Hino P0605 Fault Code: Flash ROM Error

Technical Description

Engine ECU flash ROM failure is detected.

DTC Set Condition

DTC Detection Condition:

Starter switch ON.

Judgment Criteria:

• Flash ROM check sum error.
• 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: ON
• SVS light: OFF
• Engine output is restricted.
• Cruise control function is not available.
• Idling stop system is not available.
• Vehicle start control is not available.
• PTO is not available.

Symptoms On The Vehicle When The DTC Is Set

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

• Engine output is insufficient.
• Cruise control does not work.
• Idling stop system does not work.
• Vehicle start control does not work.
• PTO cannot be used.

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 stored 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] 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 P0605 has been detected.

Has DTC P0605 been detected?

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