Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
If a 5-Volt reference DTC is present, repair that DTC before proceeding with this test.
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE FUEL RAIL PRESSURE SENSOR
1. Turn the ignition off.
2. Disconnect the FRPS harness connector.
3. Turn the ignition on.
4. With the scan tool, view DTCs.
  NOTE:
  The P018D-FUEL RAIL PRESSURE SENSOR CIRCUIT HIGH DTC should be active or pending with the harness connector unplugged.
  
  Does the DTC display as described above?
  
  Yes
  - Replace the Fuel Rail Pressure Sensor in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (K181) FUEL RAIL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the PCM C1 harness connector.
3. Check for continuity between ground and the (K181) FRPS Signal circuit in the FRPS harness connector.
  Is there continuity between ground and the (K181) FRPS Signal circuit?
  
  Yes
  - Repair the (K181) Fuel Rail Pressure Sensor Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK FOR THE (K181) FUEL RAIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND
1. Disconnect the PCM C2 harness connector.
2. Check for continuity between the (K181) FRPS Signal circuit and the (K900) Sensor Ground circuit at the FRPS harness connector.
  Is there continuity between the (K181) FRPS Signal circuit and the (K900) Sensor Ground circuit?
  
  Yes
  - Repair the short between the (K181) Fuel Rail Pressure Sensor Signal circuit and (K900) FRPS Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
POWERTRAIN CONTROL MODULE (PCM)
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. Verify that there is good pin to terminal contact in the Fuel Rail Pressure Sensor and Control Module connectors.
4. Perform any Technical Service Bulletins (TSBs) that may apply.
  Were there 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 in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL . Refer to PCM/ECM REPROGRAMMING - GAS .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .