Diagnostic Test

DTC IS ACTIVE
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 hand near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.
  
  NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.
2. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 2
  No
  - Perform the CHECKING FOR AN INTERMITTENT DTC diagnostic procedure. Refer to Non-DTC Diagnostics/Driveability - Gas - Diagnosis and Testing .
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Fig 1: Measuring Voltage Of 5-Volt Supply Circuit In Accelerator Pedal Position Sensor Harness Connector
Courtesy of CHRYSLER 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 (F856) 5-volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (F856) 5-volt Supply circuit for a short to voltage.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 3
(K29) APP SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE

Fig 2: Measuring Voltage Of APP Signal Circuit In Accelerator Pedal Position Sensor Harness Connector
Courtesy of CHRYSLER 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 PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 4
(K29) APP SIGNAL 2 CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT

Fig 3: Measuring Resistance Between APP Signal Circuit And 5-Volt Supply In Accelerator Pedal Position Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K29) APP Signal 2 circuit and the (F856) 5-volt Supply in the Accelerator Pedal Position Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the (K29) APP Signal 2 circuit for a short to the (F856) 5-volt Supply circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 5
(K29) APP SIGNAL 2 CIRCUIT SHORTED TO THE (F852/F855) 5-VOLT SUPPLY CIRCUIT

Fig 4: Measuring Resistance Between APP Signal Circuit And 5-Volt Supply In Accelerator Pedal Position Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K29) APP Signal 2 circuit and the (F855) 5-volt Supply in the Accelerator Pedal Position Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the (K29) APP Signal 2 circuit for a short to the (F852/F855) 5-volt Supply circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 6
(K29) APP SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE

Fig 5: Measuring Resistance Of APP Signal Circuit Between Accelerator Pedal Position Sensor Harness Connector And Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
  CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 to perform diagnosis.
2. Measure the resistance of the (K29) APP Signal 2 between the Accelerator Pedal Position Sensor harness connector and the appropriate terminal of PCM Pinout Box 8815.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go to step 7
  No
  - Repair the (K29) APP Signal 2 for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K400) APP SENSOR GROUND 2 CIRCUIT OPEN OR HIGH RESISTANCE

Fig 6: Measuring Resistance Of APP Sensor Ground Circuit Between Accelerator Pedal Position Sensor Harness Connector And Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER LLC

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 to perform diagnosis.
1. Measure the resistance of the (K400) APP Sensor Ground 2 circuit between the Accelerator Pedal Position Sensor harness connector and the appropriate terminal of PCM Pinout Box 8815.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go to step 8
  No
  - Repair the (K400) APP Sensor Ground 2 circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
ACCELERATOR PEDAL POSITION SENSOR
1. Turn the ignition off.
2. Connect the Powertrain Control Module (PCM) connector.
3. Connect a jumper wire between the (K400) APP Sensor Ground 2 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.
  NOTE: The sensor voltage should be approximately 0.0 volts (plus or minus 0.1 of a volt) with the jumper wire in place.
  
  Does the scan tool display the voltage as described above?
  
  Yes
  - Replace the Accelerator Pedal Position Sensor in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 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
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .