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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.0L (LUZ) Diesel - DTC P0430 To DTC P2080) >> Diagnostic Information and Procedures >> DTC P0641, P0651 or P0697: 5V Reference Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE: Additional DTCs will set when disconnecting the components.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.
  2. Ignition ON.
  3. Test for 4.7-5.3 V between one of the 5V reference circuits and ground.
    • If less than 4.7 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 5.3 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 4.7-5.3 V 
  4. Verify the appropriate scan tool 5V Reference 1, 2 or 3 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 

      Replace the component.

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