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MPI <4G9> – Troubleshooting 13C-26 Code No. P0135 Oxygen sensor heater (front) system Probable cause Range of Check D The engine coolant temperature is approx. 20 _ C or more. D The oxygen sensor heater (front) remains on. D The engine speed is 50 r/min or more. D Battery voltage is 11 – 16 V. Set Conditions D The current, which flows through the oxygen sensor heater (front), is 0.2 A D Malfunction of oxygen sensor heater (front) D Open or short circuit in the oxygen sensor heater D Malfunction of engine-ECU NG Replace the engine-ECU. OK Check the trouble symptoms. OK Transient malfunction OK Check the harness wires between NG Repair OK Check the following connector NG Repair OK Check the harness wire between Repair NG Check the following connectors: NG OK Measure at engine-ECU connector D Measure the voltage at the D Ignition switch: ON D Voltage between terminal 60 and OK Check the harness wires between Repair NG Check the following connectors: NG OK Measure at oxygen sensor (front) D Disconnect the connector and D Ignition switch: ON D Voltage between terminal 1 and OK Check the following connector: NG Repair Measure at oxygen sensor (front) D Disconnect the connector and D Resistance between terminals 1 Ω NG Replace |