Hino Motors HINO 155 series Workshop Manual page 283

7. After-inspection work
• Clear all past DTCs.
• Check that no DTC is stored after test drive.
8. Estimated failure factors
Engine coolant temperature sensor:
• Short-circuit in the sensor
• Abnormal resistance of sensor
• Failure in engine ECU sensor power supply
• Disconnection or short-circuit in sensor harness
• Irregular contact
ENGINE (J05E)/TROUBLESHOOTING 2–247