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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 1.4L (LUJ, LUV) - DTC P0300 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0641, P0651, P0697 or P06A3: 5V Reference Circuit (ECM) >> Circuit/System Testing

Circuit/System Testing

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.
    • 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 the component for a short to ground or voltage. If the circuit tests normal, replace the component.

    • If OK is displayed after all components have been connected 
  5. All OK.
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