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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 3.6L - DTCS P0653 To P2128 >> Diagnosis And Testing >> P2128-Accelerator Pedal Position Sensor 2 Circuit High >> Diagnostic Test

Diagnostic Test

  1. DTC IS ACTIVE 
    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. (K854) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Checking 5-Volt Supply Circuit Voltage
    GC0141961Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Accelerator Pedal Position Sensor harness connector.
    3. Disconnect the Powertrain Control Module (PCM) harness connector.
    4. Turn the ignition on.
    5. Measure the voltage of the (K854) 5-Volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (K854) 5-Volt Supply circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. (K29) APP SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE 
    Fig 2: Checking APP Signal 2 Circuit For Short To Voltage
    GC0141953Courtesy of CHRYSLER GROUP, LLC
    1. Measure the voltage of the (K29) APP Signal 2 circuit in the Accelerator Pedal Position Sensor harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (K29) APP Signal 2 circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. (K29) APP SIGNAL 2 CIRCUIT SHORTED TO THE (K854) 5-VOLT SUPPLY CIRCUIT 
    Fig 3: Checking APP Signal 2 Circuit For Short To 5-Volt Supply Circuit
    GC0141964Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K29) APP Signal 2 circuit and the (K854) 5-Volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.

      Is the resistance below 1000 Ohms?

      Yes 

      • Repair the (K29) APP Signal 2 circuit for a short to the (K854) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. (K29) APP SIGNAL 2 CIRCUIT SHORTED TO THE (K852) 5-VOLT SUPPLY CIRCUIT 
    Fig 4: Checking APP Signal 2 Circuit For Short To 5-Volt Supply Circuit
    GC0141965Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K29) APP Signal 2 circuit and the (K852) 5-Volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.

      Is the resistance below 1000 Ohms?

      Yes 

      • Repair the (K29) APP Signal 2 circuit for a short to the (K852) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. (K29) APP SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 5: Checking APP Signal 2 Circuit For Open Or High Resistance
    GC0141870Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Measure the resistance of the (K29) APP Signal 2 circuit between the Accelerator Pedal Position Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K29) APP Signal 2 circuit for an open circuit or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. (K400) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 6: Checking Sensor Ground Circuit For Open Or High Resistance
    GC0141871Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (K400) Sensor Ground circuit between the Accelerator Pedal Position Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the (K400) Sensor Ground circuit for an open circuit or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. ACCELERATOR PEDAL POSITION SENSOR 
    1. Turn the ignition off.
    2. Connect the Powertrain Control Module (PCM) harness connector.
    3. Connect a jumper wire between the (K400) Sensor Ground 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 below 1.0 volt with the jumper wire in place?

      Yes 

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

      No 

      • Go To  9
  9. 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 

      No 

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