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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 119 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P0418: Air Pump Relay Control Circuit >> Test Description
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Test Description

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. 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. 5

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

  2. 6

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

  3. 7

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