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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 421 (Engine Control System Self-Diagnostics - 3.8L) >> Diagnostic Tests >> DTC P0412: Secondary Air Injection Solenoid Control Circuit >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. 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. 1

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

  2. 2

    Listen for an audible click when the solenoid operates. Command both the on and off states. Repeat the commands as necessary.

  3. 3

    Tests for voltage at the feed side of the solenoid.

  4. 4

    Verifies that the PCM is providing ground to the solenoid.

  5. 5

    Tests if ground is constantly being applied to the solenoid.

  6. 12

    The PCM utilizes Electrically Erasable Programmable Read Only Memory (EEPROM). If the PCM is replaced, the new PCM must be programmed.
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