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Home >> Chevrolet >> 1996 >> Monte Carlo LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.1L Engine >> Diagnostic Trouble Codes >> DTC P0102 - MAF Sensor Circuit Low Frequency >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Start engine and allow it to idle. Using scan tool, select ENG 1 data list. Monitor MAF FREQUENCY display. If frequency is less than 1200 Hz, go to step 4). If frequency is 1200 Hz or more, go to next step.
  3. 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. Select SPECIFIC DTC function then enter DTC P0102. If scan tool indicates FAILED THIS IGN, go to next step. If scan tool does not indicate FAILED THIS IGN, see DIAGNOSTIC AIDS.
  4. Check air leaks at MAF sensor, throttle body spacer, intake manifold, PCV, system EGR system, oil dipstick tube and oil filler cap. Repair as necessary. After repairs are completed, go to step 14). If air leak is not 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 ground and signal circuit terminal at MAF sensor harness connector. If voltage 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. Observe test light. If test light is on, go to step 8). If test light is off, go to next step.
  7. Connect a test light between ground and ignition feed circuit terminal at MAF sensor harness connector. If test light is on, go to step 10). If test light is off, go to step 11).
  8. Check for poor connection at MAF sensor connector. Repair as necessary. After repair is completed, go to step 14). If connector is okay, go to step 12).
  9. Check MAF sensor signal circuit between PCM and MAF sensor for an open, short to voltage or short to ground. Repair as necessary. After repair is completed, go to step 14). If circuit is okay, go to step 13).
  10. Locate and repair open in MAF sensor ground circuit. After repair is completed, go to step 14).
  11. Locate and repair open in MAF ignition feed circuit. After repair is completed, go to step 14).
  12. Replace MAF sensor. After repair is completed, go to step 14).
  13. Replace and program replacement PCM. After repair is completed, go to next step.
  14. Using scan tool, select CLEAR INFO or CLEAR DTCS function to 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 FAILED THIS IGN, repeat step 2). If scan tool does not indicate FAILED THIS IGN, repair is complete.
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