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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1149 (Engine Controls And Fuel - 3.6L - DTC P0496 To DTC P2235) >> DTC P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698 or P0699 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: 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 volts 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. 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 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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