Diagnostic Aids

NOTE: Leak Detection Pump module is also referred to as the Diagnostic Module Tank Leakage (DMTL). It incorporates a heater to dissipate condensation in the EVAP system.

Check for following possible problems:

Fuel filler cap loose or missing
Fuel filler cap seal missing or damaged
Faulty or damaged fuel filler pipe
Leaking, disconnected or plugged fuel vapor lines
Fuel getting into lines, due to faulty Rollover valve (RV) or On-board Refueling Vapor Recovery Valve (ORVR)
Improperly installed Purge Solenoid Valve (PSV)
PSV stuck open or closed
Leaking canister or catch tank
Faulty leak detection module solenoid valve
Faulty leak detection module