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EC-214 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0137, P0157 HO2S2 2. CLEAR MIXTURE RATIO SELF-LEARNING VALUE 1. Clear the mixture ratio self-learning value. Refer to EC-22, "MIXTURE RATIO SELF-LEARNING VALUE CLEAR : Special Repair Requirement" . 2. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 or P0174 detected? Is it difficult to start engine? YES >> Perform trouble diagnosis for DTC P0171 or P0174. Refer to NO >> GO TO 3. 3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check the continuity between heated oxygen sensor 2 (HO2S2) harness connector and ECM harness 5. Also check harness for short to ground and short to power. Is the inspection result normal? YES >> GO TO 4. NO >> Repair open circuit, short to ground or short to power in harness or connectors. 4. 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 3. Also check harness for short to power. Is the inspection result normal? YES >> GO TO 5. NO >> Repair open circuit, short to ground or short to power in harness or connectors. 5. CHECK HEATED OXYGEN SENSOR 2 EC-215, "Component Inspection" Is the inspection result normal? DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0137 1 F95 1 F8 35 Existed P0157 2 F96 1 DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0137 1 F95 4 F8 33 Existed P0157 2 F96 4 34 DTC HO2S2 Ground Continuity Bank Connector Terminal P0137 1 F95 4 Ground Not existed P0157 2 F96 4 DTC ECM Ground Continuity Connector Terminal P0137 F8 33 Ground Not existed P0157 34 |