DTC P0135 - Front Ho2S Heater Circuit Malfunction
NOTE:
For component terminal identification, see TERMINAL IDENTIFICATION
in this article. For wiring diagrams, see WIRING DIAGRAMS - 2.0L TURBO
article.
- Disconnect front HO2S connector. Connect Test Harness (MD998464 ) to front HO2S. Check continuity between test harness terminals No. 1 (Red clip) and No. 3 (Blue clip). If continuity exists, go to next step. If continuity does not exist, replace front HO2S.
- Start and warm engine until coolant temperature is 176°F (80°C) or more. Connect jumper wires between battery positive and test harness terminal No. 1 (Red clip) and between battery negative and terminal No. 3 (Blue clip). Connect DVOM between test harness terminals No. 2 (Black clip) and No. 4 (White clip). Go to next step.
- Check front HO2S output voltage, while repeatedly racing engine. If voltage is 0.6-1.0 volt, go to next step. If voltage is not as specified, replace front HO2S.
- Disconnect front HO2S connector. Turn ignition on. Check voltage between test harness connector terminal No. 1 (Red clip). If battery voltage exists, go to next step. If battery voltage does not exist, check PCM connector and wiring harness between front HO2S connector and PCM.
- Disconnect PCM connector. Turn ignition on. Check voltage between ground and PCM connector terminal No. 60 (Yellow wire). If battery voltage does not exist, check PCM connector and wiring harness between front HO2S connector and PCM. If battery voltage exists, check PCM connector. If PCM connector is okay, replace PCM.