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Home >> Chrysler >> 2007 >> Crossfire Base, 2D Convertible >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> DTCS P0033 To P0132 >> P0123-Accelerator Pedal Position Sensor Signal 1 Circuit High >> Diagnostic Test

Diagnostic Test

  1. 1) PRE-DIAGNOSTIC CHECK OUT 
    NOTE: Always perform diagnostics with a fully charged battery.
    NOTE: Check connectors - Clean/repair as necessary. Poor pin to terminal connections can set DTCs.
    NOTE: Check for applicable TSBs related to the problem.

    Turn the ignition on.

    With the scan tool, read PCM DTCs.

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Repair as necessary.

    Perform this procedure prior to symptom diagnosis. 

    Continue 

    1. Go to  2).
  2. 2) CHECK THE APP SENSOR SIGNAL 1 VOLTAGE WITH THE SCAN TOOL 

    Turn the ignition on.

    With the scan tool, read the APP 1 voltage.

    Is the voltage above 3.5 volts? 

    Yes 

    1. Go to  3).

    No 

    1. Go to  10).
  3. 3) MEASURE THE APP SENSOR SIGNAL 1 VOLTAGE 
    Fig 1: Checking Sensor Signal Circuit
    GC0034118Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the APP Sensor harness connector.

    NOTE: Check connectors - Clean/repair as necessary.

    Turn the ignition on.

    Measure the voltage of the APP Sensor Signal 1 circuit at the APP Sensor harness connector.

    Is the voltage below 0.05 volt? 

    Yes 

    1. Go to  4).

    No 

    1. Go to  7).
  4. 4) MEASURE THE RESISTANCE BETWEEN GROUND AND THE SENSOR GROUND CIRCUIT 
    Fig 2: Checking Sensor Ground Circuit
    GC0034116Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance between ground and the Sensor Ground circuit at APP Sensor harness connector cavity 6.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  5).

    No 

    1. Go to  6).
  5. 5) CHECK THE PCM 

    Turn the ignition on.

    Connect a jumper wire between the APP Sensor 5-Volt Supply circuit and the APP Sensor Signal 1 circuit at the APP Sensor harness connector.

    With the scan tool, read the APP 1 voltage.

    NOTE: Remove the jumper wire after this step has been completed.

    Is the voltage above 4.7 volts? 

    Yes 

    1. Replace the Accelerator Pedal Position Sensor. Refer to REMOVAL .
    2. Perform POWERTRAIN VERIFICATION TEST - VER 2 .

    No 

    1. Go to  9).
  6. 6) SENSOR GROUND CIRCUIT OPEN 
    Fig 3: Checking Sensor Ground Circuit
    GC0034117Courtesy of CHRYSLER LLC

    With the ignition off.

    Measure the resistance of the Sensor Ground circuit from APP Sensor harness connector cavity 6 to PCM C4 harness connector cavity 6.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  9).

    No 

    1. Repair the Sensor Ground circuit for an open.
    2. Perform POWERTRAIN VERIFICATION TEST - VER 2 .
  7. 7) APP SENSOR SIGNAL 1 CIRCUIT SHORT TO VOLTAGE 
    Fig 4: Checking Sensor Signal Circuit
    GC0034118Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the PCM C4 harness connector.

    NOTE: Check connectors - Clean/repair as necessary.

    Turn the ignition on.

    Measure the voltage of the APP Sensor Signal 1 circuit at the APP Sensor harness connector.

    Is the voltage below 1.0 volt? 

    Yes 

    1. Go to  8).

    No 

    1. Repair the APP Sensor Signal 1 circuit for a short to voltage.
    2. Perform POWERTRAIN VERIFICATION TEST - VER 2 .
  8. 8) APP SENSOR SIGNAL 1 CIRCUIT SHORT TO APP SENSOR 5-VOLT SUPPLY CIRCUIT  
    Fig 5: Checking Signal Circuit & 5-Volt Supply Circuit
    GC0034119Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance of the APP Sensor Signal 1 circuit and the APP Sensor 5-Volt Supply circuit at the APP Sensor harness connector.

    Is the resistance above 100 kohms? 

    Yes 

    1. Go to  9).

    No 

    1. Repair the APP Sensor Signal 1 circuit for a short to the APP Sensor 5-Volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST - VER 2 .
  9. 9) PCM 
    NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    If there are no possible causes remaining, view repair. 

    Repair 

    1. Replace and program the Powertrain Control Module. Refer to REMOVAL .
    2. Perform POWERTRAIN VERIFICATION TEST - VER 2 .
  10. 10) CHECK THE APP SENSOR 1 SWEEP 

    With the ignition on.

    With the scan tool, monitor the APP 1 voltage.

    Slowly open the throttle from the idle position to the wide open throttle position.

    Does voltage start at approximately 0.3 volt and go above 4.7 volts with a smooth transition? 

    Yes 

    1. Go to  11).

    No 

    1. Replace the Accelerator Pedal Position Sensor. Refer to REMOVAL .
    2. Perform POWERTRAIN VERIFICATION TEST - VER 2 .
  11. 11) INTERMITTENT WIRING AND CONNECTORS 

    The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition.

    NOTE: Check connectors - Clean/repair as necessary. Poor pin to terminal connections can set DTCs.
    NOTE: Check for any Technical Service Bulletins that may apply.

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors specific to this DTC. Wiggle the wires while checking for shorts and open circuits.

    Were there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform POWERTRAIN VERIFICATION TEST - VER 2 .

    No 

    1. The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition.
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