Pinpoint Test 21

PINPOINT TEST 21: THE CHECK FUEL CAP INDICATOR IS NEVER ON

Step 1 - 3:

Normal Operation
The 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 inHg) of vacuum within 30 seconds after refueling has occurred, or there is excessive purge (fuel vapor) flow greater than 454 g (0.06 Ib) per minute, the PCM will set DTC P0457 and send a message to the instrument cluster over the CAN circuits, to turn on the check fuel indicator.

Possible Causes
- PCM
- instrument cluster