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Home >> Mazda >> 2000 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1102: Mass Air Flow Input Low >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Inspect all applicable harness connectors. If problem is found, repair as needed.
  2. Start engine. Using scan tool, access PID/DATA MONITOR. Record PID data for ECT, MAF and TP. Start engine. Ensure ECT PID 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 lb/min, check TP sensor. replace as necessary. If TP sensor is okay, go to next step. If MAF PID is more than .70 lb/min, problem is not current (intermittent).
  3. Disconnect MAF sensor. Check connector and sensor for damage or corrosion. If no problem is found, go to next step. If any problem is found, repair connector terminals or replace MAF sensor and go to step  5.
  4. Disconnect PCM. Check connector and PCM for damage or corrosion. If no problem is found, go to next step. If any problem is found, repair as necessary. Go to next step.
  5. Connect all connectors. Turn ignition on. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Start engine. Drive vehicle for at least 5 seconds under the following conditions:
    • MAF PID is more than .70 lb/min.
    • TP PID is 50 percent or more.
    If same DTC is not present, go to next step. If same DTC is present, replace PCM. After repair, go to next step.
  6. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. If no DTC is present, testing is complete. If any DTC is present, go to applicable test.
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