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P0141 HO2S2 HEATER EC-787 < COMPONENT DIAGNOSIS > [MR20DE (WITH EURO-OBD)] C D E F G H I J K L M A EC N P O 1. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection E21. Refer to Ground Inspection in . Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ground connection. 2. CHECK HO2S2 POWER SUPPLY CIRCUIT 1. Disconnect heated oxygen sensor 2 harness connector. 2. Turn ignition switch ON. 3. Check the voltage between HO2S2 harness connector and ground. Is the inspection result normal? YES >> GO TO 4. NO >> GO TO 3. 3. DETECT MALFUNCTIONING PART Check the following. >> Repair open circuit or short to ground or short to power in harness or connectors. 4. CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check the continuity between HO2S2 harness connector and ECM harness connector. 4. Also check harness for short to ground and short to power. Is the inspection result normal? YES >> GO TO 5. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 5. CHECK HEATED OXYGEN SENSOR 2 HEATER EC-790, "Component Inspection" Is the inspection result normal? YES >> GO TO 7. NO >> GO TO 6. 6. REPLACE HEATED OXYGEN SENSOR 2 Replace heated oxygen sensor 2. CAUTION: • Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one. • Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool and approved anti-seize lubricant. >> INSPECTION END HO2S2 Ground Voltage Connector Terminal E58 2 Ground Battery voltage HO2S2 ECM Continuity Connector Terminal Connector Terminal E58 3 F7 5 Existed |