LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 258 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0410: Secondary Air Injection >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. Turn ignition on, with engine off. Does the Secondary Air Injection (AIR) pump run constantly? If yes, go to next step. If no, go to step  4 .
  3. Turn ignition off. Remove the AIR pump relay. Turn ignition on, with engine off. Does the AIR pump run continuously? If yes, go to step  32 . If no, go to step  5 .
  4. Command the AIR pump ON and OFF with a scan tool. Does the AIR pump turn ON and OFF? If yes, go to step  15 . If no, go to step  6 .
  5. Turn ignition off. Probe the AIR pump relay control circuit at the fuse block with a test light connected to battery positive. Does the test light illuminate? If yes, go to step  35 . If no, go to step  56 .
  6. Turn ignition off. Remove the AIR pump relay. Turn ignition on, with engine off. Probe the AIR pump relay battery positive voltage circuit at the fuse block with a test light connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  29 .
  7. Probe the ignition 1 voltage circuit of the AIR pump relay with a test light connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  11 .
  8. Probe the control circuit of the AIR pump relay at the AIR fuse block with a test light connected to battery voltage. Command the AIR pump relay ON and OFF with a scan tool. Does the test light turn ON and OFF when commanded with a scan tool? If yes, go to next step. If no, go to step  26 .
  9. Connect a fused jumper wire between the battery positive voltage circuit of the air pump relay and the air pump supply voltage circuit of the air pump relay. Does the air pump turn on? If yes, go to step  41 . If no, go to next step.
  10. Turn ignition off. Disconnect the AIR pump connector. Probe the AIR pump supply voltage circuit with a test light connected to a good ground. Does the test light illuminate? If yes, go to step  12 . If no, go to step  49 .
  11. Is IGN E fuse open? If yes, go to step  36 . If no, go to step  53 .
  12. Remove fused jumper wire from the relay block. Connect a jumper wire between each of the terminals in the AIR pump harness connector and the corresponding terminal at the AIR pump. Connect the Connector Test Adapters (J-36169-A) at the AIR fuse block. Measure the voltage from the AIR pump supply circuit of the AIR pump (Black lead) to the AIR pump supply circuit of the AIR pump relay (Red lead) with a DVOM. Is the voltage more than 0.5 volt? If yes, go to step  49 . If no, go to next step.
  13. Remove Connector Test Adapters (J-36169-A). Remove jumper wire from the ground side of the AIR pump harness connector. Probe the AIR pump ground circuit with a test light connected to battery voltage. Does the test light illuminate? If yes, go to next step. If no, go to step  50 .
  14. Connect the jumper wire between the ground terminal of the AIR pump harness connector and the corresponding terminal at the AIR pump. Ensure that the AIR pump supply voltage jumper wire is still connected. Connect the Connector Test Adapters (J-36169-A) at the AIR fuse block. Measure the voltage from the AIR pump ground circuit of the AIR pump (Red lead) to a good ground (Black lead) with a DVOM. Is the voltage more than 0.5 volt? If yes, go to step  50 . If no, go to step  43 .
  15. Start and operate engine at idle until closed-loop operation is achieved. Increase the engine speed to 1500 RPM. Monitor the O2S voltage parameter with a scan tool. Command the AIR pump relay ON with a scan tool. Does the O2S voltage parameter drop to less than 50 mV within 10 seconds? If yes, see DIAGNOSTIC AIDS  . If no, go to next step.
  16. Turn ignition off. Disconnect the AIR shut-off valve vacuum hose. Connect a vacuum pump to the shut-off valve and apply 10 in. Hg (33 kPa) of vacuum to the valve. Does the shut-off valve hold vacuum for one minute? If yes, go to next step. If no, go to step  57 .
  17. Disconnect the vacuum pump from the AIR shut-off valve. Connect a vacuum gauge to the AIR shut-off valve hose. Start and operate engine at idle. Command the AIR pump relay ON with the scan tool. Does the vacuum increase to more than 14 in. Hg (47 kPa)? If yes, go to step  20 . If no, go to next step.
