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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 398 (Engine Controls - Self Diagnostics - 4.3L) >> Diagnostic Tests >> DTC P0443: EVAP Purge Solenoid Control Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. 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 procedures.

  1. 2

    This step tests if the concern is active. The EVAP solenoid is Pulse Width Module (PWM). You should hear a clicking sound when the purge solenoid is commanded to 50 percent. The clicking sound should stop when the EVAP purge solenoid is commanded to 0 percent. The rate at which the valve cycles should increase when the commanded state is increased, and decreased when the command state is decreased. Repeat the commands as necessary.

  2. 5

    This step verifies that the control module is providing ground to the EVAP purge solenoid.

  3. 6

    This step tests if a ground is constantly being applied to the EVAP purge solenoid.

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