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Home >> Hyundai >> 2014 >> Azera Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) >> DTC P0685: ECM/PCM Power Relay Control Circuit/Open >> General Information >> DTC Detecting Condition
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General Information: DTC Detecting Condition

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

* If Main relay has a fault (ex. when the engine is running), the DTC's, P0638/P0685/P1295/P2106, can set at the same time.

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