Hino Motors HINO 155 series Workshop Manual page 675

7. After-inspection work
• Clear all past DTCs.
• Check that no DTC is stored after test drive.
8. Estimated failure factors
• Harness disconnection or short-circuit
• Looseness or poor contact of connector
• Supply pump (SCV) unit failure
• Engine ECU malfunction
ENGINE (J05E)/TROUBLESHOOTING 2–639