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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Engine Controls - Tests W/Codes - 7.3L Diesel - EEC-IV) >> Pinpoint Tests >> Pinpoint Test E: Accelerator Pedal Sensor >> Diagnostic Aids

Diagnostic Aids

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  1. 1) DTC 0123

    DTC 0123 indicates AP sensor circuit high input. Possible causes for this DTC are:
    • Damaged accelerator pedal assembly.
    • AP sensor not installed properly.
    • Faulty AP sensor.
    • Short to power in wiring harness.
    • Faulty Powertrain Control Module (PCM).

    With scan tool connected, turn ignition on. Access AP PID (voltage) from PID/DATA MONITOR & RECORD menu. While observing scan tool, slowly depress accelerator pedal. If voltage reading changes to more than 4.5 volts, go to next step. If voltage reading does not change to more than 4.5 volts, fault cannot be duplicated at this time. Clear DTCs, and repeat QUICK TEST .

  2. 2) Induce Opposite Failure

    Disconnect AP sensor connector. AP sensor is mounted above accelerator pedal. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. If voltage reading changes from more than 4.5 volts to zero volts when connector is disconnected, circuit is okay. Replace accelerator pedal assembly. Clear DTCs, and repeat QUICK TEST . If voltage reading does not change from more than 4.5 volts to zero volts when connector is disconnected, go to next step.

  3. 3) Check AP Sensor Signal Wire

    Turn ignition on. Measure voltage between ground and AP signal circuit terminal (Gray/White wire) at AP sensor wiring harness connector. If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, replace PCM. Clear DTCs, and repeat QUICK TEST .

  4. 4) Check For Short To Power

    Turn ignition off. Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between ground and test pin No. 89 at breakout box. If voltage is present, locate and repair short to power in Gray/White wire. Clear DTCs, and repeat QUICK TEST . If voltage is not present, replace PCM. Clear DTCs, and repeat QUICK TEST .

  5. 5) DTC 0122

    DTC 0122 indicates AP sensor circuit low input. Possible causes for this DTC are:
    • Damaged accelerator pedal assembly.
    • AP sensor not installed properly.
    • Faulty AP sensor.
    • Grounded wiring harness.
    • Faulty Powertrain Control Module (PCM).

    With scan tool connected, turn ignition on. Access AP PID (voltage) from PID/DATA MONITOR & RECORD menu on tester. While observing scan tool, slowly depress accelerator pedal. If voltage reading changes to less than .37 volt, go to next step. If voltage reading does not change to less than .37 volt, fault cannot be duplicated at this time. Clear DTCs, and repeat QUICK TEST .

  6. 6) Induce Opposite Failure

    Disconnect AP sensor connector. Connect a jumper wire between VREF circuit terminal (Brown/White wire) and AP sensor signal circuit terminal (Gray/White wire) at AP sensor wiring harness connector. If voltage reading changes from less than .37 volt to more than 4.5 volts with jumper connected, circuit is okay. Replace accelerator pedal assembly. Clear DTCs, and repeat QUICK TEST . If voltage reading does not change from less than .37 volt to more than 4.5 volts with jumper connected, go to next step.

  7. 7) Check VREF Circuit Voltage

    Turn ignition on. Measure voltage between ground and VREF circuit terminal (Brown/White wire) at AP sensor wiring harness connector. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, locate and repair open in VREF circuit. Clear DTCs, and repeat QUICK TEST .

  8. 8) Check SIG RTN Circuit

    Turn ignition off. Measure resistance between ground and SIG RTN circuit terminal (Gray/Red wire) at AP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open in SIG RTN circuit. Clear DTCs, and repeat QUICK TEST .

  9. 9) Check AP sensor Circuit Continuity

    Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between AP sensor signal circuit terminal (Gray/White wire) and test pin No. 89 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open in AP signal circuit. Clear DTCs, and repeat QUICK TEST .

  10. 10) Check For Short To Ground

    Turn ignition off. Ensure AP sensor is disconnected. Measure resistance between test pin No. 89 and test pins No. 51, 76, 77 and 103 at breakout box. If each reading is more than 10 k/ohms, go to next step. If any reading is 10 k/ohms or less, locate and repair short to ground in AP sensor signal circuit (Gray/White wire). Clear DTCs, and repeat QUICK TEST .

  11. 11) Check VREF Circuit Continuity

    Measure resistance between VREF circuit terminal (Brown/White wire) at AP sensor wiring harness connector and test pin No. 90 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open in VREF circuit. Clear DTCs, and repeat QUICK TEST .

  12. 12) Check SIG RTN Circuit Continuity

    Measure resistance between SIG RTN circuit terminal (Gray/Red wire) at AP sensor wiring harness connector and test pin No. 91 at breakout box. If resistance less than 5 ohms, replace PCM. Clear DTCs, and repeat QUICK TEST . If resistance 5 ohms or more, locate and repair open in SIG RTN circuit. Clear DTCs, and repeat QUICK TEST .
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