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P0138, P0158 HO2S2 EC-225 < DTC/CIRCUIT DIAGNOSIS > [VQ35HR] C D E F G H I J K L M A EC N P O 2. Check the continuity between HO2S2 harness connector or ECM harness connector and ground. 3. Also check harness for short to power. Is the inspection result normal? YES >> GO TO 6. NO >> Repair open circuit, short to ground or short to power in harness or connectors. 6. CHECK HEATED OXYGEN SENSOR 2 EC-226, "Component Inspection" Is the inspection result normal? YES >> GO TO 8. NO >> GO TO 7. 7. REPLACE HEATED OXYGEN SENSOR 2 Replace malfunctioning heated oxygen sensor 2. CAUTION: • Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one. • Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant >> INSPECTION END 8. CHECK INTERMITTENT INCIDENT GI-36, "Intermittent Incident" . >> INSPECTION END 9. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection M95. Refer to Ground Inspection in Is the inspection result normal? YES >> GO TO 10. NO >> Repair or replace ground connection. 10. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 1. Clear the mixture ratio self-learning value. Refer to EC-28, "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 P0172 or P0175 detected? Is it difficult to start engine? YES >> Perform trouble diagnosis for DTC P0172, P0175. Refer to NO >> GO TO 11. 11. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect HO2S2 harness connector. 3. Disconnect ECM harness connector. 4. Check the continuity between HO2S2 harness connector and ECM harness connector. DTC HO2S2 ECM Ground Continuity Bank Connector Terminal Connector Terminal P0138 1 F54 4 F102 76 Ground Not existed P0158 2 F53 4 80 |