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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Engine Controls And Fuel - 6.0L (L96) - DTC P0351 To DTC P2636 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0685, P0686, P0687, P0689, P0690 Or P1682: Engine Controls Ignition Relay/Ignition 1 Switch Circuit 2 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify no other DTCs are set.
    • Go to next step: If no other DTCs are set 
  3. Ignition - Cycle Off and On & Cycle On and Off

    Verify a click can be heard or felt at the component when it is turned On and Off: KR75 Engine Controls Ignition Relay

    • If a click cannot be heard or felt 

      Refer to Circuit/System Testing below

    • Go to next step: If a click can be heard or felt 
  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 below

    • 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 below

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