| Symptom of malfunction | - |
| Output limit, etc. | Without |
| Malfunction indicator light | Light out |
| Multi information | Inspect the DPR. |
| Possible cause of malfunction | Drop in injection rate of fuel injection system; malfunction of exhaust control valve; malfunction of D throttle valve, EGR or VNT in upstream of engine; first oxidation catalyst degraded/deteriorated by low-grade fuel; gas leak from exhaust pipe |
Detail
- Check inside the tail pipe and the rear end face of the DPR.
Standard: No soot leakage is allowed.
NO
Replace DPR.YES
Proceed to [2] Basic engine inspection
- Perform a basic engine inspection (injection rate inspection).
Standard: The standard injection rate must be met.
NO
Inspect the exhaust brake, adjust an injection rate and inspect the EGR and VNT systems.YES
Proceed to [3] Inspecting the exhaust temperature sensor (located before DPF)
- Disconnect the exhaust temperature sensor (located before DPF) connector.
- Measure resistance between the 1st and 2nd terminals of the exhaust temperature sensor (located before DPF) connector (component side).
Temperature in measurement (ºC {ºF}) Resistance
NO
Fault in exhaust temperature sensor (located before DPF)YES
Proceed to [4] Inspecting the exhaust system
- Inspect the exhaust system for gas leakage.
Standard: No gas leakage is allowed.
NO
Replace a gasket and retighten.YES
Proceed to [5] DPR forced regeneration
- Clean the DPR and perform a DPR forced regeneration.
Standard: Regeneration must be completed.
NO
Replace DPR.YES
End of troubleshooting after deletion of code
- Confirm the DTC P2458 is inactive
- Start the engine and let it idling condition.
- Verify the DTC P2458 is inactive.
- DTC Clear
- Clear the DTC with Hino DX
- Confirm the same DTC is not reoccurred
- P2458 is reoccur: Return to first process
- Other DTC appear: Refer to concerned Trouble shooting
Complete
