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Home › Chevrolet › 2000 › Venture Plus › Repair and Diagnosis › Engine Performance › System › Engine Controls Self-Diagnostics › Diagnostic Tests › DTC P0102: Mass Airflow Sensor Circuit - Low Frequency › Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Start engine and allow it to idle. Using scan tool, observe MAF FREQUENCY. If MAF frequency is less than 1200 Hz, go to step  4. If MAF frequency is not less than 1200 Hz, go to next step.
  3. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Operate vehicle as close to conditions recorded in FREEZE FRAME as possible. Select SPECIFIC DTC function, and then enter this DTC. If scan tool indicates that this DTC failed this ignition, go to next step. If scan tool does not indicate that this DTC failed this ignition, see DIAGNOSTIC AIDS .
  4. Check for blockage at MAF sensor inlet screen. Check for vacuum leaks around throttle body spacer, intake manifold, PCV system, EGR system, oil dipstick tube and oil filler cap. Check operation of PCV system. 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 harness connector. Turn ignition on, with engine off. Using DVOM, check voltage between battery ground and signal circuit terminal 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  9.
  6. Connect a test light between ignition feed circuit and ground circuit terminals at MAF sensor harness connector. If test light illuminates, go to step  8. If test light does not illuminate, go to next step.
  7. Connect a test light between ground and ignition feed circuit terminal at MAF sensor harness connector. If test light illuminates, go to step  10. If test light does not illuminate, go to step  11.
  8. Check for poor connection at MAF sensor connector. Repair as necessary. After repairs, go to step  15. If connection is okay, go to step  12.
  9. Check MAF sensor signal circuit for open for short to ground, or short to voltage. Repair as necessary. After repairs, go to step  15. If circuit is okay, go to step  14.
  10. Repair open in MAF sensor ground circuit. After repairs, go to step  15.
  11. Repair open in MAF sensor ignition feed circuit. After repairs, go to step  15.
  12. Replace MAF sensor. After replacing sensor, go to step  15.
  13. Repair poor connections at PCM. After repairs, go to next step.
  14. Replace PCM. Perform PCM reprogramming procedures. After repairs, go to next step.
  15. Using scan tool, clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for DTC P0102. If scan tool indicates that this DTC failed this ignition, go to step  2. If scan tool does not indicate that this DTC failed this ignition, system is okay.
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