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P0137 HO2S2 EC-225 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A EC N P O Always drive vehicle at a safe speed. Is the inspection result normal? YES-1 >> To check malfunction symptom before repair: Refer to GI-44, "Intermittent Incident" YES-2 >> Confirmation after repair: INSPECTION END >> Proceed to . Diagnosis Procedure INFOID:0000000010775147 1. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 1. Start engine and warm it up to the normal operating temperature. 2. Clear the mixture ratio self-learning value. Refer to . 3. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 detected? Is it difficult to start engine? YES >> Perform trouble diagnosis for DTC P0171. Refer to NO >> GO TO 2. 2. CHECK HEATED OXYGEN SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect heated oxygen sensor 2 (HO2S2) harness connector. 4. Check the continuity between HO2S2 harness connector and ECM harness connector. 5. Also check harness for short to ground and short to power. Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace malfunctioning part. 3. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Check the continuity between HO2S2 harness connector and ECM harness connector. 2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ECM Condition Voltage Connector + – Terminal F8 57 59 Coasting from 80 km/h (50 MPH) with selector The voltage should be above 0.77 V at + − Continuity HO2S2 ECM Connector Terminal Connector Terminal CVT models F44 1 F8 59 Existed M/T models F125 + − Continuity HO2S2 ECM Connector Terminal Connector Terminal CVT models F44 2 F8 57 Existed M/T models F125 |