Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

DTC IS ACTIVE
NOTE:
If there are any Sensor Reference DTCs present, perform those diagnostic procedures before continuing with this test.
1. Ignition on, engine not running.
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 DTC .
CHECK THE (K350) 5-VOLT SUPPLY CIRCUIT VOLTAGE

Fig 1: Checking 5-Volt Supply Circuit Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Fuel Rail Pressure Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (K350) 5-Volt Supply circuit at the Fuel Rail Pressure Sensor harness connector.
  Is the voltage above 4.8 volts?
  
  Yes
  - Go To 3
  No
  - Repair the (K350) 5-Volt Supply circuit for an open circuit or a short to ground condition.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
FUEL PRESSURE SENSOR
1. Reconnect the Fuel Rail Pressure Sensor harness connector.
2. Turn the ignition on.
3. With the scan tool, erase DTCs.
4. Turn the ignition off.
5. Disconnect the Fuel Rail Pressure Sensor harness connector.
6. Turn the ignition on.
7. With the scan tool, select View DTCs.
  NOTE:
  The scan tool should display a P0193-Fuel Rail Pressure Sensor High DTC as active or pending with the connector unplugged.
  
  Does the scan tool display the DTC as described above?
  
  Yes
  - Replace the Fuel Rail Assembly in accordance with the service information. Refer to RAIL, FUEL, REMOVAL .
    NOTE:
    The Fuel Rail Pressure Sensor is not serviceable separate from the Fuel Rail Assembly.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (K181) FUEL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking Fuel Pressure Sensor Signal Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance between ground and the (K181) Fuel Rail Pressure Sensor Signal circuit at the Fuel Rail Pressure Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (K181) Fuel Rail Pressure Sensor Signal circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK FOR THE (K181) FUEL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K359) FUEL PRESSURE SENSOR GROUND CIRCUIT

Fig 3: Checking Fuel Rail Pressure Sensor Signal Circuit For A Short To FRP Sensor Ground Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (K181) Fuel Rail Pressure Sensor Signal circuit and the (K359) Fuel Rail Pressure Sensor Ground circuit at the Fuel Rail Pressure Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (K181) Fuel Rail Pressure Sensor Signal circuit for a short to the (K359) Fuel Rail Pressure Sensor Ground circuit.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
POWERTRAIN CONTROL MODULE
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Rail Pressure 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. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance the service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .