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). A clicking sound 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.
2. 5
   
   This step verifies that the control module is providing ground to the EVAP purge valve.
3. 6
   
   This step tests if a ground is constantly being applied to the EVAP purge valve.