Diagnostic Test
- CHECK THE HIGH PRESSURE FUEL SYSTEM
- Check that the high pressure fuel system is intact.
System is not intact?
Yes
- Go To 2
No
- Restore the system.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
- Check that the high pressure fuel system is intact.
- FUEL RAIL PRESSURE SENSOR AND CHECK PCM
- Check for loose, damaged or corroded connections on the Fuel Rail Pressure Sensor or on the PCM.
Are there any loose or damaged connections?
Yes
- Repair the wiring connections as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
No
- Go To 3
- Check for loose, damaged or corroded connections on the Fuel Rail Pressure Sensor or on the PCM.
- CHECK WIRING BETWEEN FUEL RAIL PRESSURE SENSOR AND PCM FOR AN OPEN/HIGH RESISTANCE
- Check the wiring for an open circuit or high resistance between the Fuel Rail Pressure Sensor and PIN 40 of the connector on the engine side of the PCM.
Is there a high resistance or open condition in the wiring?
Yes
- Repair the open circuit or high resistance in the wiring.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
No
- Go To 4
- Check the wiring for an open circuit or high resistance between the Fuel Rail Pressure Sensor and PIN 40 of the connector on the engine side of the PCM.
- CHECK WIRING BETWEEN FUEL RAIL PRESSURE SENSOR AND PCM FOR A SHORT
- Check for a short circuit in the wiring between the Fuel Rail Pressure Sensor and PIN 40 of the connector on the motor side of the PCM.
Is there a short circuit in the wiring?
Yes
- Repair the short circuit in the wiring.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
No
- Go To 5
- Check for a short circuit in the wiring between the Fuel Rail Pressure Sensor and PIN 40 of the connector on the motor side of the PCM.
- CHECK FUEL RAIL PRESSURE SENSOR OPERATION
- Check that the Fuel Rail Pressure Sensor is working correctly.
Is the operation of the Fuel Rail Pressure Sensor incorrect?
Yes
- Replace the Fuel Rail Pressure Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
No
- Go To 6
- Check that the Fuel Rail Pressure Sensor is working correctly.
- CHECK HIGH PRESSURE FUEL PUMP OPERATION
- Check that the High Pressure Fuel Pump is working correctly.
High Pressure Fuel Pump not working correctly
Yes
- End of diagnosis.
No
- Replace the High Pressure Fuel Pump.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
- Check that the High Pressure Fuel Pump is working correctly.