Test I: The Check Fuel Cap Warning Indicator Is Never On

PINPOINT TEST I: THE CHECK FUEL CAP WARNING INDICATOR IS NEVER ON

I1-I4:

I5-I7:

Normal Operation
The check fuel cap warning indicator is used to indicate leaks in the fuel tank evaporative system that exceed specifications. Fuel tank pressure is monitored by the powertrain control module (PCM) and if a leak is detected, the PCM signals a fault by grounding circuit 1907 (WH/LG) to the instrument cluster.

Possible Causes
- circuit 1907 (WH/LG) open, short to voltage, or short to ground
- instrument cluster
- PCM