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Home >> Pontiac >> 2000 >> Firebird Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0102: MAF Sensor Circuit - Low Frequency >> Diagnostic Procedures

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. Start and operate engine at idle. Using scan tool, monitor MAF FREQUENCY. If frequency is less than 1200 Hz, go to step  4. If frequency is not less than 1200 Hz, go to next step.
  3. Turn ignition on, engine off. Using scan tool, read and record FAILURE RECORDS data. Clear DTCs. Operate vehicle within conditions noted in FAILURE RECORDS. Using scan tool, read SPECIFIC DTC. If scan tool indicates that this DTC FAILED THIS IGN, go to next step. If DTC FAILED THIS IGN is not displayed, see DIAGNOSTIC AIDS .
  4. Check for MAF sensor inlet screen blockage. Check for vacuum leaks at intake manifold, throttle body or EGR valve flange and pipes. Check for PCV valve faulty, missing or incorrectly installed. Repair as necessary. After repairs, go to step  14. If no problems are found, go to next step.
  5. Turn ignition off. Disconnect MAF sensor connector. Turn ignition on, with engine off. Using DVOM, measure voltage between MAF sensor harness connector signal circuit and chassis ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, go to step  9.
  6. Connect a test light between MAF sensor harness connector ignition feed and ground circuits. If test light illuminates, go to step  8. If test light does not illuminate, go to next step.
  7. Connect test light between MAF sensor harness connector ignition feed circuit and battery ground. If test light illuminates, go to step  10. If test light does not illuminate, go to step  11.
  8. Check for faulty connection at MAF sensor. Repair as necessary. After repairs, go to step  14. If connection is okay, go to step  12.
  9. Check MAF sensor signal circuit between PCM and MAF sensor for open or short. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  13.
  10. Locate and repair open in the MAF sensor ground circuit. After repairs, go to step  14.
  11. Locate and repair open MAF sensor ignition feed circuit. After repairs, go to step  14.
  12. Replace MAF sensor. After replacing sensor, go to step  14.
  13. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  14. Turn ignition on, with engine off. Using scan tool, read and record FAILURE RECORDS data, and then clear DTCs. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, select SPECIFIC DTC INFO for DTC P0102. If scan tool indicates that this DTC FAILED THIS IGN, go to step  2. If scan tool does not indicate that this DTC FAILED THIS IGN, system is okay.
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