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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1574 (6.7L Diesel - DTCS P20B7 To P24A0 - 2500 Hd) >> DTC Troubleshooting >> P2128-Accelerator Pedal Position Sensor 2 Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. APP SENSOR 2 VOLTAGE ABOVE 2.5 VOLTS 
    NOTE:

    When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode.

    1. Turn the ignition on.
    2. With a scan tool, read the APP Sensor 2 voltage.
      NOTE:

      Diagnose any 5-Volt Supply DTCs before continuing.

      Is the voltage above 2.5 volts?

      Yes 

      • Go To  2

      No 

      • Go To  8
  2. CHECK THE ACCELERATOR PEDAL POSITION SENSOR 
    1. Turn the ignition off.
    2. Disconnect the APP Sensor harness connector.
      NOTE:

      Check the connector for proper connection to the sensor and carefully inspect for pushed out, corroded or damaged terminals in the connector before performing any electrical checks or replacing any components.

    3. Turn the ignition on.
    4. With a scan tool, monitor the Accelerator Pedal Position Sensor voltage.

      Is the voltage above 0.0 volts?

      Yes 

      • Go To  3

      No 

      • Replace the APP Sensor Assembly in accordance with the Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APP Sensor values.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. CHECK THE (K29) APP SENSOR 2 SIGNAL CIRCUIT FOR A SHORT TO BATTERY 
    GC0090982Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the C2 PCM harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (K29) APP Sensor 2 Signal circuit in the APP Sensor harness connector.

      Is the voltage above 0.0 volts?

      Yes 

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

      No 

      • Go To  4
  4. CHECK FOR THE (K29) APP SENSOR 2 SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT 
    GC0090983Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Measure the resistance between the (K29) APP Sensor 2 Signal circuit and the (F856) 5-Volt Supply circuit in the APP Sensor harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the short between the (K29) APP Sensor 2 Signal circuit and the (F856) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK FOR THE (K29) APP SENSOR 2 SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT 
    GC0090984Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K29) APP Sensor 2 Signal circuit and the (F855) 5-Volt Supply circuit in the APP Sensor harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the short between the (K29) APP Sensor 2 Signal circuit and the (F855) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK THE (K400) APP SENSOR 2 RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K400) APP Sensor 2 Return circuit from the APP Sensor harness connector to the C2 PCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K400) APP Sensor 2 Return circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. POWERTRAIN CONTROL MODULE 
    NOTE:

    Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    1. 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 

      No 

      • Replace and program the Powertrain Control Module in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. APP SENSOR 2 SWEEP 
    1. Turn the ignition on.
    2. With a scan tool, monitor the Accelerator Pedal Position Sensor voltage.
    3. Slowly press the Accelerator Pedal down.

      Does voltage start at approximately 0 volts and go above 2.31 volts with a smooth transition?

      Yes 

      No 

      • Replace the APP Sensor Assembly in accordance with the Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APP Sensor values.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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