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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Engine Controls And Fuel - 2.0L - DTC P0243 To DTC P0690) >> DTC P0641-P0643, P0651-P0653, or P0697-P0699 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. 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 of all appropriate sensors for the applicable DTC.
    2. NOTE: A short to voltage on the signal circuit of certain components may cause this DTC to set.
  2. Ignition ON, measure for 4.8-5.2 V between one of the 5 V reference circuits and ground.
    • If the voltage is less than the specified range, test for a short to ground on all the 5 V reference circuits. If all circuits test normal, replace the K20 ECM.
    • If the voltage is greater than the specified range, test for a short to voltage on all the 5 V reference circuits. If all circuits test normal, replace the K20 ECM.
  3. Connect each component associated with the 5 V reference circuit, one at a time, while monitoring the voltage. Verify the voltage remains between 4.8-5.2 V.
    • If the voltage display is not within the specified range when a component is connected, test the signal circuit for a short to voltage. If all circuits test normal, replace the component.
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