Diagnostic Aids

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

Using FREEZE FRAME and/or FAILURE RECORDS data may aid in locating intermittent condition. If DTC cannot be duplicated, information included in this data can be useful in determining how many miles since DTC has set.

The FAIL COUNTER and PASS COUNTER can also be used to determine how many ignition cycles diagnostic reported a pass and/or fail condition. Operate vehicle within same freeze frame conditions (RPM, load, vehicle speed, temperature, etc.) that are noted. This will isolate when DTC failed.

The heater diagnostic will only run on a cold start and only once per ignition cycle. Oxygen supply inside HO2S is necessary for proper operation and is provided through HO2S wires. Check all HO2S wires and connections for breaks or contamination.