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P0138, P0158 HO2S2 EC-1253 < COMPONENT DIAGNOSIS > [VQ35DE] C D E F G H I J K L M A EC N P O Diagnosis Procedure INFOID:0000000004362102 1. INSPECTION START Confirm the detected malfunction (A or B). Refer to Which malfunction is detected? A >> GO TO 2. B >> GO TO 9. 2. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection E9. Refer to Ground Inspection in . Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace ground connection. 3. CHECK HO2S2 CONNECTOR FOR WATER 1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector. 2. Check that water is not inside conductors. YES >> GO TO 4. NO >> Repair or replace harness or connectors. 4. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Disconnect ECM harness connector. 2. Check the continuity between HO2S2 harness connector and ECM harness connector. 3. Also check harness for short to ground and short to power. YES >> GO TO 5. NO >> Repair open circuit, short to ground or short to power in harness or connectors. 5. 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 P0138 1 F62 1 F13 35 Existed P0158 2 F56 1 DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0138 1 F62 4 F13 33 Existed P0158 2 F56 4 34 DTC HO2S2 Ground Continuity Bank Connector Terminal P0138 1 F62 4 Ground Not existed P0158 2 F56 4 |