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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (6.7L Diesel - DTCS P2000 To U1601 - 2500 & 3500) >> Diagnosis and Testing >> P2123-Accelerator Pedal Position Sensor 1 Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. APP SENSOR NO. 1 VOLTAGE ABOVE 4.82 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. 1 voltage.

      Is the voltage above 4.82 volts?

      Yes 

      • Go To  2.

      No 

      • Go To  8.
  2. 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 TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  3. (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 1: Measuring Voltage On (K23) App Sensor No. 1 Signal Circuit In App Sensor Harness Connector
    GC0090970Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connectors.
    3. Ignition on, engine not running.
    4. Measure the voltage on the (K23) APP Sensor No. 1 Signal circuit in the APP Sensor harness connector.

      Is the voltage above 0 Volts?

      Yes 

      • Repair the short to battery voltage in the (K23) APP Sensor No. 1 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      No 

      • Go To  4.
  4. (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 2: Measuring Resistance Between (K23) App Sensor No. 1 Signal Circuit And (F855) 5-volt Supply Circuit In App Sensor Harness Connector
    GC0090971Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Measure the resistance between the (K23) APP Sensor No. 1 Signal circuit and the (F855) 5-volt Supply circuit in the APP Sensor harness connector.

      Is the below 10k Ohms?

      Yes 

      • Repair the short between the (K23) APP Sensor No. 1 Signal circuit and the (F855) 5-volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      No 

      • Go To  5.
  5. (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT 
    Fig 3: Measuring Resistance Between (K23) App Sensor No. 1 Signal Circuit And (F856) 5-volt Supply Circuit In App Sensor Harness Connector
    GC0090972Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (K23) APP Sensor No. 1 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 (K23) APP Sensor No. 1 Signal circuit and the (F856) 5-volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      No 

      • Go To  6.
  6. (K167) APP SENSOR NO. 1 RETURN CIRCUIT OPEN 
    1. Measure the resistance of the (K167) APP Sensor No. 1 Return circuit between the APP Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 10.0 Ohms?

      Yes 

      • Go To  7.

      No 

      • Repair the open or high resistance in the (K167) APP Sensor No. 1 Return circuit.
      • Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  7. POWERTRAIN CONTROL MODULE (PCM) 
    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 TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  8. APP SENSOR NO. 1 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 0.45 of a volt and go above 4.6 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 TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
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