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Home >> Mazda >> 2000 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1136: Front O2 Sensor Heater Circuit High >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Go to next step.
  2. Inspect front O2 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  6.
  3. Check resistance of front O2 sensor between terminals "C" and "D". If resistance is 15.7 ohms, go to next step. If resistance is not 15.7 ohms, replace O2 sensor and go to step  6.
  4. 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  6.
  5. Disconnect front oxygen sensor. Turn ignition on. Check voltage at O2 sensor harness connector terminal "D" (Violet/Yellow wire). If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Violet/Yellow wire between PCM and O2 sensor. Go to next step.
  6. Connect all connectors. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Start engine. Allow to warm to operating temperature. If DTC is not pending, go to next step. If DTC is pending, replace PCM. After repair, go to next step.
  7. 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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