DTC P0685 ECM/Pcm Power Relay Control Circuit /Open: DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item	Detecting Condition	Possible cause
DTC Strategy	Detects a short to ground, to battery or open circuit on the main relay	Poor Connection Open or short in control circuit. Faulty Main Relay Faulty PCM
Enable Conditions	Engine Running 11V ≤ Ignition Voltage ≤ 16V
Threshold value	Open or Short in circuit
Diagnosis Time	Continuous (More than 5sec. Failure for every 10 sec. test)
MIL On Condition	DTC only (NO MIL ON)

* If Main relay has a fault (ex. Open) while the engine is running, the DTCs, P0638/P0685/P1295/P2106, can happen at the same time.

< DTC Name >