Test X: The Check Fuel Cap Indicator Is Never/Always On

PINPOINT TEST X: THE CHECK FUEL CAP INDICATOR IS NEVER/ALWAYS ON

X1-X2:

X3:

Normal Operation
The powertrain control module (PCM) monitors the fuel tank evaporative system for significant leaks that occur following refueling of the vehicle. If a fuel tank pressure change greater than a -23.7 kPa (7 in Hg) of vacuum occurs within 30 seconds after refueling, or there is an excessive purge (fuel vapor) flow greater than 454 g (0.06 lb) per minute, the PCM sets diagnostic trouble code (DTC) P0457 and sends a message to the instrument cluster over the communication network to illuminate the check fuel cap indicator.

Possible Causes
- PCM
- instrument cluster