short circuit to POWER in the CMP harness or component.
P7 CHECK THE CMP CIRCUIT RESISTANCE
  1. Measure the resistance between
  2. Camshaft position sensor - return - Pin C-H3 Camshaft position sensor - signal - Pin C-G4
Is the resistance between 100 Kohms - 120 Kohms?
YES Go to step 8 . → P8
NO REPAIR the out of limits resistance in the CMP harness or component. This may be due to a short or open circuit, depending on the result of the last measurement.
P8 CHECK THE CMP CIRCUIT RESISTANCE
  1. Measure the resistance between
  2. Camshaft position sensor - power - Pin C-H4 Camshaft position sensor - signal - Pin C-G4 Camshaft position sensor - power - Pin C-H4 Camshaft position sensor 2 - return
Are the resistances greater than 100 Kohms?
YES No fault found in the tests. However the following may be suspect: - Open circuit in sensor power line - CMP connector - CKP connector - CMP sensor - CKP sensor - Crank target wheel - ECM connector - ECM
NO REPAIR the out of limits resistance in the CMP harness or component. This may be due to a short or open circuit, depending on the result of the last measurement.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the accelerator pedal position (APP1) sensor circuit
  2. Short circuit to GROUND in the accelerator pedal position (APP2) sensor circuit
  3. Short circuit to POWER in the accelerator pedal position (APP1) sensor circuit
  4. Short circuit to POWER in the accelerator pedal position (APP2) sensor circuit
  5. Open circuit in the accelerator pedal position (APP1) sensor circuit
  6. Open circuit in the accelerator pedal position (APP2) sensor circuit
  7. Accelerator pedal position sensor 1
  8. Accelerator pedal position sensor 2
  9. ECM

Accelerator pedal position (APP) sensor connector

Accelerator pedal position sensor 2 - signal01
Accelerator pedal position sensor 2 - power02
Accelerator pedal position sensor 2 - return06
Accelerator pedal position sensor 1 - signal04
Accelerator pedal position sensor 1 - power05
Accelerator pedal position sensor 1 - return03

Engine control module (ECM) connector

Accelerator pedal position sensor 2 - returnA-B2
Accelerator pedal position sensor 2 - powerA-D2
Accelerator pedal position sensor 2 - signalA-C2
Accelerator pedal position sensor 1 - returnA-C1
Accelerator pedal position sensor 1 - powerA-E1
Accelerator pedal position sensor 1 - signalA-D1

