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: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.

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

Inspect the HO2S signal circuit for being shorted to a PCM ground. The HO2S signal circuit shorted to a PCM ground sets a switching DTC.
A malfunction in the HO2S heater circuits will cause a DTC P1133 or P1153 to set. Check the HO2S heater circuits for intermittent opens or for loose connections. An oxygen supply inside the HO2S is necessary for proper operation.
This supply of oxygen is provided through the HO2S wires. Inspect all HO2S wires and connections for breaks or for contamination.

If an intermittent condition is suspected, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.