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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the Q29 Secondary Air Injection Solenoid Valve.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the ground circuit terminal 4 and ground.
    • If greater than the specified range, repair the ground circuit for an open/high resistance.
  3. Connect a test lamp between the Q29 Secondary Air Injection Solenoid Valve ignition voltage circuit terminal 5 and ground.
  4. Ignition ON, command the Secondary Air Injection Solenoid Valve Open and Closed with a scan tool. The test lamp should respond to the scan tool commands.
    • If the test lamp is always OFF, test the ignition circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the Secondary Air Injection Solenoid Valve relay.
    • If the test lamp is always ON, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the Secondary Air Injection Solenoid Valve relay.
  5. Ignition OFF, remove the Q29 Secondary Air Injection Solenoid Valve.
  6. Connect the Q29 Secondary Air Injection Solenoid Valve harness connector.
  7. Ignition ON, command the Secondary Air Injection Solenoid Valve Open and Closed with a scan tool while observing the check valve assembly. The valve should open and close in response to the scan tool commands.
    • If the valve does not operate as specified, replace the Q29 Secondary Air Injection Solenoid Valve.
  8. Disconnect the Secondary Air Injection Pump hose/pipe from the Q29 Secondary Air Injection Solenoid Valve.
  9. Ignition ON, command the Secondary Air Injection Pump ON with a scan tool. Verify airflow to the Secondary Air Injection Solenoid Valve.
    • If there is limited or no airflow to the Secondary Air Injection Solenoid Valve, inspect for the following:
      • All Secondary Air Injection system Hoses/pipes for a restriction or blockage
      • Secondary Air Injection Pump Hose/pipe for leaks or loose connections
    • If a condition is located, repair or replace the affected component as necessary.
  10. If all circuits and hoses/pipes test normal, test or replace the Q29 Secondary Air Injection Solenoid Valve.
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