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Home › Chevrolet › 2008 › Aveo Base › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 1.6L - DTC P0630 To DTC P2282 › DTC P0641 or P0651 › Circuit/System Testing

Circuit/System Testing

    IMPORTANT: 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, test for 4.6-5.4 volts between one of the 5-volt reference circuits and ground.
    • If less than the specified range, test for a short to ground on all the 5-volt reference circuits. If all circuits test normal, replace the control module.
    • If greater than the specified range, test for a short to voltage on all the 5-volt reference circuits for each component associated with the appropriate 5-volt reference circuit. If all circuits test normal, replace the control module.
    3. IMPORTANT: A short to voltage on the signal circuit of certain components may cause this DTC to set.
  3. Connect each component associated with the 5-volt reference circuit one at a time while monitoring the scan tool 5 volt reference parameter. The voltage should not change greater than 0.5 volt.
    • If not within the specified range when a component is connected, replace the component.
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