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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (P0351 - P26C8) And Symptoms) >> Diagnostic Information And Procedures >> DTC P0685, P0686, P0687, P0689, P0690, Or P1682: Engine Controls Ignition Relay Control Circuit >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P0685, P0686, P0687, P0689, P0690, P1682 is not set.
    • If DTC P0685, P0686, P0687, P0689, P0690, P1682 is set 

      Refer to: Circuit/System Testing

    • Go to next step: If none of the DTCs are set 
  3. Ignition/Vehicle - Cycle On and Off

    Verify the component produces a clicking sound:KR75 Engine Controls Ignition Relay

    • If the component does not produce a sound 

      Refer to: Circuit/System Testing

    • Go to next step: If the component produces a sound 
  4. Verify the following parameters are within 3 V of each other:
    • Ignition 1 Signal
    • Engine Controls Ignition Relay Feedback Signal
    • If not within 3 V of each other 

      Refer to: Circuit/System Testing

    • Go to next step: If within 3 V of each other 
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  6. All OK.
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