Hino Motors HINO 155 series Workshop Manual page 584

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7. After-inspection work
• Clear all past DTCs.
• Check that no DTC is detected after test drive.
8. Estimated failure factors
• +B short-circuit or disconnection in exhaust brake drive signal line.
• Malfunction of exhaust brake magnetic valve.
• Malfunction of engine ECU.
ENGINE (J05E)/TROUBLESHOOTING