ABNORMALITY IN COMMON RAIL PRESSURE - CONTROL SYSTEM
[CONTINUATION OF HIGH PRESSURE]
(DTC CODE P0088 / DIAGNOSIS MONITOR CODE 69)

1. The criterion to identify a symptom as an abnormality in this troubleshooting is whether actual common rail pressure exceeds target pressure by 15 MPa or more for a certain period of time when engine speed is 450 r/min or more without any other malfunctions detected as DTC codes P0628, P0629, P0088, P0191, P0192 and P0193 / diagnosis monitor codes 69, 72 and 74.
2. Use HINO-DX to check that no other diagnosis codes are output.Troubleshoot other output diagnosis codes, if any, so that these codes will not be output in this step.
3. Check set timing of the supply pump. Reinstall properly if not installed at the top dead center (0º).
4. If the above checks did not find any abnormalities, use the HINO-DX to delete past malfunctions and start the engine.
   If the same code is output again, potential causes may be a failure in the supply pump; a failure in the common rail pressure sensor; excessive fuel flow due to fuel supply system failure; a trouble of leakage inside the injectors; failures in engine ECU, harnesses and/or connectors.
   For further detailed diagnosis, use the HINO-DX.
   

1. Confirm the DTC P0088 is inactive

   • Start the engine and let it idling condition.
   • Verify the DTC P0088 is inactive.

   

2. DTC Clear

   • Clear the DTC with Hino DX
   • Confirm the same DTC is not reoccurred

   

P0088 is reoccur: Return to first process Other DTC appear: Refer to concerned Trouble shooting

Complete