Toyota DTC P0135 User's Manual
Contents
1. ECM c Turn the ignition switch ON CHECK Measure voltage between terminals HT1A HT1B of ECM con nectors and body ground HINT BE6653 Connect terminal HT1A to bank 1 sensor 1 Connect terminal HT1B to bank 1 sensor 2 g A Voltage 9 14 V Check and replace ECM See page IN 30 e Check resistance of heated oxygen sensor heater See page SF 70 Replace heated oxygen sensor Check and repair harness or connector between EFI main relay Marking EFI heated oxygen sensor and ECM See page IN 30 2000CELICA RM744U2. DI 56 DIAGNOSTICS ENGINE DI1ED 07 DTC Heated Oxygen Sensor Heater Circuit Malfunction Bank1 Sensor1 DTC Heated Oxygen Sensor Heated Circuit Malfunction Bank1 Sensor2 CIRCUIT DESCRIPTION Refer to DTC P0125 Insufficient Coolant Temp for Closed Loop Fuel Control on page DI 44 DTC No DTC Detecting Condition Trouble Area When the heater operates heater current exceeds 2 A P0135 2 trip detection logic e Open or short in heater circuit of heated oxygen sensor P0141 e Heated oxygen sensor heater Heater current of 0 2 A or less when the heater a ECM 2 trip detection a HINT e Bank 1 refers to the bank that includes cylinder No 1 e Sensor 1 refers to the sensor closer to the engine body e Sensor 2 refers to the sensor farther away from the engine body WIRING DIAGRAM Refer to DTC P0125 on page DI 44 for the WIRING DIAGRAM INSPECTION PROCEDURE HINT Read freeze frame data using TOYOTA hand held tester or OBD II scan tool Because freeze frame records the engine conditions when the malfunction is detected when troubleshooting it is useful for determining whether the vehicle was running or stopped the engine warmed up or not the air fuel ratio lean or rich etc at the time of the malfunction 2000 CELICA RM744U DI 57 DIAGNOSTICS ENGINE ia Check voltage between terminals HT1 HT2 of ECM connectors and body ground PREPARATION a Remove the ECM cover b Remove the 3 bolts from
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