Code 31
WARNING: This page is about a different car, the 1995 Jeep Wrangler, 1995 Jeep Grand Cherokee, and 1995 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Scan tool displays EVAP SOLENOID CIRCUIT. Condition is: open or shorted condition detected in EVAP solenoid circuit (California Grand Cherokee with 4.0L engine only). MIL will come on.