Hino Motors HINO 155 series Workshop Manual page 610

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Check the DTC detected (Engine ECU)
Has DTC P0504 been detected?
Replace the engine ECU.
Perform "After-inspection work" of INFOR-
MATION section.
ENGINE (J05E)/TROUBLESHOOTING
1. Set the starter key to the "LOCK" position.
Connect the vehicle to HINO DX Ⅱ .
2.
3. Set the starter key to the "ON" position.
4. Select [Engine] and check if P0504 have been detected.
SHTS021270300525
YES NO
Procedure completed.
Perform "After-inspection work" of INFOR-
MATION section.