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Diagnostic Aids

WARNING: This page is about a different car, the 2002 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before you service the PCM or the Throttle Actuator Control (TAC), remove any debris from the module connector surfaces, and from the module connector gaskets. Verify that the gaskets are correctly installed. The gaskets prevent debris from contaminating the modules.

For any test that requires probing the PCM or probing a component harness connector, use the Connector Test Adapter Kit J 35616-A. Using this kit prevents damage to the component terminals and to the harness.

  1. If the condition is intermittent, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  2. An intermittent may be caused by any of the following conditions:
    • Low system air flow may cause this DTC to set.
    • Excessive exhaust system back pressure.
    • Moisture, water or debris ingested into the AIR pump.
    • Pinched, kinked, heat damaged, or deteriorated hoses or vacuum lines.
    • Restrictions in the pump inlet, duct, or filter.
  3. An AIR pump that has become inoperative and shows signs of exhaust gases in the outlet port would indicate a check valve failure.
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