Hino Motors HINO 155 series Workshop Manual page 631

ENGINE (J05E)/TROUBLESHOOTING 2–595
8. Estimated failure factors
Exhaust gas temperature sensor (DOC1 inlet):
• Loose/disconnected sensor or failure in sensing area (contamination, clogging or breakage)
• Abnormal resistance of sensor
• Failure in engine ECU sensor power supply
• Disconnection or short-circuit in sensor harness
• Irregular contact (disconnection or poor fit of connector)