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E C - 2 1 8 < COMPONENT DIAGNOSIS > [VQ35HR] P0139, P0159 HO2S2 Is the inspection result normal? YES >> INSPECTION END NO >> GO TO 3. 3. PERFORM COMPONENT FUNCTION CHECK-III Check the voltage between ECM harness connector and ground under the following condition. Is the inspection result normal? YES >> INSPECTION END NO >> Go to Diagnosis Procedure INFOID:0000000000956609 1. 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 2. NO >> Repair or replace ground connection. 2. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 1. Clear the mixture ratio self-learning value. Refer to EC-21, "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, P0172, P0174 or P0175 detected? Is it difficult to start engine? YES >> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to or 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 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 4. NO >> Repair open circuit or short to ground or short to power in harness or connectors. DTC ECM Ground Condition Voltage Connector Terminal P0139 F102 76 Ground Keeping engine at idle for 10 minutes A change of voltage should be more than P0159 80 DTC ECM Ground Condition Voltage Connector Terminal P0139 F102 76 Ground Coasting from 80 km/h (50 MPH) in D po- A change of voltage should be more than P0159 80 DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0139 1 F54 1 F102 84 Existed P0159 2 F53 1 |