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Home >> Mazda >> 2003 >> 6 s, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls [Self-Diagnostics 3.0L] >> Diagnostic Tests >> DTC P0101: Mass Airflow/Intake Air Temperature Sensor Inconsistent With Throttle Position Sensor >> Diagnostic Procedure

Diagnostic Procedure

  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Verify Current Input Signal Status - Is Concern Intermittent Or Constant -  Connect WDS or equivalent to DLC-2. Start engine. Access ECT, TP1 and MAF PIDs. Warm-up engine until ECT PID is 176°F (80°C) or more. Drive vehicle. Read MAF PID while TP1 PID is 50 percent or more. If MAF PID reading is 0.90 lbs./min. (6.8 grams/sec.) or less, make sure TP1 PID reading changes smoothly while gradually opening throttle valve. If TP1 PID reading changes as specified, go to next step. If TP1 PID reading does not change as specified, replace throttle body. Refer to AIR INDUCTION SYSTEMS in REMOVAL & INSTALLATION article. After repair, go to step  5. For other conditions, go to next step.
  4. Verify Current Input Signal Status - Is Concern Intermittent Or Constant -  Connect WDS or equivalent to DLC-2. Start engine. Access ECT, MAF and RPM PIDs. Warm-up engine until ECT PID reading is 158°F (70°C) or more. Read MAF PID while RPM PID is 2000 RPM or less. If MAF PID reading is 14.43 lbs./min. (109.3 grams/sec.) or more, go to step  6. If MAF PID reading is not 14.43 lbs./min. (109.3 grams/sec.) or more, problem is intermittent. Refer to INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  5. Verify Trouble Shooting Of DTC P0101 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Access ECT, TP1 and MAF PIDs. Warm-up engine until ECT PID is reading 176°F (80°C) or more. Drive vehicle and read TP1 and MAF PIDs. Verify PID readings are within specifications for 5 seconds or more.
    • MAF PID: 0.90 lbs./min. (6.8 grams/sec.) or more
    • TP1 PID: 50 percent or more
    If PENDING CODE of same DTC is not present, go to step  9. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to step  9.
  6. Inspect MAF/IAT Sensor Connector For Poor Connection -  Turn ignition off. Disconnect MAF/IAT sensor 5-pin harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If no malfunction is present, go to next step. If any malfunction is present, repair or replace terminals. After repair, go to step  8.
  7. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If any malfunction is present, repair or replace terminal. After repair, go to step. If no malfunction is present, replace MAF/IAT sensor. After repair, go to next step.
  8. Verify Trouble Shooting Of DTC P0101 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Warm-up engine until ECT PID is 158°F (70°C) or more. Read MAF and RPM PIDs. MAF PID should indicate 14.43 lbs./min. (109.3 grams/sec.) or less while RPM PID is 2000 RPM or less. If PENDING CODE for same DTC is not present, go to next step. If PENDING CODE for same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  9. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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