| Symptom of malfunction | - |
| Output limit, etc. | Without |
| Malfunction indicator light | Light out |
| Multi information | Inspect the DPR. |
| Possible cause of malfunction | DPR clogged with soot, excessive emission of black smoke from engine, malfunction of differential sensor or clogging/damage in piping |
Detail
- Inspect the DPR differential pressure pipe.
Standard: No blockage is allowed.
NO
Clean the pipe.YES
Proceed to [2] Inspecting the DPR
- Remove the DPR and inspect the rear end face.
Standard: No soot leakage is allowed.
NO
Replace DPR.YES
Proceed to [3] Inspecting the DPR
- Inspect the front end face of the DPR.
Standard: No blockage is allowed in front of the catalyst.
NO
Replace DPR.YES
Proceed to [4] Inspecting the DPR
- With the DPR removed, check that a large volume of black smoke is not produced.
NO
Inspect the engine system.YES
Proceed to [5] Inspecting the DPR differential pressure sensor
- Set the starter key to the "LOCK" position and disconnect the DPR differential pressure sensor connector.
- Measure resistance between the 1st and 3rd terminals of the DPR differential pressure sensor connector (component side).
Standard value: 2 Ω or less
NO
Replace the DPR differential pressure sensor.YES
Proceed to [6] Basic engine inspection
- Air-wash the DPR and install the muffler. Perform a basic engine inspection (injection rate inspection).
Standard: The standard injection rate must be met.
NO
Inspect the exhaust brake and adjust an injection rate.YES
Proceed to [7] DPR forced regeneration
- Perform a DPR forced regeneration.
Standard: Regeneration must not be completed.
NO
Replace DPR.YES
Proceed to [8] Inspecting differential pressure
- Inspect differential pressure.
NO
Replace DPR.YES
End of troubleshooting after deletion of diagnosis code
- Confirm the DTC P244B is inactive
- Start the engine and let it idling condition.
- Verify the DTC P244B is inactive.
- DTC Clear
- Clear the DTC with Hino DX
- Confirm the same DTC is not reoccurred
- P244B is reoccur: Return to first process
- Other DTC appear: Refer to concerned Trouble shooting
Complete
