Hino Motors HINO 155 series Workshop Manual page 236

2–200
5. Symptoms on the vehicle when the DTC is set
<Symptoms on the vehicle due to backup control (fail safe function)>
• EGR valve is fully closed.
<Symptoms on the vehicle due to malfunction>
• –
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 detected after test drive.
8. Estimated failure factors
• Sensor is disconnected from measuring site or sensing unit is malfunctioning (due to dirt, clogging, damage, etc.)
• EGR valve malfunction
• Diesel throttle valve malfunction
• Intercooler failure (due to dirt, clogging, etc.)
• Engine ECU sensor power supply (air flow sensor dedicated 12 V power supply) failure or internal circuit failure
ENGINE (J05E)/TROUBLESHOOTING