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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 P0418: Secondary Air Injection Pump Relay 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. 2

    Listen for a click when the relay operates. Command both the ON and OFF states. Repeat the commands as necessary.

  2. 3

    This step tests for voltage at the switch feed.

  3. 4

    This step verifies that the control module is providing a ground.

  4. 5

    This step tests if ground is constantly being applied.
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