Dtc: P1515 Charge Air Undercooling - Hino 238 Workshop Manual

DTC: P1515
P1515: Charge air undercooling
INFORMATION
1. Technical description
• The intercooler cooling efficiency is monitored by comparing the intake temperature and intercooler outlet tempera-
ture measured by the air flow sensor.
<Description of malfunction>
• Intercooler cooling efficiency drop is detected.
2. DTC set condition
(1) DTC detection condition
• Engine is running (not stopped).
(2) Judgement criteria
• The intake temperature is -15 C {5 F} and the intercooler outlet temperature is ≥ 74 C {165 F}.
• The intake temperature is 65 C {149 F} and the intercooler outlet temperature is ≥ 146 C {295 F}.
3. Reset condition
• Just after restoration to normal condition.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
• Diag lamp: 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 CONTROL SYSTEM (J08E) 4–895
EN01H16F01030F03001115