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Home >> Buick >> 1996 >> Roadmaster Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0410 - Air System >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, activate AIR pump. If pump turns on, go to step 6). If AIR pump does not turn on, go to next step.
  3. Turn ignition off. Disconnect AIR pump relay. Turn ignition on, engine off. Using test light connected to ground, probe power supply circuit to relay. If test light illuminates, go to next step. If test light does not illuminate, go to step 14).
  4. Turn ignition off. Reconnect AIR pump relay. Disconnect electrical connector from AIR pump. Connect test light to battery negative terminal and probe AIR pump harness connector terminal "A". Turn ignition on, with engine off. Using scan tool, enable AIR pump. If test light illuminates, go to step 31). If test light does not illuminate, go to step 23).
  5. Connect test light between AIR pump harness connector terminals "A" and "C". Using scan tool, enable AIR pump. If test light illuminates, go to step 31). If test light does not illuminate, go to step 23).
  6. Turn ignition off. Disconnect AIR pump harness connector. Using test light connected to negative battery terminal, probe AIR pump harness connector terminal "B". Turn ignition on, with engine off. Using scan tool, enable AIR pump. If test light illuminates, go to next step. If test light does not illuminate, go to step 31).
  7. Turn ignition off. Reconnect AIR pump harness connector. Disconnect AIR pump outlet hose. Turn ignition on. Using scan tool, enable AIR pump. If air is present at pump outlet, go to next step. If air is not present, go to step 31).
  8. Check for restriction or blockage in AIR hoses/pipes between AIR pump and to where the system branches to both sides of engine. Repair as necessary. After repairs, go to step 35). If AIR hoses/pipes are not restricted or blocked, go to next step.
  9. Remove vacuum bleed valve line from "T" fitting in AIR pump outlet hose. Connect a hand-held vacuum pump to this line and apply about 5 in. Hg. If vacuum holds, go to next step. If vacuum does not hold, go to step 13).
  10. Using scan tool, enable AIR pump. If vacuum bleeds off, see DIAGNOSTIC AIDS. If vacuum does not bleed off, go to next step.
  11. Turn ignition off. Disconnect vacuum bleed valve electrical connector. Connect test light between bleed valve harness terminals. Turn ignition on, with engine off. Using scan tool, command AIR pump on and off. If test light illuminates, go to step 33). If test light does not illuminate, go to next step.
  12. With test light connected to ground, probe power feed circuit in vacuum bleed valve harness connector. Using scan tool, command AIR pump on and off. If test light illuminates, go to step 26). If test light does not illuminate, go to step 25).
  13. Check vacuum hose to valve for cranks, splits or other damage. Repair as necessary. After repairs, go to step 35. If vacuum hose is okay, go to step 33).
  14. Repair battery supply circuit to relay. After repairs, go to step 35).
  15. Check fuse to battery feed circuit to relay. If fuse is faulty, go to step 28). If fuse is okay, go to next step.
  16. Using test light, check power to fuse. If test light illuminates, go to step 27). If test light does not illuminate, go to step 28).
  17. Connect test light to battery voltage and probe relay battery feed circuit in relay connector. If test light illuminates, go to step 29). If test light does not illuminate, go to next step.
  18. Replace fuse. Disconnect AIR pump and vacuum bleed solenoid harness connectors. Connect test light to battery voltage and probe power feed circuit in vacuum bleed solenoid harness connector. If test light illuminates, go to step 30). If test light does not illuminate, go to next step.
  19. Using a test light connected to ground, probe power feed circuit in vacuum bleed solenoid harness connector. Using scan tool, enable AIR pump. If test light illuminates, go to next step. If test light does not illuminate, go to step 32.
  20. Reconnect AIR pump harness connector. Using scan tool, enable AIR pump. Check fuse. If fuse blew again, go to step 34). If fuse is okay, go to next step.
  21. Reconnect vacuum bleed solenoid harness connector. Using scan tool, enable AIR pump. Check fuse. If fuse blew, go to step 33).
  22. Repair open in circuit between AIR pump and relay. After repairs, go to step 35).
  23. Repair faulty ground connection or open AIR pump ground circuit. After repairs, go to step 35).
  24. Repair open in circuit from terminal "B" of AIR pump to splice. After repairs, go to step 35).
  25. Repair open in vacuum bleed solenoid power circuit between solenoid harness connector and splice. After repairs, go to step 35).
  26. Repair open in vacuum bleed solenoid ground circuit. After repairs, go to step 35).
  27. Repair open in circuit between fuse and relay. After repairs, go to step 35).
  28. Repair power feed circuit to fuse. After repairs, go to step 35).
  29. Repair short to ground between fuse and relay. After repairs, go to step 35).
  30. Repair short to ground between relay and AIR pump/vacuum bleed solenoid. After repairs, go to step 35).
  31. Check AIR electrical connections. Repairs as necessary. After repairs, go to step 35). If connections are okay, go to step 35).
  32. Replace AIR pump relay. After repairs, go to step 35).
  33. Replace vacuum bleed solenoid. After repairs, go to step 35).
  34. Replace AIR pump. After repairs, go to next step.
  35. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0410. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool did not indicate that this test ran and passed, repeat step 2).
  36. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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