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.
An accurate indication of fuel level is required for PCM to properly pass or fail this DTC. Always diagnose fuel level sensor DTCs before performing this DTC test. Always check for fuel level sensor DTCs stored as history.
Perform physical inspection of EVAP system. Check the following items:
- Battery voltage 10.5-18.0 volts.
- Fuel level 15-85 percent of full capacity.
- ECT 38-95°F (3.5-35°C).
- Loose, missing, defective, or incorrect fuel tank cap.
- Incorrectly routed or defective EVAP system vacuum and vapor lines.
- A malfunctioning or damaged EVAP vapor canister.
- Check for charcoal release from EVAP vapor canister.