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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 >> P2127-Accelerator Pedal Position Sensor 2 Circuit Low >> 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. CHECK THE APP SENSOR BELOW VOLTAGE 
    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:

      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 0.05 volts?

      Yes 

      • Go To  2

      No 

      • Go To  11
  2. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT 
    GC0090974Courtesy of CHRYSLER GROUP, LLC
    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. Measure the voltage on the (F856) 5-Volt Supply circuit in the APP Sensor harness connector.

      Is the voltage between 4.65 and 5.36 volts?

      Yes 

      • Go To  3

      No 

      • Go To  8
  3. CHECK THE ACCELERATOR PEDAL POSITION SENSOR 
    GC0090979Courtesy of CHRYSLER GROUP, LLC
    1. Connect a jumper wire between the (F856) 5-Volt Supply circuit and the (K29) APP Sensor 2 Signal circuit in the Sensor harness connector.
    2. With a scan tool, monitor the APP Sensor 2 voltage.

      Is the voltage between 4.65 and 5.36 volts with the jumper wire installed?

      Yes 

      • Replace the APP Sensor Assembly in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (K29) APP SENSOR 2 SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    NOTE:

    Remove the jumper wire before continuing.

    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Measure the resistance of the (K29) APP Sensor 2 Signal circuit from the APP Sensor harness connector to the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (K29) APP Sensor 2 Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE (K29) APP SENSOR 2 SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    GC0090976Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between ground and the (K29) APP Sensor 2 Signal circuit in the APP Sensor harness connector.

      Is the resistance below 10k Ohms?

      Yes 

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

      No 

      • Go To  6
  6. CHECK FOR THE (K29) APP SENSOR 2 SIGNAL CIRCUIT SHORTED TO THE (K400) APP SENSOR 2 RETURN CIRCUIT 
    GC0090977Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K29) APP Sensor 2 Signal circuit and the (K400) Sensor 2 Return circuit in the APP Sensor harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the short between the (K400) APP Sensor 2 Return circuit and the (K29) APP Sensor 2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK FOR THE (K29) APP SENSOR 2 SIGNAL CIRCUIT SHORTED TO THE (K167) APP SENSOR 1 RETURN CIRCUIT 
    GC0090978Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K29) APP Sensor 2 Signal circuit and the (K167) Sensor 1 Return circuit in the APP Sensor harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the short between the (K167) App Sensor 1 Return circuit and the (K29) APP Sensor 2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  10
  8. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the C2 PCM harness connector.
    3. Measure the resistance of the (F856) 5-Volt Supply circuit between the APP Sensor harness connector to the C2 PCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (F856) 5-Volt Supply circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    GC0090981Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between ground and the (F856) 5-Volt Supply circuit in the APP Sensor harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the (F856) 5-Volt Supply circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  10
  10. 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 .
  11. APP SENSOR SWEEP 
    1. Turn the ignition on.
    2. With a scan tool, monitor the APP Sensor 2 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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