  18. Turn ignition off. Disconnect the AIR solenoid connector. Probe the AIR solenoid ground circuit with a test light connected to battery positive. Does the test light illuminate? If yes, go to next step. If no, go to step  50 .
  19. Turn ignition on, with engine off. Probe the AIR solenoid voltage supply circuit with a test light connected to a good ground. Command the AIR pump relay ON with a scan tool. Does the test light turn ON when commanded with a scan tool? If yes, go to step  22 . If no, go to step  28 .
  20. Connect the vacuum hose to the AIR shut-off valve. Disconnect the AIR pump crossover hose at the exhaust check valve. Start and operate engine at idle. Command the AIR pump relay ON with a scan tool. Is air pressure present at the AIR crossover hose? If yes, go to step  47 . If no, go to next step.
  21. Turn engine off. Connect the AIR pump crossover hose at the exhaust check valve. Disconnect the AIR pump crossover hose at the AIR shut-off valve. Start and operate engine at idle. Command the AIR pump relay ON with a scan tool. Is air pressure present at the outlet of the AIR shut-off valve? If yes, go to step  54 . If no, go to step  25 .
  22. Connect the AIR solenoid connector. Disconnect the vacuum hose to the shut-off valve at the AIR solenoid. Install a vacuum gauge at the AIR vacuum control solenoid port. Start and operate engine at engine. Command the AIR pump relay ON with a scan tool. Does the vacuum increase to 14 in. Hg (47 kPa)? If yes, go to step  45 . If no, go to next step.
  23. Disconnect the AIR solenoid supply vacuum line from the inlet of the AIR solenoid. Connect a vacuum gauge at the vacuum hose. Start and operate engine at engine. Is the vacuum more than 14 in. Hg (47 kPa)? If yes, go to step  42 . If no, go to next step.
    24. NOTE: Inspect vacuum check valve for proper installation. The tapered side of check valve goes towards the vacuum source.
  24. Remove check valve. Install a vacuum gauge in the engine side of the vacuum hose. Start and operate engine at idle. Is the vacuum more than 14 in. Hg (47 kPa)? If yes, go to step  40 . If no, go to step  48 .
  25. Disconnect the AIR pump outlet hose at the AIR shut-off valve. Start and operate engine at idle. Command the AIR pump relay ON with a scan tool. Is air pressure present at the outlet hose? If yes, go to step  57 . If no, go to step  27 .
    26. NOTE: A short to voltage on this circuit will cause the AIR pump to run constantly with the key in the OFF position. After repairs, ensure to retest the AIR pump operation.
  26. Test the AIR pump relay control circuit for an open or short to voltage. Did you find and correct the condition? If yes, go to step  61 . If no, go to step  44 .
  27. Disconnect the AIR pump outlet hose at the AIR pump. Command the AIR pump relay ON with a scan tool. Is air pressure present at the AIR pump outlet? If yes, go to step  37 . If no, go to step  38 .
  28. Test the AIR solenoid supply voltage circuit for an open, a high resistance or a short to ground. Replace the AIR solenoid fuse as necessary. Did you find and correct the condition? If yes, go to step  62 . If no, go to step  46 .
  29. Probe both sides of the AIR fuse with a test light connected to a good ground. Does the test light illuminate on both sides of the fuse? If yes, go to step  52 . If no, go to next step.
  30. Does the test light illuminate at one side of the fuse? If yes, go to next step. If no, go to step  51 .
  31. Test the battery positive voltage circuit between the AIR and the relay for a short to ground. Replace the AIR fuse as necessary. Did you find and correct the condition? If yes, go to step  62 . If no, go to step  33 .
  32. Test the AIR pump supply voltage circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  61 . If no, go to step  34 .
  33. Test the AIR pump supply voltage circuit for a short to ground. Did you find and correct the condition? If yes, go to step  62 . If no, go to next step.
  34. Install the AIR pump relay. Disconnect the AIR pump harness connector. Replace the AIR fuse as necessary. Turn ignition on, with engine off. Connect a test light between the supply voltage circuit and the ground circuit of the AIR pump harness connector. Command the AIR pump relay ON and OFF with a scan tool. Does the test light turn ON and OFF when commanded ON and OFF with a scan tool? If yes, go to step  58 . If no, go to step  56 .
