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Home >> Cadillac >> 2002 >> Seville STS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.6L >> Diagnostic Tests >> DTC P0410: Secondary Air Injection System >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Is the AIR pump fuse okay? If yes, go to next step. If no, go to step  14.
  3. Did DTC P0412 or DTC P0418 also set? If yes, see DTC P0412: SECONDARY AIR INJECTION RELAY CONTROL CIRCUIT  or DTC P0418: SECONDARY AIR INJECTION PUMP RELAY CONTROL CIRCUIT  . If no, go to next step.
  4. Install the scan tool. Turn ON the ignition, with the engine OFF. Command the AIR system ON and OFF with a scan tool. Does the AIR pump turn ON and OFF? If yes, go to step  9. If no, go to next step.
  5. Turn OFF the ignition. Remove the AIR pump relay. Turn ON the ignition, with the engine OFF. Probe the AIR pump relay battery voltage supply circuit terminal on the switch side of the relay using the Test Lamp (J 34142-B) connected to a good ground. Does the test lamp illuminate? If yes, go to next step. If no, go to step  16.
  6. Jumper the battery voltage terminal to the AIR pump feed circuit at the relay harness connector using a fused maxi 40-amp jumper wire. Does the AIR pump turn ON? If yes, go to step  22. If no, go to next step.
  7. Ensure that the jumper still installed. Disconnect the AIR pump electrical connector. Probe the AIR Pump Supply Voltage circuit at the AIR pump electrical connector using the Test Lamp (J 34142-B) connected to battery ground. Does the test lamp illuminate? If yes, go to next step. If no, go to step  17.
  8. Connect the Test Lamp (J 34142-B) between the AIR Pump Supply Voltage circuit and the ground circuit of the AIR pump harness connector. Does the test lamp illuminate? If yes, go to step  24. If no, go to step  18.
  9. Disconnect the vacuum source from the AIR solenoid valve. Connect a vacuum gauge to the vacuum source. Start and idle the engine. Does the vacuum gauge display engine vacuum? If yes, go to next step. If no, go to step  21.
  10. Turn OFF the ignition. Connect the vacuum source to the AIR solenoid valve. Disconnect the vacuum hose to the AIR shut-off valves at the AIR solenoid valve. Connect a vacuum gauge to the AIR solenoid valve port. Start and idle the engine. Command the AIR system ON with a scan tool. Does the vacuum gauge display engine vacuum? If yes, go to next step. If no, go to step  23.
  11. Inspect the vacuum lines to each AIR shut-off valve for the following conditions:
    • Kinks.
    • Restrictions.
    • Poor connections.
    • Damage.
    • Leaks.

    Did you find and correct the condition? If yes, go to step  21. If no, go to next step.

  12. Disconnect both AIR intermediate hoses/pipes from the AIR shut-off valves. Start and idle the engine. Command the AIR system ON with a scan tool. Is air pressure present at both hoses? If yes, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  13. Inspect for restrictions, poor connections, or damage at the following locations:
    • The AIR inlet hose and AIR outlet hose from the AIR pump.
    • The AIR intermediate hoses/pipes.
    • The AIR crossover hose/pipe.
    • The AIR pump.

    Repair as necessary. Did you find and correct the condition? If yes, go to step  26. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.

  14. Turn OFF the ignition. Remove the AIR pump relay from the underhood electrical center. Remove the AIR pump fuse from the underhood electrical center. Probe the battery feed terminal for the AIR pump relay harness connector with the Test Lamp (J 34142-B) connected to battery voltage. Does the test lamp illuminate? If yes, go to step  19. If no, go to next step.
  15. Disconnect the AIR pump harness connector at the pump. Probe the AIR pump supply voltage circuit at the harness connector with the Test Lamp (J 34142-B) connected to battery voltage. Does the test lamp illuminate? If yes, go to step  20. If no, go to step  25.
  16. Repair the open circuit between the fuse and the relay. After repairs, go to step  26.
  17. Repair the open circuit between the AIR pump and the AIR pump relay. After repairs, go to step  26.
  18. Repair the poor ground connection or the open ground circuit. After repairs, go to step  26.
  19. Repair the short to ground in the ignition feed circuit. After repairs, go to step  26.
  20. Repair the short to ground in the circuit between the AIR pump relay and the AIR pump. After repairs, go to step  26.
  21. Replace the vacuum hose or vacuum check valve as necessary. After repairs, go to step  26.
  22. Replace the AIR pump relay. After repairs, go to step  26.
  23. Replace the AIR solenoid valve. After repairs, go to step  26.
  24. Inspect for poor connections at the AIR pump electrical connector. Repair the poor connection as necessary. Did you find and correct the condition? If yes, go to step  26. If no, go to next step.
  25. Replace the AIR pump. After repairs, go to step  26.
  26. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC as specified in the supporting text. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  27. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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