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Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0101: MAF System Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. If DTC P0102, P0103, P0107, P0108, P0121, P0122, P0123 or P1635 is also set, diagnose these DTCs first. If these DTCs are not set, go to next step.
  3. Turn ignition off. Remove MAP sensor from intake manifold, leaving harness connected. Connect a hand-held vacuum pump to MAP sensor. Turn ignition on, with engine off. Observe MAP sensor display on scan tool while slowly applying 20 in. Hg of vacuum to MAP sensor. Each one in. Hg of vacuum should result in a smooth 3-4 kPa decrease in MAP sensor value. If MAP sensor value changes as specified, go to next step. If MAP sensor value does not change as specified, go to step  19.
  4. Apply 20 in. Hg of vacuum to MAP sensor. If MAP sensor reading on scan tool is 34 kPa or less, go to next step. If MAP sensor value is not 34 kPa or less, go to step  19.
  5. Disconnect vacuum source from MAP sensor. If MAP sensor reading returns to original value, go to next step. If MAP sensor does not return to original value, go to step  19.
  6. Turn ignition on, with engine off. Review FREEZE FRAME and/or FAILURE RECORDS data for this DTC and observe parameters. Clear DTCs. Turn ignition off for 15 seconds. Start engine and operate under conditions required to duplicate DTC, and as close to conditions recorded in FREEZE FRAME/FAILURE RECORDS as possible. See CIRCUIT DESCRIPTION . Using scan tool, check for DTCs. If this DTC resets, go to next step. If this DTC does not reset, see DIAGNOSTIC AIDS .
  7. Check for restricted MAF sensor inlet. Check for intake manifold and throttle body vacuum leaks. Check PCV system operation. Check for leaks at EGR flange and pipes. Repair as necessary. After repairs, go to step  21. If no problems are found, go to next step.
  8. Turn ignition off. Disconnect MAF sensor connector. Turn ignition on, with engine off. Using DVOM, measure voltage between battery ground and signal circuit at MAF sensor harness connector. If voltage reading is about 5 volts, go to next step. If voltage reading is not about 5 volts, go to step  10.
  9. Connect a test light between ignition feed circuit and ground circuit at MAF sensor harness connector. If test light illuminates, go to step  13. If test light does not illuminate, go to step  12.
  10. If voltage is less than 4.5 volts, go to step  14. If voltage is not less than 4.5 volts, go to next step.
  11. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on, with engine off. Using DVOM, measure voltage between ground and signal circuit at MAF sensor harness connector. If voltage is about zero volts, go to step  20. If voltage is not about zero volts, go to step  17.
  12. Using a test light connected to battery ground, probe ignition feed circuit at MAF sensor harness connector. If test light illuminates, go to step  15. If test light does not illuminate, go to step  16.
  13. Check for poor connections and terminal tension at MAF sensor. Repair as necessary. After repairs, go to step  21. If no problems are found, go to step  18.
  14. Check MAF sensor signal circuit for an open, short to ground, or short to MAF sensor ground circuit. Repair as necessary. After repairs, go to step  21. If no problems are found, go to step  20.
  15. Locate and repair open in MAF sensor ground circuit. After repairs, go to step  21.
  16. Locate and repair open in MAF sensor ignition feed circuit. After repairs, go to step  21.
  17. Locate and repair short to voltage in MAF sensor signal circuit. After repairs, go to step  21.
  18. Replace MAF sensor. After repairs, go to step  21.
  19. Replace MAP sensor. After repairs, go to step  21.
  20. Replace PCM. Perform PCM reprogramming procedures. After repairs, go to step  21.
  21. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Start engine and operate under conditions required to duplicate DTC. See CIRCUIT DESCRIPTION . Using scan tool, check for DTCs. If this DTC resets, go to step  2. If this DTC does not reset, go to next step.
  22. Using scan tool, review CAPTURED INFO. If any DTCs are present that have not been diagnosed, go to appropriate DTC test. If no DTCs are present, system is okay.
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