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Home >> Mitsubishi >> 1995 >> Eclipse RS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.0L Turbo >> Diagnostic Tests >> Code P0135: Front Ho2S Heater Circuit Fault

Code P0135: Front Ho2S Heater Circuit Fault

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  in this article. For appropriate WIRING DIAGRAMS, see WIRING DIAGRAMS  section.
  1. Disconnect front oxygen sensor connector. Connect test harness (MD998464) to oxygen sensor. Check continuity between terminal No. 1 (Red clip) and No. 3 (Blue clip). If continuity exists, go to next step. If continuity does not exist, replace oxygen sensor.
  2. Start and warm engine until coolant temperature is 176°F (80°C) or more. Connect jumper wires between battery positive and oxygen sensor terminal No. 1 (Red clip) and between battery negative and terminal No. 3 (Blue clip). Connect DVOM between oxygen sensor terminal No. 2 (Black clip) and No. 4 (White clip). Measure oxygen sensor output voltage, while repeatedly racing engine. If voltage is .6-1.0 volt, go to next step. If voltage is not .6-1.0 volt, replace oxygen sensor.
  3. Disconnect oxygen sensor connector. Turn ignition on. Measure voltage between sensor connector terminal No. 1 (Red wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, check PCM connector and wiring harness between oxygen sensor connector and PCM.
  4. Disconnect PCM connector. Turn ignition on. Measure voltage between PCM connector terminal No. 60 (Yellow wire) and ground. If battery voltage does not exist, check PCM connector and wiring harness between oxygen sensor connector and PCM. If battery voltage exists, Check PCM connector. If PCM connector is okay, replace PCM.
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