LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2000 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1141: Rear O2 Sensor Heater Circuit Low >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Go to next step.
  2. Disconnect rear oxygen sensor. Inspect rear 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  8.
  3. Check resistance of rear 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  8.
  4. Turn ignition on. Check voltage at O2 sensor harness connector terminal "C" (Black/White wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open or short in circuit between ignition switch and O2 sensor. Go to step  8.
  5. Turn ignition off. Disconnect PCM. 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.
  6. Check continuity between rear O2 sensor harness connector terminal "D" (Red/Yellow wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground. Go to step  8.
  7. Check continuity of Red/Yellow wire between rear O2 sensor harness connector terminal "D" and PCM connector No. 3 terminal "V". If no problem is found, go to next step. If problem is found, repair as necessary and go to next step.
  8. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Start engine. Warm engine to operating temperature. If DTC is not pending, go to next step. If 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 DTC is not present, test is complete.
scientia non olet · About LEMON Manuals