Diagnostic Aids

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 DTC.

Perform physical inspection of EVAP system. Ensure that battery voltage is 10.5-17.5 volts, fuel level 15-85 percent of full capacity, ECT 38-95°F (3.5-35°C). Check for loose, missing, defective, or incorrect fuel tank cap, incorrectly routed or defective EVAP system vacuum and vapor lines. Check for malfunctioning or damaged EVAP vapor canister or for charcoal release from EVAP vapor canister.