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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Controls - Self-Diagnostics - 4.0L) >> Diagnostic Tests >> P0412: Secondary Air Injection Solenoid Relay Control Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. 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. 4

    Listen for a click when the solenoid valve operates. Ensure that both the ON and the OFF states are commanded. Repeat the commands as necessary.

  2. 6

    This step tests for voltage to the AIR solenoid valve.

  3. 7

    This step verifies that the PCM is providing ground to the AIR solenoid valve.

  4. 8

    This step tests if a ground is constantly being applied to the AIR solenoid valve.
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