Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

DTC IS ACTIVE
NOTE:
Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.
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 hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
2. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
(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 GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Accelerator Pedal Position Sensor harness connector.
3. Disconnect the Powertrain Control Module (PCM) C1 harness connector.
4. Turn the ignition on.
5. Measure the voltage of the (K852) 5 Volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (K852) 5 Volt Supply circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3.
(K23) APP SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE

Fig 2: Measuring Voltage Of APP Signal 1 Circuit In Accelerator Pedal Position Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage of the (K23) APP Signal 1 circuit in the Accelerator Pedal Position Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (K23) APP Signal 1 circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4.
(K23) APP SIGNAL 1 CIRCUIT SHORTED TO THE (K852) 5 VOLT SUPPLY CIRCUIT

Fig 3: Measuring Resistance Between APP Signal Circuit And 5-Volt Supply Circuit In APP Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (K23) APP Signal 1 circuit and the (K852) 5 Volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the (K23) APP Signal 1 circuit for a short to the (K852) 5 Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5.
(K23) APP SIGNAL 1 CIRCUIT SHORTED TO THE (K858) 5 VOLT SUPPLY CIRCUIT

Fig 4: Measuring Resistance Between APP Signal Circuit And 5-Volt Supply Circuit In APP Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (K23) APP Signal 1 circuit and the (K858) 5 Volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the (K23) APP Signal 1 circuit for a short to the (K858) 5 Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6.
(K23) APP SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE

Fig 5: Checking APP Signal 1 Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Measure the resistance of the (K23) APP Signal 1 circuit between the Accelerator Pedal Position Sensor harness connector and the PCM C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 7.
  No
  - Repair the (K23) APP Signal 1 circuit for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(K167) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Fig 6: Checking Sensor Ground Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (K167) Sensor Ground circuit between the Accelerator Pedal Position Sensor harness connector and the PCM C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 8.
  No
  - Repair the (K167) Sensor Ground circuit for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
ACCELERATOR PEDAL POSITION SENSOR

Fig 7: Checking APP Sensor Circuit Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Connect the PCM C1 harness connector.
3. Connect a jumper wire between the (K167) Sensor Ground circuit and the (K23) APP Signal 1 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.
  Is the voltage below 1.0 volt with the jumper wire in place?
  
  Yes
  - Replace the Accelerator Pedal Position Sensor in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 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 POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, FUEL PUMP, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .