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EC-230 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0139, P0159 HO2S2 Is the inspection result normal? YES >> INSPECTION END NO >> Go to Diagnosis Procedure INFOID:0000000009719968 1. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection E38. Refer to Ground Inspection in . Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ground connection. 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, 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 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. DTC ECM Condition Voltage Connec- tor + – Terminal Terminal P0139 F8 33 [HO2S2 (bank 1) signal] 35 (Sensor Coasting from 80 km/h (50 MPH) in A change of voltage should be more P0159 34 [HO2S2 (bank 2) signal] DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0139 1 F95 1 F8 35 Existed P0159 2 F96 1 |