Pinpoint Test Q: ACCELERATOR PEDAL POSITION (APP) SENSORS 1 AND 2

Pinpoint Test Q

Q1 CHECK THE APP1 VALUE, WITH THE ACCELERATOR PEDAL RELEASED
  1. Key on, engine off.
  2. Ensure the accelerator pedal is released.
  3. Access the ECM-Pedal position sensor 1 (voltage) PID using a scan tool.
Is the voltage between 0 volts - 1 volts?
YES Go to step 2 . → Q2
NO Go to step 5 . → 5
Q2 CHECK THE APP2 VALUE, WITH THE ACCELERATOR PEDAL RELEASED
  1. Ensure the accelerator pedal is released.
  2. Access the ECM-Pedal position sensor 2 (voltage) PID using a scan tool.
Is the voltage between 3 volts - 5 volts?
YES Go to step 3 . → Q3
NO Go to step 25 . → 25
Q3 CHECK THE APP1 VALUE, WITH THE ACCELERATOR FULLY DEPRESSED
  1. Ensure the accelerator pedal is fully depressed.
  2. Access the ECM-Pedal position sensor 1 (voltage) PID using a scan tool.
Is the voltage between 2.2 volts - 2.7 volts?
YES Go to step 4 . → Q4
NO Go to step 5 . → 5
Q4 CHECK THE APP2 VALUE, WITH THE ACCELERATOR FULLY DEPRESSED
  1. Ensure the accelerator pedal is fully depressed.
  2. Access the ECM-Pedal position sensor 2 (voltage) PID using a scan tool.
Is the voltage between 2.2 volts - 2.7 volts?
YES No fault found.
NO Go to step 25 . → 25
Q5 CHECK THE APP1 SENSOR RETURN LINE
  1. Key off.
  2. APP Sensor connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - return - Pin 03 Negative post
Is the resistance less than 10 ohms?
YES Go to step 6 . → Q6
NO Go to step 23 . → 23
Q6 CHECK THE APP1 VOLTAGE
  1. Measure the voltage between
  2. Accelerator pedal position sensor 1 - power - Pin 05 Negative post
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 7 . → Q7
NO Go to step 15 . → 15
Q7 CHECK THE APP1 SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - signal - Pin 04 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 8 . → Q8
NO Go to step 11 . → 11
Q8 CHECK THE APP1 SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - signal - Pin 04 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 9 . → Q9
NO Go to step 13 . → 13
Q9 CHECK FOR SHORT CIRCUIT BETWEEN THE APP1 SIGNAL AND POWER LINES
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - power - Pin 05 Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - return - Pin 03
Are the resistances greater than 100 Kohms?
YES Go to step 10 . → Q10
NO Go to step 14 . → 14
Q10 CHECK THE APP1 SIGNAL LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - signal - Pin A-D1
Is the resistance less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - APP connector - APP sensor - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q11 CHECK THE APP1 CIRCUIT(S) FOR SIGNAL AND RETURN LINES SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 12 . → Q12
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q12 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE APP1 HARNESS OR ECU
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - signal - Pin 04 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q13 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP1 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - signal - Pin 04 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q14 CHECK WHETHER THE SHORT CIRCUIT IS IN THE APP1 HARNESS OR CONTROL UNIT
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - power - Pin 05 Accelerator pedal position sensor 1 - signal - Pin 04 Accelerator pedal position sensor 1 - return - Pin 03
Are the resistances greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q15 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - power - Pin 05 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 16 . → Q16
NO Go to step 20 . → 20
Q16 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - power - Pin 05 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 17 . → Q17
NO Go to step 22 . → 22
Q17 CHECK THE APP1 5 VOLT SUPPLY LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 1 - power - Pin 05 Accelerator pedal position sensor 1 - power - Pin A-E1
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector. - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q18 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - power - Pin 05 Accelerator pedal position sensor 1 - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 19 . → Q19
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q19 CHECK THE APP1 SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - return - Pin 03 Accelerator pedal position sensor 1 - return - Pin A-C1
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector. - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q20 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - power - Pin 05 Accelerator pedal position sensor 1 - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 21 . → Q21
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q21 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE APP1 HARNESS OR ECU
