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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 108 (Engine Controls Self-Diagnostics - 5.7L Corvette) >> Diagnostic Tests >> DTC P0418: Air Pump Relay Control Circuit >> Test Description

Test Description

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The numbers below refer to the step numbers in the diagnostic procedures.

  1. 2

    Listen for a click when the relay operates. Command the ON state and the OFF state. Repeat the commands as necessary.

  2. 4

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

  3. 5

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

  4. 7

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

  5. 13

    If the control circuit and the connection at the PCM are okay, the PCM may be faulty.

  6. 14

    This DTC will not report a pass. The scan tool status for this DTC will not report a pass. The scan tool will only display if the diagnostic test fails. The repair is not complete if the scan tool indicates that the diagnostic test ran and failed.
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