Hino P0606 Fault Code: Control Module Processor

Technical Description

Engine ECU internal failure is detected.

DTC Set Condition

Starter switch ON.

Judgment Criteria:

• IC for monitoring microcomputer failure inside ECU is detected.
• Failure determination time ≥ 96 m/sec.

Reset Condition

After restoration to normal condition and starter switch “OFF”.

Indication, Warning Or System Control Regulation When The DTC Is Set

• MIL: OFF
• SVS light: ON
• Engine is stopped.

Symptoms On The Vehicle When The DTC Is Set

Symptoms on the Vehicle Due to Backup Control (Fail Safe Function)

Engine is stopped.

Symptoms on the Vehicle Due to Malfunction:

Engine is stalled.

Pre – Inspection Work

Check that the battery voltage is in the normal range.

After – Inspection Work

• Clear all past DTCs.
• Check that no DTC is detected after test drive.

Possible Causes

• Malfunction of engine ECU circuit.
• Temporary malfunction caused by radio wave interference or noise.

Inspection Procedure

Troubleshooting Steps

Step 1) Inspect the engine ECU circuit [Diagnostic Tool].

1. Connect the vehicle to the diagnostic tool.
2. Set the starter switch to the “ON” position.
3. Select [Engine] in the diagnostic tool menu and check the communication between the diagnostic tool

and the engine ECU.

4. Erase the trouble history.
5. Set the starter switch to the “LOCK” position.
6. Make sure the engine ECU main relay is OFF in the diagnostic tool menu. (This cuts off the

communication between the diagnostic tool and the engine ECU).

7. Set the starter switch to the “ON” position.
8. Select [Engine] and check if P0606 has been detected.

Has DTC P0606 been detected?

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