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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0638 To DTC P2635 >> DTC P0641-P0643, P0651-P0653, or P0697-P0699 >> Circuit/System Testing

Circuit/System Testing

    NOTE: Additional DTCs will set when disconnecting the components.
  1. Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids .
  2. Ignition ON, test for 4.6-5.2 V between one of the affected 5-volt reference circuits and ground.
    • If the voltage is less than the specified range, test for an open between the ECM and the splice for all of the affected components. Or, test for a short to ground on the 5-volt reference circuit for each of the affected components. If all circuits test normal, replace the ECM.
    • If the voltage is greater than the specified range, test for a short to voltage on the 5-volt reference circuit for each of the affected components. If all circuits test normal, replace the ECM.
    3. NOTE: A short to voltage on the signal circuit of certain components may cause this DTC to set.
  3. Connect each component associated with the affected 5-volt reference circuit one at a time while monitoring the appropriate scan tool 5-Volt Reference Circuit Status parameter. The parameter should continue to display OK.
    • If the parameter displays Fault when a component is connected, test the signal circuit of that component for a short to voltage. If the circuit tests normal, replace the component.
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