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P0138, P0158 HO2S2 EC-829 < DTC/CIRCUIT DIAGNOSIS > [VK50VE] C D E F G H I J K L M A EC N P O Is the inspection result normal? YES >> INSPECTION END NO >> Go to Diagnosis Procedure INFOID:0000000005237312 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 M95. Refer to Ground Inspection in Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace ground connection. 3. CHECK HEATED OXYGEN SENSOR 2 CONNECTOR 1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector. 2. Check that water is not inside connectors. Is the inspection result normal? 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. Is the inspection result normal? 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. DTC ECM Condition Voltage Connector + – Terminal Terminal P0138 F110 32 31 Coasting from 80 km/h (50 MPH) with se- The voltage should be below 0.18 V at P0158 36 DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0138 1 F87 1 F110 31 Existed P0158 2 F88 1 DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0138 1 F87 4 F110 32 Existed P0158 2 F88 4 36 |