Hino Motors HINO 155 series Workshop Manual page 785

6. Pre-inspection work
• Check that the battery voltage is in the normal range.
7. After-inspection work
• Clear all past DTCs.
• Check that no DTC is stored after test drive.
8. Estimated failure factors
• Loose/disconnected sensor and failure in sensing area (contamination or clogging)
• Abnormality in resistance of sensor (stuck)
• Malfunction of engine ECU sensor power supply or internal circuit
ENGINE (J05E)/TROUBLESHOOTING 2–749