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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Engine Controls And Fuel - 4.3L (LV1) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0685-P0687, P0689, P0690, or P1682 >> 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 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 the scan tool control function was commanded : KR75 Engine Controls Ignition Relay

    • If a click cannot be heard or felt 

      Refer to : Circuit/System Testing

    • 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

    • 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 does not set 
  6. All OK.
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