P0686: Ecm/Pcm Power Relay Control Circuit High; Dtc: P0686 - Hino Motors HINO 155 series Workshop Manual

2–702

DTC: P0686

P0686: ECM/PCM Power Relay Control Circuit high

INFORMATION
1. Technical description
• The main relay (EDU relay) supplies power from the battery to the ECU.
<Description of malfunction>
• The main relay cannot be turned OFF.
2. DTC set condition
(1) DTC detection condition
• Battery voltage is in the range of 10 V to 16 V.
(2) Judgement criteria
• With the main relay in OFF position, 8 V or higher power supply voltage remains for 60 seconds.
3. Reset condition
• After restoration to normal condition.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: OFF
• SVS light: ON
ENGINE (J05E)/TROUBLESHOOTING
YRC
(INJ)
YRD
(IREL)
EDU relay
Engine ECU
YRA
X04
(B)
(L )
YRB
(B2)
EN01H02127030602016115
SHTS021270300642