Hino Motors HINO 155 series Workshop Manual page 546

2–510
(2) Judgement criteria
• Judged when the calculated EGR cooler efficiency is less than 80%;
• If the values of difference between the calculated intake manifold air intake temperature and the actual intake
manifold air intake temperature) are as follows: If the EGR rate is 0%: the difference is 10 C {50 F} or more.
If the EGR rate is 20%: the difference is 17 C {62.6 F} or more. If the EGR rate is 60%: the difference is 60
C {140 F} or more. In addition;
• The calculated intercooler efficiencies are as follows. If the vehicle speed is 13 mile/h: the efficiency is higher
than 30%. If the vehicle speed is 25 mile/h: the efficiency is higher than 50%.
3. Reset condition
• After restoration to normal condition and starter key "LOCK"
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
• SVS light: OFF
5. Symptoms on the vehicle when the DTC is set
<Symptoms on the vehicle due to backup control (fail safe function)>
• –
<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
• Malfunction of intake air temperature sensor (intercooler outlet)
• Malfunction of intake air temperature sensor (intake manifold)
• Malfunction of boost pressure sensor
- Loose/disconnected sensor or failure in sensing area (contamination, clogging or damage)
- Abnormal resistance of sensor (stuck)
• Malfunction of engine ECU sensor power supply
ENGINE (J05E)/TROUBLESHOOTING