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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> 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 does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. 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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