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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 P0418: Secondary Air Injection Pump Relay 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 on the diagnostic table.

  1. 6

    This step tests for voltage at the coil side of the AIR pump relay.

  2. 7

    This step verifies that the PCM is providing ground to the AIR pump relay.

  3. 8

    This step tests if a ground is constantly being applied to the AIR pump relay.
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