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.
- Remove any debris from the Powertrain Control Module/Throttle Actuator Control module (PCM/TAC) connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing or replacing the modules. Verify that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM/TAC 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 harness or component terminals.
- Carbon build-up in the exhaust manifold may restrict the amount of air flow necessary to affect the HO2S voltage. If you suspect this condition, remove the air pipe from the manifold and inspect the passage.
- For an intermittent condition, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.
- Excessive exhaust system back pressure.
- Moisture, water, or debris ingestion into the AIR pump.
- Leaking check valves will leave traces of exhaust carbon in the AIR system.