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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 378 (Engine Controls Self-Diagnostics - 3.1L Engine) >> Diagnostic Tests >> DTC P0443: EVAP Purge Solenoid Control Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

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

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

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