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EC-194 < COMPONENT DIAGNOSIS > [VQ25DE, VQ35DE] 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 terminals under the following conditions. Is the inspection result normal? YES >> INSPECTION END NO >> Go to Diagnosis Procedure INFOID:0000000003856590 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-18, "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 DTC ECM Condition Voltage Connec- tor + – Terminal Terminal P0139 F8 33 [HO2S2 (bank 1) signal] 35 (Sensor Keeping engine at idle for 10 minutes A change of voltage should be more P0159 34 [HO2S2 (bank 2) signal] 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] |