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - power - Pin 05 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q22 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP1 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - power - Pin 05 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q23 CHECK THE APP1 SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 1 - return - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 18 . → Q18
NO Go to step 24 . → 24
Q24 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP1 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 1 - return - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q25 CHECK THE APP2 SENSOR RETURN LINE
  1. Key off.
  2. APP Sensor connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - return - Pin 06 Negative post
Is the resistance less than 10 ohms?
YES Go to step 26 . → Q26
NO Go to step 38 . → 38
Q26 CHECK THE APP2 VOLTAGE
  1. Measure the voltage between
  2. Accelerator pedal position sensor 2 - power - Pin 02 Negative post
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 27 . → Q27
NO Go to step 35 . → 35
Q27 CHECK THE APP2 SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - signal- Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 28 . → Q28
NO Go to step 31 . → 31
Q28 CHECK THE APP2 SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 29 . → Q29
NO Go to step 33 . → 33
Q29 CHECK FOR SHORT CIRCUIT BETWEEN THE APP2 SIGNAL AND THE POWER LINE
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - signal - Pin 01 Accelerator pedal position sensor 2 - power - Pin 02 Accelerator pedal position sensor 2 - signal - Pin 01 Accelerator pedal position sensor 2 - return - Pin 06
Are the resistances greater than 100 Kohms?
YES Go to step 30 . → Q30
NO Go to step 34 . → 34
Q30 CHECK THE APP2 SIGNAL LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 2 - signal - Pin 01 Accelerator pedal position sensor 2 - signal - Pin A-C2
Is the resistance less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - APP connector - APP sensor - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q31 CHECK THE APP2 CIRCUIT(S) FOR SIGNAL AND RETURN LINES SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - signal - Pin 01 Accelerator pedal position sensor 2 - return - Pin 06
Is the resistance greater than 100 Kohms?
YES Go to step 32 . → Q32
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q32 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE APP2 HARNESS OR ECU
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - signal - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q33 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP2 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - signal - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q34 CHECK WHETHER THE SHORT CIRCUIT IS IN THE APP2 HARNESS OR CONTROL UNIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 2 - signal - Pin 01 Accelerator pedal position sensor 2 - power - Pin 02 Accelerator pedal position sensor 2 - signal - Pin 01 Accelerator pedal position sensor 2 - return - Pin 06
Are the resistances greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q35 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - power - Pin 02 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 36 . → Q36
NO Go to step 41 . → 41
Q36 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - power - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 37 . → Q37
NO Go to step 43 . → 43
Q37 CHECK THE APP2 5 VOLT SUPPLY LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 2 - power - Pin 02 Accelerator pedal position sensor 2 - power - Pin A-D2
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q38 CHECK THE APP2 SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - return - Pin 06 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 39 . → Q39
NO Go to step 44 . → 44
Q39 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - return - Pin 06 Accelerator pedal position sensor 2 - power - Pin 02
Is the resistance greater than 100 Kohms?
YES Go to step 40 . → Q40
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q40 CHECK THE APP2 SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - return - Pin 06 Accelerator pedal position sensor 2 - return - Pin A-B2
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q41 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Accelerator pedal position sensor 2 - power - Pin 02 Accelerator pedal position sensor 2 - return - Pin 06
Is the resistance greater than 100 Kohms?
YES Go to step 42 . → Q42
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q42 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE APP2 HARNESS OR ECU
  1. Measure the resistance between
  2. Accelerator pedal position sensor 2 - power - Pin 02 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q43 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP2 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - power - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
Q44 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE APP2 HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Accelerator pedal position sensor 2 - return - Pin 06 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

