| Symptom of malfunction |
|
| Output limit, etc. | Output limit |
| Malfunction indicator light | Light out |
| Multi information | Engine system failure |
| Possible cause of malfunction | - |
| Symptom of malfunction |
|
| Output limit, etc. | Output limit |
| Malfunction indicator light | Light out |
| Multi information | Engine system failure |
| Possible cause of malfunction | - |
Detail
- Check if fuel used is suitable for ambient temperature.
NO
Replace with fuel suitable for ambient temperature.
YES
Proceed to [2] Checking a remaining fuel level
- Check whether there is enough fuel left.
NO
Add fuel (at least to the extent that the fuel level warning light lights out).
YES
Proceed to [3] Inspecting the fuel inlet port
- Check that no foreign matters remain around the fuel inlet port in the fuel tank.
NO
Remove foreign matters.
YES
Proceed to [4] Inspecting fuel piping
- Check all fuel pipings for crushing or foreign matters clogged in the pipings.
NO
Remove all foreign matters or replace crushed pipings.
YES
Proceed to [5] Inspecting a fuel filter
- Check the fuel filter for clogging.
NO
Replace filter paper.
YES
Proceed to [6] Inspecting fuel piping
- Check for fuel leakage or air intake from the fuel filter connection.
Looseness in the air bleed valve for the fuel filter may also constitute a cause of air intake.
NO
Properly connect and tighten.
YES
Proceed to [7] Inspecting fuel piping
- Check for entry of a large volume of air into the fuel piping.
There are various potential causes such as insufficient air bleeding during component/part replacement, fuel shortage and air intake from pipe connection.
NO
Bleed air.
YES
Proceed to [8] Inspecting a harness
- Waggle a harness connected to the common rail pressure sensor to check for disconnection (or sign of disconnection).
Standard: Common rail pressure must not show any fluctuations relative to harness waggling.
It is desirable to use HINO-DX to check common rail pressure in this inspection step.
NO
Disconnection of the harness
YES
Proceed to [9] Inspecting the common rail pressure sensor
- Inspect the common rail pressure sensor.
Standard: Base metals of terminals must not be exposed.
NO
Replace the common rail pressure sensor and its mating harness.
YES
Proceed to [10] Inspecting the pressure limiter
- Check that a pressure limiter is normally open and does not send fuel back from the common rail.
NO
Replace the pressure limiter.
YES
Proceed to [11] Inspecting a harness
- Use a tester or an oscilloscope to inspect a harness connected to the supply pump PCVs.
Standard: The same electrical signals are sent to both PCVs.
NO
Faulty harness
YES
Proceed to [12] Inspecting fuel piping
- Check for entry of a large volume of air into the fuel piping.
There are various potential causes such as insufficient air bleeding during component/part replacement, fuel shortage and air intake from pipe connection.
NO
Bleed air.
YES
For further detailed diagnosis, use the HINO-DX.
- Confirm the DTC P0087 is inactive
- Start the engine and let it idling condition.
- Verify the DTC P0087 is inactive.
- DTC Clear
- Clear the DTC with Hino DX
- Confirm the same DTC is not reoccurred
- P0087 is reoccur: Return to first process
- Other DTC appear: Refer to concerned Trouble shooting
Complete
