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Home >> Cadillac >> 2002 >> Eldorado ETC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.6L >> Diagnostic Tests >> DTC P0412: Secondary Air Injection Relay Control Circuit >> Test Description

Test Description

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

  1. 4

    Listen for a click when the solenoid valve operates. Be sure that both the ON and the OFF states are commanded. Repeat the commands as necessary.
  2. 6

    This step tests for voltage to the AIR solenoid valve.
  3. 7

    This step verifies that the PCM is providing ground to the AIR solenoid valve.
  4. 8

    This step tests if a ground is constantly being applied to the AIR solenoid valve.