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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 78 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 3.8L)DIAGNOSTIC TESTSDTC P0410: SECONDARY AIR INJECTION SYSTEMDIAGNOSTIC PROCEDURES
1999 GMC Forward Control 5.7 R, Automatic

Diagnostic Procedures

1999 GMC Forward Control 5.7 R, AutomaticSECTION Diagnostic Procedures
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 Pontiac Grand Prix, 2002 Pontiac Bonneville, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, and 2002 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If DTC P0412 or DTC P0418 are also set, refer to that diagnostic first. See DTC P0412: SECONDARY AIR INJECTION SOLENOID CONTROL CIRCUIT  or DTC P0418: SECONDARY AIR INJECTION RELAY CONTROL CIRCUIT  .
  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Check for damage, loose or restricted AIR pipes or hoses, and loose or restricted vacuum lines. Did you find and correct the condition? If yes, go to step  42. If no, go to next step.
  3. Turn ignition on. Using scan tool, command AIR pump relay on and off. Does the AIR pump turn on and off with each command? If yes, go to next step. If no, go to step  10.
  4. Using scan tool, command AIR solenoid on and off. Does the AIR solenoid turn on and off with each command? If yes, go to next step. If no, go to step  14.
  5. Disconnect AIR hose from shutoff valve (pump side). Using scan tool, command AIR pump on. Is airflow present at hose outlet? If yes, go to next step. If no, go to step  16.
  6. Disconnect vacuum line (source) from solenoid. Start engine. Is vacuum present at vacuum line? If yes, go to next step. If no, go to step  24.
  7. Reconnect vacuum line to solenoid. Disconnect vacuum line from shutoff valve. Start engine. Using scan tool, command AIR solenoid on. Is vacuum present at vacuum line? If yes, go to next step. If no, go to step  17.
  8. Remove shutoff valve from vehicle. Install a hand held vacuum pump to valve. Apply 10 in. Hg vacuum to valve. Does the valve hold vacuum for 1 minute? If yes, go to next step. If no, go to step  33.
    9. NOTE: Attempt to blow through valve without vacuum applied. If you can blow through valve, go to step  33.
  9. Leave vacuum applied to valve. Attempt to blow through valve from inlet side. Can you blow through valve? If yes, go to step  25. If no, go to step  33.
  10. Does pump run continuously? If yes, go to step  18. If no, go to next step.
  11. Remove the AIR pump relay. Turn on the ignition, with the engine off. Probe the relay battery positive and the ignition 1 voltage circuits with a test lamp 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  20.
  12. Probe the AIR pump relay control circuit with a test lamp that is connected to battery voltage. Command the AIR pump relay on and off with a scan tool. Does the test lamp turn on and off with each command? If yes, go to next step. If no, go to step  23.
  13. Connect a 30-amp fused jumper wire between the battery positive circuit switched side of the AIR relay and the AIR pump supply voltage circuit of the AIR relay. Turn on the ignition, with the engine off. Does the AIR pump turn on? If yes, go to step  34. If no, go to step  26.
  14. Disconnect the AIR vacuum solenoid. Turn on the ignition, with the engine off. Probe the ignition 1 voltage circuit of the AIR solenoid 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  20.
  15. Probe the AIR solenoid control circuit with a test lamp that is connected to battery voltage. Command the AIR solenoid on and off with a scan tool. Does the test lamp turn on and off with each command? If yes, go to step  36. If no, go to step  23.
  16. Remove the AIR hose from the pump. Command the AIR Pump on with a scan tool. Is airflow pressure present at the pump outlet? If yes, go to step  25. If no, go to step  39.
  17. Inspect the vacuum line from the solenoid to the valve for a restriction or a loose condition. Did you find and correct the condition? If yes, go to step  42. If no, go to step  37.
  18. Ensure the ignition is on, with the engine off. Remove the relay. Does the AIR pump turn off? If yes, go to next step. If no, go to step  28.
  19. Probe the AIR pump relay control circuit with a test lamp that is connected to battery voltage. Command the AIR pump on and off with a scan tool. Does the test lamp turn on and off with each command? If yes, go to step  35. If no, go to step  29.
  20. Test the AIR fuse and the ignition 1 fuses. Are the fuse or fuses okay? If yes, go to step  30. If no, go to next step.
  21. Test the voltage circuit corresponding to the open fuse or fuses for a short to ground. Did you find and correct the condition? If yes, go to step  42. If no, go to next step.
  22. Test the AIR pump supply voltage circuit for a short to ground. Did you find and correct the condition? If yes, go to step  42. If no, go to step  39.
  23. Is the test lamp on steady? If yes, go to step  29. If no, go to step  32.
  24. Repair vacuum source. After repairs go to step  42.
  25. Repair pipe, hose or check valve for open or restriction. After repairs go to step  42.
  26. Ensure the ignition is on, with the engine off. Ensure that the jumper wire is still installed. Disconnect the pump. Connect a test lamp 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  38. If no, go to next step.
  27. Ensure the ignition is on, with the engine off. Ensure the jumper wire is still installed. Disconnect the pump. Probe the AIR pump supply voltage circuit with a test lamp connected to a good ground. Does the test lamp illuminate? If yes, go to step  31. If no, go to step  30.
  28. Repair short to voltage in Red wire between pump and pump relay. After repairs, go to step  42.
  29. 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  42. If no, go to step  41.
  30. Repair the open in the AIR pump supply voltage circuit. After repairs, go to step  42.
  31. Repair the open or high resistance in the AIR pump ground circuit. After repairs, go to step  42.
    32. NOTE: If diagnosis reveals a short to voltage in AIR pump relay control circuit, check AIR pump for damage.
  32. Test for an open or short to voltage in the control circuit. Did you find and correct the condition? If yes, go to step  42. If no, go to step  40.
  33. Replace shut-off valve. After repairs, go to step  42.
  34. Check pump relay connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  42. If problem was not found, go to next step.
  35. Replace pump relay. After repairs, go to step  42.
  36. Check solenoid connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  42. If problem was not found, go to next step.
  37. Replace AIR solenoid. After repairs, go to step  42.
  38. Test for poor connections at the pump. Did you find and correct the condition? If yes, go to step  42. If no, go to next step.
    39. NOTE: After replacing pump, turn ignition on, engine off. If pump runs without scan tool command, go to step  18.
  39. Replace AIR pump. After repairs, go to step  42.
  40. Test for poor connections at PCM. Did you find and correct the condition? If yes, go to step  42. If no, go to next step.
  41. Replace PCM. Program replacement PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  42. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within Conditions for Running DTC. Does DTC run and pass? If yes, go to next step. If no, go to step  2.
  43. Using scan tool, observe stored information. Does scan tool displays any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
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