Dtc: P208B Def Pump Motor - Functional - Hino 238 Workshop Manual

5–190
DTC: P208B

DTC: P208B DEF pump motor - functional

INFORMATION
(PMP+)
(PMPS)
(PMV+)
DCU
(PSR+)
(PSRS)
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.
DEF SCR SYSTEM (DCU)
LFJ
LFL
LFK
(PMP-)
LFM
LFN
(PMV-)
LFQ
LFR
LFP
(PSR-)
LG8
(PMP+)
LG9
(PMPS)
LGA
(PMP-)
LGB
(PMV+)
LGC
(PMV-)
Supply module
(DEF pump)
LGD
(PSR+)
LGE
(PSRS)
LGF
(PSR-)
EN01H16F02040F03001040
SAPH16F020400122