This pinpoint test is intended to diagnose the following

  1. Short circuit to GROUND in the manifold absolute pressure (MAP) sensor circuit
  2. Short circuit to POWER in the manifold absolute pressure (MAP) sensor circuit
  3. Open circuit in the manifold absolute pressure (MAP) sensor circuit
  4. Manifold absolute pressure sensor
  5. ECM

Manifold absolute pressure (MAP) sensor connector

Manifold absolute pressure sensor - signal02
Manifold absolute pressure sensor - power01
Manifold absolute pressure sensor - return03

Engine control module (ECM) connector

Manifold absolute pressure sensor - returnC-E2
Manifold absolute pressure sensor - powerC-D1
Manifold absolute pressure sensor - signalC-C1

Pinpoint Test R: MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR

Pinpoint Test R

R1 CHECK THE MAP SENSOR CONNECTOR FOR PHYSICAL DAMAGE OR CORROSION
  1. Inspect the sensor for damage, correct fitment, connection, etc.
Is the sensor correctly installed and in good condition?
YES Go to step 2 . → R2
NO CHECK and rectify as necessary. See «Manifold Absolute Pressure and Temperature (MAPT) Sensor»(ref-311295-S19814078372009032500000) .
R2 CHECK THE MAP PID VALUE
  1. Key on, engine run.
  2. Access the OBDII-Intake Manifold Absolute Pressure PID using a scan tool.
  3. Slowly increase the engine speed to 1,500 RPM while monitoring the PID.
Did the pressure increase smoothly as the engine speed was increased?
YES No fault found.
NO Go to step 3 . → 3
R3 CHECK THE MAP SENSOR RETURN LINE
  1. Key off.
  2. MAP Sensor connector disconnected.
  3. Measure the resistance between
  4. Manifold absolute pressure sensor - return - Pin 03 Negative post
Is the resistance less than 10 ohms?
YES Go to step 4 . → R4
NO Go to step 15 . → 15
R4 CHECK THE MAP VOLTAGE
  1. Key on, engine off.
  2. Measure the voltage between
  3. Manifold absolute pressure sensor - power - Pin 01 Negative post
Is the voltage between 4.8 volts - 5.2 volts?
YES Go to step 5 . → R5
NO Go to step 12 . → 12
R5 CHECK THE MAP SIGNAL LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - signal - Pin 02 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 6 . → R6
NO Go to step 9 . → 9
R6 CHECK THE MAP SIGNAL LINE FOR SHORT CIRCUIT TO POWER
  1. Key on, engine off.
  2. Measure the resistance between
  3. Manifold absolute pressure sensor - signal - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 7 . → R7
NO Go to step 10 . → 10
R7 CHECK THE MAP SIGNAL LINE FOR SHORT CIRCUIT TO SIGNAL RETURN AND SENSOR POWER
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - signal - Pin 02 Manifold absolute pressure sensor - power - Pin 01 Manifold absolute pressure sensor - signal - Pin 02 Manifold absolute pressure sensor - return - Pin 03
Are the resistances greater than 100 Kohms?
YES Go to step 8 . → R8
NO Go to step 11 . → 11
R8 CHECK THE MAP SIGNAL LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Manifold absolute pressure sensor - signal - Pin 02 Manifold absolute pressure sensor - signal - Pin C-C1
Is the resistance less than 10 ohms?
YES An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - MAP connector. - MAP - ECM connector. - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
R9 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE MAP HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - signal - Pin 02 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
R10 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE TMAP HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - signal - Pin 02 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
R11 CHECK WHETHER THE SHORT CIRCUIT IS IN THE MAP HARNESS OR CONTROL UNIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Manifold absolute pressure sensor - signal - Pin 02 Manifold absolute pressure sensor - power - Pin 01 Manifold absolute pressure sensor - signal - Pin 02 Manifold absolute pressure sensor - return - Pin 03
Are the resistances greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
R12 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO GROUND
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - power - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Go to step 13 . → R13
NO Go to step 18 . → 18
R13 CHECK THE 5 VOLT SUPPLY LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - power - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 14 . → R14
NO Go to step 19 . → 19
R14 CHECK THE MAP 5 VOLT SUPPLY LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - power - Pin 01 Manifold absolute pressure sensor - power - Pin C-D1
Is the resistance less than 10 ohms?
YES Suspect : - ECM connector. - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
R15 CHECK THE MAP SENSOR RETURN LINE FOR SHORT CIRCUIT TO POWER
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - return - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Go to step 16 . → R16
NO Go to step 20 . → 20
R16 CHECK WHETHER THE 5 VOLT SUPPLY AND SIGNAL RETURN LINES ARE SHORTED TOGETHER
  1. Measure the resistance between
  2. Manifold absolute pressure sensor - power - Pin 01 Manifold absolute pressure sensor - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Go to step 17 . → R17
NO Go to step 21 . → 21
R17 CHECK THE MAP SENSOR RETURN LINE FOR OPEN CIRCUIT
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - return - Pin 03 Manifold absolute pressure sensor - return - Pin C-E2
Is the resistance less than 10 ohms?
YES Suspect : - MAP connector - ECM connector - MAP - ECM
NO REPAIR the open circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
R18 CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE MAP HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - power - Pin 01 Negative post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
R19 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE MAP HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - power - Pin 01 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
R20 CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE MAP HARNESS OR ECU
  1. Key off.
  2. ECM connector disconnected.
  3. Key on, engine off.
  4. Measure the resistance between
  5. Manifold absolute pressure sensor - return - Pin 03 Positive post
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.
R21 CHECK WHETHER THE SHORT CIRCUIT IS IN THE MAP HARNESS OR CONTROL UNIT
  1. Key off.
  2. ECM connector disconnected.
  3. Measure the resistance between
  4. Manifold absolute pressure sensor - power - Pin 01 Manifold absolute pressure sensor - return - Pin 03
Is the resistance greater than 100 Kohms?
YES Suspect: - ECM
NO REPAIR the short circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article.

Scheme 15

Scheme 15: Removal
Scheme 15: Removal

Scheme 16

Scheme 16
Scheme 16
  1. Switch the ignition on.
  2. Position the front seat fully rearwards.
  3. Switch the ignition off.
  4. Remove the driver's side footwell trim panel. Release the 3 clips.
  5. Release the brake pedal position (BPP) switch. Rotate the BPP switch 45 degrees counter-clockwise.
  6. Remove the BPP switch. Disconnect the electrical connector.

More articles — Electronic Engine Controls - 2.7L Diesel