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Home >> Chevrolet >> 2000 >> Venture Plus >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0103: Mass Airflow Sensor Circuit - High 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, monitor MAF frequency. If MAF frequency is less than 11,500 Hz, go to step  4. If MAF frequency is not less than 11,500 Hz, 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 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. Turn ignition off. Disconnect MAF sensor harness connector. Start engine. Using scan tool, monitor MAF frequency. If MAF frequency is zero Hz, go to next step. If MAF frequency is not zero Hz, go to step  7.
  5. Check for poor connection at MAF sensor connector. Repair as necessary. After repairs, go to step  10. If connector is okay, go to next step.
  6. Replace MAF sensor. After replacing sensor, go to step  10.
  7. Check for incorrect routing of MAF sensor wiring harness. Ensure harness is not near ignition coils or other high-voltage components. Reroute wiring harness as necessary. After repairs, go to step  10. If wiring harness is routed correctly, go to next step.
  8. Check MAF signal circuit terminal connections at PCM. Repair as necessary. After repairs, go to step  10. If terminal connections are okay, go to next step.
  9. Replace PCM. Program replacement PCM using required equipment. After repairs, go to next step.
  10. 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 this DTC. 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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