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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 105 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P0403: EGR Valve Control Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Pontiac Aztek and 2002 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

  1. 4

    When using the scan tool to increment the EGR valve, increment the valve to 10 percent then to 0 percent. Repeat this process to see if the test lamp turns ON then OFF. If the test lamp stays ON after commanded to 0 percent, the EGR solenoid high control circuit is shorted to voltage.

  2. 5

    This step tests for an open in the ground circuit to the solenoid.

  3. 6

    This step tests if voltage is constantly being applied to the solenoid.
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