Check Fuel Cap

The CHECK FUEL CAP indicator is used to indicate significant leaks in the fuel tank evaporative system due to a loose fuel cap. The instrument cluster is hard-wired to the PCM. Fuel tank pressure is monitored by the PCM and if a leak is detected, it signals a fault to the instrument cluster and provides a ground to illuminate the CHECK FUEL CAP indicator. Once the PCM has detected a loose fuel cap and the CHECK FUEL CAP indicator is illuminated, the indicator will remain illuminated until the fuel cap is secured and the vehicle has been running for several minutes or the ignition has been cycled once. For additional information, refer to SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV .