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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 418 (5.7L CNG - DTCS P060B To P2128 - 2500 Hd) >> Diagnosis And Testing >> P2127-Accelerator Pedal Position Sensor 2 Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 2500 HD and 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    NOTE:

    Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.

    1. Start the engine and allow it to reach normal operating temperature.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

    2. With the scan tool, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (K854) 5-VOLT SUPPLY CIRCUIT VOLTAGE 
    Fig 1: Checking 5-Volt Supply Circuit For Voltage
    GC0141961Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Accelerator Pedal Position Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (K854) 5-Volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.

      Is the voltage above 4.8 volts?

      Yes 

      • Go To  7

      No 

      • Go To  3
  3. CHECK THE (K854) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    Fig 2: Checking 5-Volt Supply Circuit For Short To Ground
    GC0141962Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition on.
    2. Disconnect the PCM C1 harness connector.
    3. Measure the resistance between ground and the (K854) 5-Volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (K854) 5-Volt Supply circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  4. CHECK FOR THE (K854) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K400) SENSOR GROUND CIRCUIT 
    Fig 3: Checking 5-Volt Supply Circuit For Short To Sensor Ground Circuit
    GC0141944Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K854) 5-Volt Supply circuit and the (K400) Sensor Ground circuit in the Accelerator Pedal Position Sensor harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (K854) 5-Volt Supply circuit for a short to the (K400) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  5. CHECK FOR THE (K854) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K167) SENSOR GROUND CIRCUIT 
    Fig 4: Checking 5-Volt Supply Circuit For Short To Sensor Ground Circuit
    GC0141945Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K854) 5-Volt Supply circuit and the (K167) Sensor Ground circuit in the Accelerator Pedal Position Sensor harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (K854) 5-Volt Supply circuit for a short to the (K167) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  6. CHECK THE (K854) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    1. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
    2. Measure the resistance of the (K854) 5-Volt Supply circuit between the Accelerator Pedal Position Sensor harness connector and the GPEC Adaptor.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  12

      No 

      • Repair the (K854) 5-Volt Supply circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  7. CHECK THE (K29) APP SIGNAL 2 CIRCUIT FOR A SHORT TO GROUND 
    Fig 5: Checking APP Signal 2 Circuit For Short To Ground
    GC0141946Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
    3. Measure the resistance between ground and the (K29) APP Signal 2 circuit in the Accelerator Pedal Position Sensor harness connector.

      Is the resistance above 10v Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the (K29) APP Signal 2 circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  8. CHECK FOR THE (K29) APP SIGNAL 2 CIRCUIT SHORTED TO THE (K400) SENSOR GROUND CIRCUIT 
    Fig 6: Checking APP Signal 2 Circuit For Short To Sensor Ground Circuit
    GC0141963Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K29) APP Signal 2 circuit and the (K400) Sensor Ground circuit in the Accelerator Pedal Position Sensor harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (K29) APP Signal 2 circuit for a short to the (K400) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  9. CHECK FOR THE (K29) APP SIGNAL 2 CIRCUIT SHORTED TO THE (K167) SENSOR GROUND CIRCUIT 
    Fig 7: Checking APP Signal 2 Circuit For Short To Sensor Ground Circuit
    GC0141947Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K29) APP Signal 2 circuit and the (K167) Sensor Ground circuit in the Accelerator Pedal Position Sensor harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  10

      No 

      • Repair the (K29) APP Signal 2 circuit for a short to the (K167) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  10. CHECK THE (K29) APP SIGNAL 2 CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    1. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
    2. Measure the resistance of the (K29) APP Signal 2 circuit between the Accelerator Pedal Position Sensor harness connector and the GPEC Adaptor.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  11

      No 

      • Repair the (K29) APP Signal 2 circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  11. ACCELERATOR PEDAL POSITION SENSOR 
    1. Turn the ignition off.
    2. Connect the PCM C1 harness connector.
    3. Connect a jumper between the (K854) 5-Volt Supply circuit and the (K29) APP Signal 2 circuit in the Accelerator Pedal Position Sensor harness connector.
    4. Turn the ignition on.
    5. With the scan tool, read the Accelerator Pedal Position Sensor signal voltage.

      Is the voltage above 4.8 volts with the jumper in place?

      Yes 

      • Replace the Accelerator Pedal Position Sensor in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  12
  12. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Accelerator Pedal Position Sensor and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched, or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals.
    4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
    5. Look for the data to change or for the DTC to reset during the wiggle test.
    6. Perform any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      • Repair as necessary.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

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