Hino 238, Workshop Manual

Page: 756 / 919

DEF SCR SYSTEM (DCU) 5–190
DTC: P208B
EN01H16F02040F03001040
DTC: P208B DEF pump motor - functional
INFORMATION
1. Technical description
•
DEF pump motor is used to send DEF to the DEF injector.
• DEF pump motor operates according to the command values from DCU.
<Description of malfunction>
• Motor malfunction of DEF pump is detected.
2. DTC set condition
(1) DTC detection condition
Engine is running.
DEF has finished thawing and SCR inlet temperature
>
150

C {302

F}
(2) Judgement criteria
|Target pump speed
–
actual speed|
>
300 rpm for 5 sec. continuously.
3. Reset condition
•
After having restored to the normal conditions.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
•
DEF injection is stopped.
• NOx purification function is stopped.
5. Symptoms on the vehicle when the DTC is set
<Symptoms on the vehicle due to backup control (fail safe function)>
•
Exhaust gas purification function has deteriorated.
<Symptoms on the vehicle due to malfunction>
•
–
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.
8. Estimated failure factors
• DEF pump motor malfunction.
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
SAPH16F020400122