Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 2
   
   This step tests if the concern is active. The EVAP purge valve is Pulse Width Modulated (PWM). You should hear a clicking sound when the purge valve is commanded to 50 percent. The clicking sound should stop when the EVAP purge valve is commanded to 0 percent. The rate at which the valve cycles should increase when the commanded state is increased, and decrease when the commanded state is decreased. Repeat the commands as necessary.
2. 2
   
   This step tests if the concern is active. The EVAP purge valve is PWM. A clicking should be heard or felt when the purge valve is commanded to 50 percent and should stop when the EVAP purge valve is commanded to 0 percent. The rate at which the valve cycles should increase as the commanded state is increased and decrease as the commanded state is decreased. Repeat the commands as necessary.
3. 5
   
   This step tests if a ground is constantly being applied to the EVAP purge valve.
4. 6
   
   This step verifies that the control module is providing ground to the EVAP purge valve.