Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
If there are any 5-Volt supply DTCs present, repair those DTCs before proceeding.
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 75 seconds.
5. Turn the ignition on.
6. With the scan tool, read DTCs.
  Did the DTC reset?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE (K181) SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Identifying Fuel Rail Pressure Sensor Harness Connector Terminals
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Fuel Pressure Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (K181) FPS Signal circuit at the Fuel Pressure Sensor harness connector.
  Is the reading above 5.2 volts?
  
  Yes
  - Repair the (K181) FPS Signal circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3.
CHECK FOR THE (K181) SIGNAL CIRCUIT SHORTED TO THE (F857) 5-VOLT SUPPLY CIRCUIT

Fig 2: Fuel Rail Pressure Sensor Connector Pin ID
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnected PCM C1 harness connector.
3. Measure the resistance between the (K181) FPS Signal circuit and the (F857) 5-Volt Supply circuit at the Fuel Pressure Sensor harness connector.
  Is the resistance below 10k Ohms?
  
  Yes
  - Repair the short between the (K181) FPS Signal circuit and the (F857) 5-Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 4.
CHECK THE (K181) SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 3: Checking Signal Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K181) FPS Signal circuit between the Fuel Pressure Sensor harness connector and the PCM C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5.
  No
  - Repair the (K181) FPS Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K916) SENSOR GROUND FOR AN OPEN/HIGH RESISTANCE

Fig 4: Checking Sensor Ground Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K916) Sensor Ground circuit between the Fuel Pressure Sensor harness connector and the PCM C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the (K916) Sensor Ground circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE FUEL PRESSURE SENSOR

Fig 5: Identifying Fuel Rail Pressure Sensor Harness Connector Terminals
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Reconnect the PCM C1 harness connector.
3. Reconnect the Fuel Pressure Sensor harness connector.
4. Turn the ignition on.
5. With the scan tool, erase DTCs.
6. While monitoring scan tool, connect a jumper between the (K181) FPS Signal circuit and the (K916) Sensor Ground circuit at the Fuel Pressure Sensor harness connector.
  Does the DTC P0192 set?
  
  Yes
  - Replace the Fuel Pressure Sensor in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Replace and program the Powertrain Control Module in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .