Expand All| Criterion for determining | Power supply voltage of below 10 V for continuous 2 seconds or more |
| Inspection area and possible cause |
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Detail
- Set the starter key to the "LOCK" position and disconnect the 26- pin connector of the air suspension ECU.
- Set the starter key to the "ACC" position and measure voltage between the 12th and 26th terminals of the 26-pin connector (vehicle harness side).
Standard value: 20 V or more
NO
Less than 20 V: [2] Measuring the battery voltageProceed to [3] Check the fuse
YES
Abnormality in air suspension ECU or improper connection of connector
- Measure voltage between the terminals of the battery.
Use care to avoid short-circuit.Standard value: 20 V or more
NO
Defective batteryYES
Disconnection of power supply harness, irregular contact, etc.
- Set the starter key to the "LOCK" position and check the fuse for air suspension ECU located in the fuse block.
Standard: No fusing
NO
Proceed to [4] Measuring continuity between terminals.YES
Proceed to [2] Measuring the battery voltage.
- Remove the fuse for air suspension ECU and measure continuity between the 13th and 25th terminals of the air suspension ECU 26-pin connector (vehicle harness side).
Standard: No fusing
NO
Abnormality in harness and fuseYES
Abnormality in air suspension ECU and fuse
- Confirm the DTC C3420 is inactive
- Start the engine and let it idling condition.
- Verify the DTC C3420 is inactive.
- DTC Clear
- Clear the DTC with Hino DX
- Confirm the same DTC is not reoccurred
- C3420 is reoccur: Return to first process
- Other DTC appear: Refer to concerned Trouble shooting
Complete
