Hino Motors HINO 155 series Workshop Manual page 848

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(2) Judgement criteria
The following conditions are detected.
• The detected intake manifold intake air temperature minus the actual intake manifold intake air temperature is
less than 10 C {50 F} if the EGR activation rate is 0%; less than 17 C {62.6 F} if the EGR activation rate is
less than 20%; or less than 60 C {140 F} if the EGR activation rate is 60%.
• The intercooler efficiency, which is calculated based on the air intake temperature sensor, boost pressure sen-
sor, and intercooler outlet temperature sensor and air pressure sensor, is less than 30% if the vehicle speed is
13 mile/ h or less than 50% if the vehicle speed is 25 mile/h.
3. Reset condition
• Just after restoration to normal condition
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
1. Insufficient cooling air
• Foreign substance clogging intercooler outer fins
• Foreign substance clogging radiator outer fins
• Deformed or clogged intercooler outer fin
• Deformed or clogged radiator outer fin
• Foreign substance clogging air inlet at front of vehicle
2. Faulty intercooler
• Tube abnormal swelling or cracking
3. Faulty part other than intercooler
• Engine cooling fan failure
• Fan clutch failure
• Clogged air cleaner
ENGINE (J05E)/TROUBLESHOOTING