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EC-222 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] P0139, P0159 HO2S2 Diagnosis Procedure INFOID:0000000006158652 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 . 2. Run engine for at least 10 minutes at idle speed. YES >> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to EC-231, "On Board Diagnosis Logic" NO >> GO TO 3. 3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 (HO2S2) 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. 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 ground. DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0139 1 F13 4 F54 78 Existed P0159 2 F12 4 DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0139 1 F13 1 F54 55 Existed P0159 2 F12 1 74 DTC HO2S2 Ground Continuity Bank Connector Terminal P0139 1 F13 1 Ground Not existed P0159 2 F12 1 DTC ECM Ground Continuity Bank Connector Terminal P0139 1 F54 55 Ground Not existed P0159 2 74 |