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Home >> Mazda >> 2001 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1102: Mass Airflow (MAF) Sensor Inconsistent With Throttle Position Sensor, Less Than Expected >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
  2. Start engine. Using scan tool, access PID/DATA MONITOR. Record PID data for ECT, MAF and TP. Ensure ECT PID data is 176°F (80°C) or more. Drive vehicle for at least 5 seconds with TP PID at 50 percent or more. If MAF PID is less than .70 lbs/Min, check TP sensor. Replace as necessary. If TP sensor is okay, go to next step. If MAF PID is more than .70 lbs/Min, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
  3. Disconnect MAF sensor connector. Check connector for loose or damaged terminals, poor contact or corrosion. Repair or replace as necessary and go to step  5. If no problem is found, go to next step.
  4. Disconnect appropriate PCM connector. Check connector for loose or damaged terminals, poor contact or corrosion. Repair as necessary and go to next step. If no problem is found, replace MAF sensor and go to next step.
  5. Reconnect all connectors. Turn ignition on. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Drive vehicle for at least 5 seconds with TP PID at 50 percent or more and MAF PID at .70 lbs/Min or more. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P1102 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1102 is not present, go to next step.
  6. Cycle ignition from off to on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.
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