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Home >> Chevrolet >> 2000 >> Venture Value >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0410: Secondary Air Injection System >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Check if DTC P0412 or P0418 is set. Diagnose affected DTC(s). If DTC P0412 or P0418 is not set, go to next step.
  3. Check AIR pump relay switch feed fuse, located in underhood fuse block. If fuse is okay, go to next step. If fuse is blown, go to step  13.
  4. Using scan tool, command AIR pump on and off. If AIR pump turns on and off with each command, go to step  10. If AIR pump does not turn on and off with each command, go to next step.
  5. Observe AIR pump operation. If AIR pump runs continuously, go to step  16. If AIR pump does not run continuously, go to next step.
  6. Disconnect AIR pump relay. Using a test light connected to ground, probe relay switch feed circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step  17.
  7. Using a fused jumper wire, jumper relay switch feed circuit to AIR pump feed circuit. If AIR pump operates, go to step  25. If AIR pump does not operate, go to next step.
  8. Leave the fused jumper wire in place. Disconnect AIR pump harness connector. Using test light connected to ground, probe AIR pump feed circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step  18.
  9. Connect a test light between AIR pump feed and ground circuit. If test light illuminates, go to step  27. If test light does not illuminate, go to step  19.
  10. Disconnect AIR hose/pipe from AIR pump. Using scan tool, command AIR pump on. If air flow is present at AIR pump outlet, go to next step. If air flow is not present at AIR pump outlet, go to step  28.
  11. Reconnect AIR hose/pipe to AIR pump. Disconnect AIR hose/pipe from AIR combination valve. Using scan tool, command AIR pump on. If air flow is present at AIR hose/pipe outlet, go to next step. If air flow is not present at AIR hose/pipe outlet, go to step  22.
  12. Start engine, check for vacuum at AIR combination valve. If vacuum is not present, check for damaged, pinched or disconnected vacuum line, a blocked/restricted vacuum port or a faulty vacuum control solenoid valve. Check for damaged, pinched or disconnected vacuum line between vacuum control solenoid and actuator diaphragm. Repair as necessary. After repairs, go to step  23. If no problems were found, go to step  26.
  13. Disconnect AIR pump relay. Check relay feed circuit for short to ground. Repair as necessary. After repairs, go to step  20. If circuit is okay, go to next step.
  14. Disconnect AIR pump. Check AIR pump feed circuit for short to ground. Repair as necessary. After repairs, go to step  21. If circuit is okay, go to next step.
  15. Reconnect AIR relay and AIR pump. Replace fuse. Using scan tool, command AIR pump on. Check fuse. If fuse blows, go to step  28. If fuse does not blow, see DIAGNOSTIC AIDS .
  16. Disconnect AIR pump relay. Observe AIR pump operation. If pump is still running, go to step  24. If pump stops running, go to step  25.
  17. Repair open relay switch feed circuit. After repairs, go to step  29.
  18. Check for an open in AIR pump feed circuit. Repair as necessary. After repairs, go to step  29. If circuit is okay, go to step  25.
  19. Repair open/high resistance in AIR pump ground circuit. After repairs, go to step  29.
  20. Repair short to ground in relay switch feed circuit. After repairs, go to step  29.
  21. Repair short to ground in AIR pump feed circuit. After repairs, go to step  29.
  22. Check for blocked or damaged combination valve. Check for restriction, blockage, disconnected or other damage to AIR hoses/pipes from combination valve to exhaust system. Repair as necessary. After repairs, go to step  29.
  23. Repair the vacuum system as necessary. After repairs, go to step  29.
  24. Repair short to voltage in AIR pump feed circuit. After repairs, go to step  29.
  25. Replace AIR pump relay. After replacing relay, go to step  29.
  26. Replace affected AIR combination valve. After replacing combination valve, go to step  29.
  27. Check for poor connections at AIR pump. Repair as necessary. After repairs, go to step  29. If connections are okay, go to next step.
  28. Replace AIR pump. After replacing AIR pump, go to step  29.
  29. Using scan tool, clear DTCs. Turn ignition off and wait 15 seconds. Operate vehicle within conditions required for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  30. Using scan tool, review CAPTURED INFO. Recheck for DTCs. If any other DTC(s) are set, diagnose affected DTC(s). If no DTC(s) are set, system is okay.
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