  35. Test for a short to ground in the AIR pump relay control circuit. Did you find and correct the condition? If yes, go to step  61 . If no, go to step  60 .
  36. Test the ignition 1 voltage circuit for a short to ground between the IGN E fuse and the AIR pump relay. Replace the IGN E fuse as necessary. Did you find and correct the condition? If yes, go to step  62 . If no, go to step  39 .
  37. Inspect for a restriction or a leak in the AIR pump outlet hoses. Did you find and correct the condition? If yes, go to step  62 . If no, go to step  39 .
  38. Inspect for a restriction or a leak in the AIR pump inlet hoses. Did you find and correct the condition? If yes, go to step  62 . If no, go to step  58 .
  39. Replace the component that is shorted to ground. After repairs, go to step  62 .
  40. Inspect the vacuum line between the check valve and the AIR vacuum control solenoid for leaks, restrictions, looseness or splits. Did you find and correct the condition? If yes, go to step  62 . If no, go to step  55 .
  41. Test for an intermittent and for a poor connection at the AIR pump relay. Did you find and correct the condition? If yes, go to step  62 . If no, go to step  56 .
  42. Test for an intermittent and for a poor connection at the AIR solenoid. Did you find and correct the condition? If yes, go to step  62 . If no, go to step  59 .
  43. Test for an intermittent and for a poor connections at the AIR pump. Did you find and correct the condition? If yes, go to step  62 . If no, go to step  58 .
  44. Test for an intermittent and for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  62 . If no, go to step  60 .
  45. Repair vacuum hose between the AIR vacuum control solenoid and the AIR shut-off valve for a restriction, splits or a loose condition. After repairs, go to step  62 .
  46. Repair short to voltage in the AIR vacuum solenoid supply voltage circuit between the AIR solenoid fuse and the AIR solenoid. Replace the AIR solenoid fuse as necessary. After repairs, go to step  62 .
  47. Repair restriction or leak in the exhaust check valve, exhaust check valve outlet pipe or exhaust manifold. After repairs, go to step  62 .
  48. Repair restriction or leak in vacuum hose between the check valve and intake or the vacuum outlet port. After repairs, go to step  62 .
  49. Repair open or high resistance in the AIR pump supply voltage circuit. After repairs, go to step  62 .
    50. NOTE: This circuit provides a ground path for both the AIR solenoid and the AIR pump.
  50. Repair open or high resistance in the AIR pump ground circuit. After repairs, go to step  62 .
  51. Repair open or high resistance in the battery positive voltage circuit between the battery fuse and the AIR fuse. After repairs, go to step  62 .
  52. Repair open circuit in the battery positive circuit between the AIR fuse and the AIR pump relay. After repairs, go to step  62 .
  53. Repair open or high resistance in the ignition 1 voltage circuit. After repairs, go to step  62 .
  54. Replace AIR crossover hose. After repairs, go to step  62 .
  55. Replace vacuum check valve. After replacing check valve, go to step  62 .
  56. Replace AIR pump relay. After repairs, go to step  62 .
  57. Replace AIR shut-off valve. After repairs, go to step  62 .
  58. Replace AIR pump. After repairs, go to step  61 .
  59. Replace AIR solenoid valve. After repairs, go to step  62 .
  60. Replace PCM. See appropriate REMOVAL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  61. Ensure the AIR fuse and the solenoid fuse are installed and not open. Ensure all components are installed and secured. Ensure all connections are connected and secured. Turn ignition on, with engine off. Command the AIR pump relay ON and OFF. Does the AIR pump turn ON and OFF when commanded with a scan tool? If yes, go to next step. If no, go to step  2 .
  62. Clear DTCs with a scan tool. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC  . Does the DTC run and pass? If yes, go to next step. If no, go to step  2 .
  63. Using scan tool, observe the stored information and capture information. If scan tool displays any undiagnosed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTCs are displayed, system is okay.
scientia non olet · About LEMON Manuals