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P0135 HO2S1 HEATER ECH-177 < DTC/CIRCUIT DIAGNOSIS > [HRA2DDT] C D E F G H I J K L M A ECH N P O P0135 HO2S1 HEATER DTC Logic INFOID:0000000010379070 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING Turn ignition switch OFF and wait at least 12 minutes. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Turn ignition switch ON and wait at least 3 seconds. 2. Check DTC. Is DTC detected? YES >> Go to ECH-177, "Diagnosis Procedure" . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000010379071 1. CHECK ECM HARNESS CONNECTOR CONNECTIONS Check ECM connector connection F17. Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ECM connector connection. 2. CHECK HEATED OXYGEN SENSOR 1 HARNESS CONNECTOR CONNECTION Check heated oxygen sensor 1 harness connector connection F48. Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace heated oxygen sensor 1 harness connector. 3. CHECK GROUND CONNECTION Check ground connection E4. Refer to Ground Inspection in Is the inspection result normal? YES >> GO TO 4. NO >> Repair or replace ground connection. 4. CHECK HO2S1 POWER SUPPLY CIRCUIT 1. Disconnect heated oxygen sensor 1 harness connector. 2. Turn ignition switch ON. 3. Check the voltage between HO2S1 sensor 1 harness connector and ground. DTC No. CONSULT screen terms (Trouble diagnosis con- tent) DTC detecting condition Possible cause P0135 O2 SENSOR 1 HEATER • ECM detects open circuit of Heated oxygen sen- sor 1 heater circuit for 2.5 second or more. • ECM detects short circuit to power of Heated ox- ygen sensor 1 heater circuit for 2.5 second or • ECM detects short circuit to ground of Heated ox- ygen sensor 1 heater circuit for 2.5 second or • Harness or connectors (The heated oxygen sensor 1 heater • Heated oxygen sensor 1 heater |