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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P0418: Secondary Air Injection Pump Relay Control Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 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 number in the diagnostic procedures.

  1. 1

    The Diagnostic System Check prompts you to complete some basic checks and store the Freeze Frame/Failure Records data on the scan tool.
  2. 2

    Listen for a click when the relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  3. 3

    This step tests for voltage at the feed circuit.
  4. 4

    This step verifies that the control module is providing a ground.
  5. 5

    This step tests if ground is constantly being applied.
  6. 12

    The control module utilizes electrically Erasable Programmable Read Only Memory (EEPROM). When the control module is replaced, the new control module must be programmed.