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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 67 (Engine Controls Self-Diagnostics - 4.3L) >> Diagnostic Tests >> DTC P0418: Air Pump Relay Control Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. 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 procedure.

  1. 2

    Listen for the AIR pump as it operates. Command both the ON and OFF states. Repeat the commands as necessary.

  2. 5

    Identify and test the relay coil terminals in order to avoid improper diagnosis.

  3. 14

    The repair is not complete if the scan tool indicates that the diagnostic ran and failed.
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