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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 405 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0443: EVAP Purge Solenoid Control Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. 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 canister purge solenoid is Pulse Width Modulated (PWM). An audible clicking should be heard when the EVAP canister purge solenoid is commanded to 50 percent and should stop when the EVAP canister purge solenoid is commanded to zero percent. The rate at which the solenoid 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 tests if a ground is constantly being applied to the EVAP canister purge solenoid.

  3. 6

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

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