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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 P0641, P0651, P0697 Or P06A3: 5V Reference (1-4) Circuit(s) (ECM) >> Circuit/System Testing

Circuit/System Testing

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.
NOTE: Additional DTCs will set when disconnecting the components.
  1. Ignition OFF, disconnect the harness connector at all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids .
  2. Ignition ON.
  3. Test for 4.8 - 5.2 V between one of the 5V reference circuits and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connectors at the K20 Engine Control Module.
    2. Test for infinite resistance between the 5V reference circuit for each applicable component and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connectors at the K20 Engine Control Module.
    2. Test for less than 1 V between the 5V reference circuit for each applicable component and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • Go to next step: If between 4.8 - 5.2 V 
  4. Verify the appropriate scan tool 5V Reference 1, 2, 3 or 4 Circuit Status parameter displays OK while connecting each component associated with the 5V reference circuit one at a time.
    NOTE: A short to voltage or ground on the signal circuit of certain components may cause this DTC to set.
    • If OK is not displayed when a component is connected 

      Test the signal circuit of that component for a short to ground or voltage. If the circuit tests normal, replace the component.

    • Go to next step: If OK is displayed after all components have been connected 
  5. All OK.
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