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Home >> Mazda >> 2002 >> MPV LX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0101: Mass Airflow Sensor Inconsistent With Throttle Position Sensor >> Diagnostic Procedures
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Diagnostic Procedures

  1. Record freeze frame data. Check for service bulletins and on-line information. Repair as necessary. After repair, go to next step.
  2. Verify Current Input Signal Status - Is Concern Intermittent Or Constant -  Start engine. Using scan tool, access ECT,TP and MAF PIDs. Warm up engine until ECT PID is more than 176°F (80°C). Drive vehicle. Read MAF PID while TP PID is more than 50 percent. If MAF PID reading is less than 8.93 gram/sec., ensure TP sensor resistance changes smoothly with gradual opening of throttle valve. If TP sensor resistance does not change smoothly, replace TP sensor. After repair, go to step  6. If TP sensor operates as specified, go to step  4. If MAF PID is not as specified, go to next step.
  3. Verify Current Input Signal Status - Is Concern Intermittent Or Constant -  Start engine. Access ECT, MAF and RPM PIDs. Warm up engine until ECT PID is more than 158°F (70°C). Drive vehicle. Read MAF PID while RPM PID is less than 2000 RPM. If MAF PID reading is more than 103 gram/sec., go to step  7. If MAF PID reading is not more than 103 gram/sec., problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  4. Inspect Poor Connection Of MAF/IAT Sensor Connector -  Turn ignition off. Disconnect MAF/IAT sensor 6-pin harness connector. Check for damaged, loose or corroded terminals. If problem is not present, go to next step. If problem is present, repair as necessary. After repair, go to step  6.
  5. Inspect Poor Connection Of PCM Connector -  Disconnect PCM 104-pin harness connector. Check for damaged, loose or corroded terminals. If problem is present, repair as necessary. After repair, go to next step. If problem is not present, replace MAF/IAT sensor. After repair, go to next step.
  6. Verify Trouble Shooting Of DTC P0101 Completed -  Reconnect all connectors. Turn ignition on, engine off. Clear DTC from memory. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition on, engine off. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Access ECT, TP and MAF PIDs. Warm up engine until ECT PID is more than 176°F (80°C). Drive vehicle. Read MAF and TP PIDs. Ensure MAF PID is more than 8.93 gram/sec. and TP PID is more than 50 percent. If DTC P0101 is present, replace PCM. After repair, go to step  10. If DTC P0101 is not present, go to step  10.
  7. Check MAF/IAT Sensor Terminals For Electrical Corrosion -  Turn ignition off. Disconnect MAF/IAT sensor 6-pin harness connector. Check for damaged, loose or corroded terminals. If problem is not present, go to next step. If problem is present, repair or replace terminal or MAF/IAT sensor. After repair, go to step  9.
  8. Inspect Poor Connection Of PCM Connector -  Disconnect PCM 104-pin harness connector. Check for damaged, loose or corroded terminals. If problem is present, repair as necessary. After repair, go to next step. If problem is not present, go to next step.
  9. Verify Trouble Shooting Of DTC P0101 Completed -  Reconnect all connectors. Turn ignition on. Using scan tool, clear DTC from memory. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Warm up engine until ECT PID is more than 158°F (70°C). Read MAF and RPM PIDs. Ensure MAF PID is more than 103 gram/sec. and RPM PID is less than 2000 RPM. If DTC P0101 is present, replace PCM. After repair, go to next step. If DTC P0101 is not present, go to next step.
  10. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, go to applicable test and repair.
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