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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. NOTE: If DTC P0412 or P0418 are also set, refer to applicable DTC first. See DTC P0412: SECONDARY AIR INJECTION RELAY CONTROL CIRCUIT  or DTC P0418: SECONDARY AIR INJECTION PUMP RELAY CONTROL CIRCUIT  .
  2. Start the engine. Allow the engine to reach normal operating temperature in Closed Loop. Use a scan tool in order to command the AIR pump and solenoid ON, while observing the pre-catalyst HO2S voltage parameters. Does the scan tool indicate pre-catalyst HO2S voltages are below 50 mV for the duration of system operation? If yes, see DIAGNOSTIC AIDS . If no, go to next step.
    3. NOTE: If heat damage is indicated, replace the shut-off valve on the bank that the damage is present.
  3. Visually inspect for the following:
    • Pinched, kinked, restricted, or leaking pipes, hoses or fittings.
    • Restricted pump inlet duct/hose/filter.
    • Pinched, kinked, restricted, or leaking vacuum lines.
    • Heat damage.

    Did you find and correct the condition? If yes, go to step  42. If no, go to next step.

  4. Turn ON the ignition. Use a scan tool in order to command the AIR pump and solenoid ON and OFF. Does the pump turn ON and OFF with each command? If yes, go to next step. If no, go to step  11.
  5. Use a scan tool in order to command the AIR solenoid ON and OFF. Does the solenoid turn ON and OFF with each command? If yes, go to next step. If no, go to step  14.
  6. Disconnect the pipe/hose from the inlets of the shut-off valves. Use a scan tool in order to command the AIR pump and solenoid ON. Is airflow present at both hoses? If yes, go to next step. If no, go to step  16.
  7. Disconnect the vacuum supply line from the solenoid. Connect a vacuum gauge to the vacuum line. Start the engine and idle. Does the vacuum measure above 10 in. Hg? If yes, go to next step. If no, go to step  33.
    8. NOTE: Perform this step at each valve.
  8. Reconnect the vacuum line to the solenoid. Disconnect the vacuum line from the shut-off valve. Connect a vacuum gauge to the vacuum line. Start the engine and idle. Use a scan tool in order to command the AIR solenoid ON. Does the vacuum measure above 10 in Hg at both lines when the solenoid is commanded ON? If yes, go to next step. If no, go to step  26.
    9. NOTE: Perform this step at each valve.
  9. Remove the shut-off valve from the vehicle. Install a hand held vacuum pump to the valve. Apply 10 in. Hg to the valve. Does the valve hold vacuum for 1 minute? If yes, go to next step. If no, go to step  37.
    10. NOTE: Perform this step at each valve.
  10. Leave vacuum applied to the valve. Attempt to blow through the valve from the inlet side. Can you blow freely through the valve? If yes, go to step  27. If no, go to step  37.
  11. Disconnect the pump relay. Turn ON the ignition. Probe the feed circuits with a test lamp that is connected to a good ground. Does the test lamp illuminate when probing both circuits? If yes, go to next step. If no, go to step  22.
  12. Probe the control circuit of the relay with a test lamp that is connected to battery voltage. Use a scan tool in order to command the AIR pump and solenoid ON and OFF. Does the test lamp turn ON and OFF with each command? If yes, go to next step. If no, go to step  17.
  13. Install a 30-amp jumper wire between the relay switch feed and the pump feed. Turn ON the ignition. Does the pump operate? If yes, go to step  28. If no, go to step  20.
  14. Disconnect the solenoid. Turn ON the ignition. Probe the solenoid feed with a test lamp that is connected to a good ground. Does the test lamp illuminate? If yes, go to next step. If no, go to step  23.
  15. Probe the solenoid control circuit with a test lamp that is connected to battery voltage. Use a scan tool in order to command the AIR solenoid ON and OFF. Does the test lamp turn ON and OFF with each command? If yes, go to step  29. If no, go to step  17.
  16. Disconnect the outlet pipe/hose from the pump. Use a scan tool in order to command the AIR pump and solenoid ON. Is airflow present at the pump outlet? If yes, go to step  36. If no, go to step  40.
  17. Does the test lamp remain illuminated with each command? If yes, go to step  24. If no, go to step  25.
  18. Ensure that the ignition is ON. Disconnect the relay. Does the pump stop operating? If yes, go to next step. If no, go to step  32.
  19. Probe the relay control circuit with a test lamp that is connected to battery voltage. Use a scan tool in order to command the AIR pump and solenoid ON and OFF. Does the test lamp turn ON and OFF with each command? If yes, go to step  38. If no, go to step  24.
  20. Ensure the ignition is ON. Leave the jumper wire installed. Disconnect the AIR pump. Connect a test lamp between the feed and ground circuits. Does the test lamp illuminate? If yes, go to step  30. If no, go to next step.
  21. Ensure the ignition is ON. Leave the jumper wire installed. Connect a test lamp between the feed and a good ground. Does the test lamp illuminate? If yes, go to step  35. If no, go to step  34.
  22. Test the applicable feed circuit for the following conditions:
    • Open between the fuse and the relay.
    • Short to ground between the fuse and the pump.

    Did you find and correct the condition? If yes, go to step  42. If no, go to step  40.

  23. Test the solenoid feed circuit for an open or short to ground. Did you find and correct the condition? If yes, go to step  42. If no, go to step  39.
  24. Test the control circuit for a short to ground. Did you find and correct the condition? If yes, go to step  42. If no, go to step  41.
    25. NOTE: If diagnosis reveals a short to voltage in the AIR pump relay control circuit, check the AIR pumps. See DIAGNOSTIC AIDS .
  25. Test the control circuit for an open or short to voltage. Did you find and correct the condition? If yes, go to step  42. If no, go to step  31.
  26. Inspect the vacuum line for a leak or for a restriction. Did you find and correct the condition? If yes, go to step  42. If no, go to step  39.
  27. Inspect for a leaking or restricted AIR pipe/hose between the shut-off valve and the exhaust. Did you find and correct the condition? If yes, go to step  42. If no, repair restriction in exhaust.
  28. Test for poor connections at the relay. Did you find and correct the condition? If yes, go to step  42. If no, go to step  38.
  29. Test for poor connections at the solenoid. Did you find and correct the condition? If yes, go to step  42. If no, go to step  39.
  30. Test for poor connections at the pump. Did you find and correct the condition? If yes, go to step  42. If no, go to step  40.
  31. Test for poor connections at the control module. Did you find and correct the condition? If yes, go to step  42. If no, go to step  41.
  32. Repair the short to voltage in the pump feed circuit. After repairs, go to step  42.
  33. Repair the vacuum source. After repairs, go to step  42.
  34. Repair the open feed circuit. After repairs, go to step  42.
  35. Repair the open ground circuit. After repairs, go to step  42.
  36. Repair the AIR pipe/hose for a leak or a restriction between the pump and the shut-off valve. After repairs, go to step  42.
  37. Replace the shut-off valve. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  42.
  38. Replace the relay. After repairs, go to step  42.
  39. Replace the solenoid. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  42.
  40. Replace the AIR pump. Reconnect all devices and replace all fuses. Turn ON the ignition, with the engine OFF. Does the replacement AIR pump run continuously? If yes, go to step  18. If no, go to step  42.
  41. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  42. Start the engine. Allow the engine to reach normal operating temperature in Closed Loop. Use a scan tool in order to command the AIR pump and solenoid ON, while observing the pre-catalyst HO2S voltage parameters. Does the scan tool indicate pre-catalyst HO2S voltages are below 50 mV for the duration of system operation? If yes, go to next step. If no, go to step  3.
  43. 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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