Hino P0603 Fault Code: Engine ECU EEPROM Fault
Technical Description
The QR compensation value is written with the same data into three areas of the engine ECU EEPROM storage; an EEPROM fault is detected when the stored date does not match.
DTC Set Condition
DTC Detection Condition:
- Starter switch ON.
- Battery voltage is in the range of 10 V to 16 V.
Judgment Criteria:
EEPROM failure: Data saved in the 3 EEPROM sectors do not match.
Reset Condition
Immediately after restoration to normal condition.
Indication, Warning Or System Control Regulation When The DTC Is Set
- MIL: ON
- SVS light: OFF
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
Engine ECU failure.
Inspection Procedure
Troubleshooting Steps
Step 1) Check injector replaced record.
Check injector replaced record.
Does the injector have a replacement record?
| Yes – When it has a record or unclear.
Go to Step 3. |
No – When it has not a record.
Go to Step 2. |
Step 2) Inspection of QR code [Diagnostic Tool].
- Re-input the registration QR code data of the service server.
- Erase the DTC memory, and recheck DTC code. Confirm that DTC code P0603 is not detected.
Has DTC P0603 been detected?
| Yes – Go to Step 3. | No – Procedure completed.
Clear all past DTCs. Check that no DTC is detected after test drive. |
Step 3) Inspection of QR code [Diagnostic Tool].
- Read the QR code date of the injectors by using the diagnostic tool, re-input QR code data.
- Erase the DTC memory, and recheck DTC code. Confirm that DTC code P0603 is not detected.
Has DTC P0603 been detected?
| Yes – Replace the engine ECU.
Clear all past DTCs. Check that no DTC is detected after test drive. |
No – Procedure completed.
Clear all past DTCs. Check that no DTC is detected after test drive. |
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