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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 435 (6.7L Diesel - DTCS P1209 To P2281 - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P2128-Accelerator Pedal Position Sensor 2 Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. APP SENSOR NO. 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. Ignition on, engine not running.
    2. With a scan tool, read the APP Sensor No. 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.
    3. Ignition on, engine not running.
    4. With a scan tool, monitor the Accelerator Pedal Position Sensor voltage.

      Is the voltage above 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 APPS values.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
  3. CHECK THE (K29) APP SENSOR 2 SIGNAL CIRCUIT FOR A SHORT TO BATTERY 
    Fig 1: Measuring Voltage On (K29) App Sensor No. 2 Signal Circuit In App Sensor Harness Connector
    GC0090982Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the C2 PCM harness connector.
    3. Ignition on, engine not running.
    4. Measure the voltage on the (K29) APP Sensor 2 Signal circuit in the APP Sensor harness connector.

      Is the voltage above 0 Volts?

      Yes 

      • Repair the (K29) APP Sensor 2 Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .

      No 

      • Go To  4
  4. CHECK FOR THE (K29) APP SENSOR 2 SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT 
    Fig 2: Measuring Resistance Between (K29) App Sensor No. 2 Signal Circuit And (F856) 5-Volt Supply Circuit In App Sensor Harness Connector
    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 - 6.7L. Refer to STANDARD PROCEDURE .

      No 

      • Go To  5
  5. CHECK FOR THE (K29) APP SENSOR 2 SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 3: Measuring Resistance Between (K29) App Sensor No. 2 Signal Circuit And (F855) 5-Volt Supply Circuit In App Sensor Harness Connector
    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 - 6.7L. Refer to STANDARD PROCEDURE .

      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 5.0 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 - 6.7L. Refer to STANDARD PROCEDURE .
  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 

      • Repair as necessary.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .

      No 

      • Replace and program the Powertrain Control Module in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
  8. APP SENSOR NO. 2 SWEEP 
    1. Ignition on, engine not running.
    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 APPS values.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
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