| Symptom of malfunction | The engine does not start running. |
| Output limit, etc. | Without |
| Malfunction indicator light | Light out |
| Multi information | Post-driving engine inspection |
| Possible cause of malfunction | Harness disconnection or +B short-circuit between engine ECU and immobilizer ECU |
Detail
- Set the starter key to the "LOCK" position and connect the signal check harness.
- Turn the starter key "ON" and connect an oscilloscope (voltage axis: 5 V/DIV, time axis: 50 msec/DIV) between the terminals E61 and V40 of the signal check harness to measure voltage between the terminals.
ECU terminal No. Description of terminal Standard: Displayed waveforms must be correct (0-12 V pulse).
This illustration provides a referential example of an oscilloscope waveform and does not take account of electromagnetic interference noise, chattering waveforms and other factors.
NO
If voltage between the terminals is constant at 8-12 V, disconnection or +B short-circuit is suspected in the harness between the engine ECU (IMI) and the immobilizer ECU (EFIO). Repair or replace the harness.
YES
Proceed to [2] Re-registering communication ID codes
- After replacement of the engine ECU, re-register communication ID codes.
NO
Immobilizer ECU failure. Take the steps as instructed below.
- Replace the immobilizer ECU.
- Re-register keys and communication ID codes.
YES
End
- Confirm the DTC B279A is inactive
- Start the engine and let it idling condition.
- Verify the DTCB279A is inactive.
- DTC Clear
- Clear the DTC with Hino DX
- Confirm the same DTC is not reoccurred
- B279A is reoccur: Return to first process
- Other DTC appear: Refer to concerned Trouble shooting
Complete
