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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 P1122: TP Sensor Input Is Stuck Closed >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check for service bulletins. Go to next step.
  2. Using scan tool, retrieve pending and stored DTCs. See SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. If DTC P1103 is not present, go to next step. If DTC P1103 is present, go to appropriate test and repair first.
  3. Using scan tool, access PID/DATA MONITOR. Record PID data for ECT, TP and MAF. Start engine. Ensure ECT PID is 176°F (80°C) or more. Drive vehicle with MAF PID more than 8.36 lb/min. If TP PID is less than 12.5 percent, go to next step. If TP PID is 12.5 percent or more, problem is not current (intermittent).
  4. Turn ignition off. Disconnect TP sensor. Inspect TP sensor and harness connector terminals. If no problem is found, go to next step. If problem is found, repair as necessary and go to step  8.
  5. Check TP sensor resistance while gradually opening throttle. If resistance changes smoothly, go to next step. If resistance does not change smoothly, replace TP sensor. Go to step  8.
  6. Turn ignition off. Disconnect PCM connectors. Inspect PCM and harness connector terminals. If no problem is found, go to next step. If problem is found, repair as necessary and go to step  8.
  7. Connect PCM connectors. turn ignition on. Check voltage drop of Light Green/Red wire by measuring voltage between TP sensor harness connector terminal "A" and PCM harness connector No. 2 terminal "I". Check voltage drop of Green/Black wire by measuring voltage between TP sensor harness connector terminal "C" and PCM harness connector No. 3 terminal "E". If no voltage is present, go to next step. If voltage is present, repair as necessary. Go to next step.
  8. Connect all connectors. Start engine. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Ensure ECT PID is 176°F (80°C) or more. Drive vehicle for at least 5 seconds under the following conditions:
    • MAF PID is more than 8.36 lb/min.
    • TP PID is 12.5 percent or more.
    If same DTC is not pending, go to next step. If same DTC is pending, replace PCM. After repair, go to next step.
  9. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. If any DTC is present, go to appropriate test. If no DTC is present, test is complete.
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