Hino 238, Workshop Manual

Page: 649 / 919

DEF SCR SYSTEM (DCU) 5–83
DTC: P142A
EN01H16F02040F03001022
DTC: P142A DEF pump temperature sensor 1 - out of range
INFORMATION
1. Technical description
• There are 2 temperature sensors in the DEF pump.
•
The DEF pump temperature sensor is judged with the DEF pump temperature sensor voltage by the DCU via har-
ness.
<Description of malfunction>
•
Failure of temperature sensor inside DEF pump is detected.
2. DTC set condition
(1) DTC detection condition
Engine ON.
(2) Judgement criteria
DEF Supply module Temperature Sensor duty:
–
Temperature sensor 1 duty: Below 15% for 5 sec. or longer
–
Tem-
perature sensor 1 duty: Over 85% for 5 sec. or longer
–
Temperature sensor 2 duty: Below 15% for 5 sec. or longer
–
Temperature sensor 2 duty: Over 85% for 5 sec. or longer
3. Reset condition
•
After having restored to the normal conditions.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
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>
•
Control will not work properly if the DEF freezes.
6. Pre-inspection work
• Check if the battery voltage is in the normal range.
7. After-inspection work
• Clear all past DTCs.
•
Check if no DTC is stored after test drive.
Supply module
(DEF pump)
DCU
LFQ
(PSR+)
LFR
LGD
(PSRS)
(PSR+)
(PSRS)
LFP LGF
(PSR-)
(PSR-)
LFJ
(PMP+)
LFL
LG8
(PMPS)
(PMP+)
(PMPS)
LFK LGA
(PMP-)
(PMP-)
LFM LGB
(PMV+)
(PMV+)
LFN LGC
(PMV-)
(PMV-)
LGE
LG9
SAPH16F020400056