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 ECM
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.

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