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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P0412: Secondary Air Injection Relay Control Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. 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

    Listen for an audible click when the solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.

  2. 3

    This step tests for voltage at the 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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