Hino 338 - DTC: P208 A DEF Pump Motor - Circuit (Open Load)

DEF SCR SYSTEM (DCU) 5–185
DTC: P208A
EN01H16F02040F03001039
DTC: P208A DEF pump motor - circuit (Open load)
INFORMATION
1. Technical description
• DCU determines failure of DEF pump motor based on DEF pump circuit voltage.
<Description of malfunction>
• Actuator malfunction of DEF pump module is detected.
2. DTC set condition
(1) DTC detection condition
Starter switch ON.
DEF pump module actuator Duty cycle > 0 %
(2) Judgement criteria
DEF pump module actuator voltage is in 2.7 V to 5 V range for 2 sec. or more.
3. Reset condition
• After having restored to the normal conditions.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
• SCR System failure lamp: ON
• DEF injection is stopped.
• NOx purification function is stopped.
• If malfunction does not improve within 500 miles: engine output is restricted.
• If malfunction does not improve within 2,000 miles: vehicle speed is restricted.
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.
• Engine output is insufficient (when malfunction does not improve within 500 miles)
• Vehicle does not speed up (when malfunction does not improve within 2,000 miles)
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
SAPH16F020400119