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  • P1286 APPS Sensor Supply Voltage Too High

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    DTC P1286: ACCELERATOR POSITION SENSOR (APPS) SUPPLY VOLTAGE TOO HIGH

    Monitor & Set Conditions

    Accelerator Pedal Position Sensor (APPS) supply voltage is monitored when engine is running. DTC may be stored if Engine Control Module (ECM) senses high voltage on APPS supply circuit.

    Possible Causes

    • APPS Supply Circuit Shorted To Voltage
    • APPS Shorted To Voltage
    • APPS Signal Circuit Shorted To Voltage
    • APPS Signal Shorted To Voltage
    • APPS
    • APPS Return Circuit Open
    • APPS Signal Circuit Open
    • APPS Supply Circuit Open
    • ECM

    Testing

    1. Turn ignition off. Disconnect APPS harness connector. APPS is located on bracket, just above fuel injection pump. Check for poor connection/terminal contact at APPS harness connector. Repair as necessary. Start engine and allow engine to idle. Using DVOM, measure voltage between ground and terminal No. 5 (Dark Blue/White wire) on APPS harness connector. If voltage is greater than 5.5 volts, go to next step. If voltage is 5.5 volts or less, go to step 4 .

    2. Shut engine off. Ensure APPS harness connector is still disconnected. Turn ignition on with engine off. Using DVOM, measure voltage between ground and terminal No. 5 (Dark Blue/White wire) on APPS harness connector. If voltage is greater than 5.5 volts, go to next step. If voltage is 5.5 volts or less, repair short to voltage on Dark Blue/White wire between APPS and ECM when engine is running.

    3. Turn ignition off. Ensure APPS harness connector is still disconnected. Disconnect ECM harness connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Check for poor connection/terminal contact at ECM harness connector. Repair as necessary. Turn ignition on with engine off. Using DVOM, measure voltage between ground and terminal No. 5 (Dark Blue/White wire) on APPS harness connector. If voltage is 5.5 volts or less, replace and program ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. If voltage is greater than 5.5 volts, repair short to voltage on Dark Blue/White wire between APPS and ECM.

    4. Turn ignition off. Using DVOM, measure voltage between ground and terminal No. 3 (Light Blue/Black wire) on APPS harness connector. If voltage is greater than 5.5 volts, go to next step. If voltage is 5.5 volts or less, go to step 7 .

    5. Ensure APPS harness connector is still disconnected. Turn ignition on with engine off. Using DVOM, measure voltage between ground and terminal No. 3 (Light Blue/Black wire) on APPS harness connector. If voltage is greater than 5.5 volts, go to next step. If voltage is 5.5 volts or less, repair short to voltage on Light Blue/Black wire between APPS and ECM.

    6. Turn ignition off. Ensure APPS harness connector is still disconnected. Disconnect ECM harness connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Check for poor connection/terminal contact at ECM harness connector. Repair as necessary. Turn ignition on with engine off. Using DVOM, measure voltage between ground and terminal No. 3 (Light Blue/Black wire) on APPS harness connector. If voltage is 5.5 volts or less, replace and greater than 5.5 volts, repair short to voltage on Light Blue/Black wire between APPS and ECM.

    7. Ensure ignition is off. Ensure APPS harness connector is still disconnected. Disconnect ECM harness connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Check for poor connection/terminal contact at ECM harness connector. Repair as necessary. Measure resistance of Dark Blue/White wire between terminal No. 5 on APPS harness connector and terminal No. 31 on ECM harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in Dark Blue/White wire between APPS and ECM.

    8. Ensure ignition is off. Ensure APPS harness connector and ECM harness connector are still disconnected. Measure resistance of Black/Yellow wire between terminal No. 4 on APPS harness connector and terminal No. 32 on ECM harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in Black/Yellow wire between APPS and ECM.

    9. Ensure ignition is off. Ensure APPS harness connector and ECM harness connector are still disconnected. Measure resistance of Light Blue/Black wire between terminal No. 3 on APPS harness connector and terminal No. 25 on ECM harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in Light Blue/Black wire between APPS and ECM.

    10. Replace APPS. See appropriate REMOVAL, OVERHAUL & INSTALLATION article.


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