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Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  APP SENSOR BELOW 0.25 OF A VOLT 

    Ignition on, engine not running.

    With a scan tool, read the APP Sensor No.1 voltage.

    NOTE: Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens a couple of times a second. So you can expect to see voltages close to zero occasionally with a normal sensor.

    Is the voltage consistently below 0.25 of a volt? 

    Yes 

    1. Go To  2).

    No 

    1. Go To  11).
  2. 2)  (F856) 5-VOLT SUPPLY CIRCUIT 
    Fig 1: Checking Accelerator Pedal Position Sensor 5-Volt Supply Circuit
    GC0015157Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the APP Sensor harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (F856) 5-volt Supply circuit in the APP Sensor harness connector.

    Is the voltage between 4.5 and 5.2 volts? 

    Yes 

    1. Go To  3).

    No 

    1. Go To  8).
  3. 3)  ACCELERATOR PEDAL POSITION SENSOR 
    Fig 2: Checking Accelerator Pedal Position Sensor 2 Signal Circuit & 5-Volt Supply Circuit
    GC0015163Courtesy of DAIMLERCHRYSLER CORP.

    Connect a jumper wire between the (F856) 5-volt Supply circuit and the (K29) APP Sensor No.2 Signal circuit in the Sensor harness connector.

    With a scan tool, monitor the APP Sensor No.2 voltage.

    Is the voltage above 4.5 volts with the jumper wire installed? 

    Yes 

    1. Replace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  4).
      NOTE: Remove the jumper wire before continuing.
  4. 4)  (K29) APP SENSOR NO.2 SIGNAL CIRCUIT OPEN 
    Fig 3: Checking Accelerator Pedal Position Sensor 2 Signal Circuit
    GC0015159Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

    Measure the resistance of the (K29) APP Sensor No.2 Signal circuit from the APP Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  5).

    No 

    1. Repair the open in the (K29) APP Sensor No.2 Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5)  (K29) APP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 4: Checking Accelerator Pedal Position Sensor 2 Signal Circuit
    GC0015160Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (K29) APP Sensor No.2 Signal circuit in the APP Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K29) APP Sensor No.2 Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  6).
  6. 6)  (K29) APP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO THE (K400) APP SENSOR NO.2 RETURN CIRCUIT 
    Fig 5: Checking Accelerator Pedal Position Sensor 2 Signal Circuit & 2 Return Circuit
    GC0015162Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (K29) APP Sensor No.2 Signal circuit and the (K400) Sensor No.2 Return circuit in the APP Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short between the (K400) APP Sensor No.2 Return circuit and the (K29) APP Sensor No.2 Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  7).
  7. 7)  (K29) APP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO THE (K167) APP SENSOR NO.1 RETURN CIRCUIT 
    Fig 6: Checking Accelerator Pedal Position Sensor 2 Signal Circuit & 1 Return Circuit
    GC0015161Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (K29) APP Sensor No.2 Signal circuit and the (K167) Sensor No.1 Return circuit in the APP Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short between the (K167) APP Sensor No.1 Return circuit and the (K29) APP Sensor No.2 Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  10).
  8. 8)  (F856) 5-VOLT SUPPLY CIRCUIT OPEN 
    Fig 7: Checking Accelerator Pedal Position Sensor 5-Volt Supply Circuit
    GC0015156Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

    Measure the resistance of the (F856) 5-volt Supply circuit from the Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  9).

    No 

    1. Repair the open in the (F856) 5-volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  9. 9)  (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 8: Checking Accelerator Pedal Position Sensor 5-Volt Supply Circuit
    GC0015158Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (F856) 5-volt Supply circuit in the APP Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (F856) 5-volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  10).
  10. 10)  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.

    Were there any problems found? 

    Yes 

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

    No 

    1. Replace and program the Powertrain Control Module per Service Information.
    2. Perform POWERTRAIN VERIFICATION TEST .
  11. 11)  APP SENSOR SWEEP  

    Ignition on, engine not running.

    With a scan tool, monitor the APP Sensor No.2 voltage.

    Slowly press the Accelerator pedal down.

    Does voltage start at approximately 0.22 of a volt and go above 2.31 volts with a smooth transition? 

    Yes 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Replace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values.
    2. Perform POWERTRAIN VERIFICATION TEST .
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