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P0139 HO2S2 EC-289 < DTC/CIRCUIT DIAGNOSIS > [MR FOR NISMO RS MODELS] C D E F G H I J K L M A EC N P O 5. Also check harness for short to power. YES >> GO TO 3. NO >> Repair or replace error-detected parts. 3. CHECK HO2S2 INPUT SIGNAL CIRCUIT 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. 3. Also check harness for short to power. YES >> GO TO 4. NO >> Repair or replace error-detected parts. 4. CHECK HEATED OXYGEN SENSOR 2 Check the heated oxygen sensor 2. Refer to EC-290, "Component Inspection" Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-45, "Intermittent Incident" . NO >> GO TO 5. 5. REPLACE HEATED OXYGEN SENSOR 2 Replace heated oxygen sensor 2. Refer to . CAUTION: • Discard any 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 sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial service tool). >> INSPECTION END + − Continuity HO2S2 ECM Connector Terminal Connector Terminal F69 1 F25 33 Existed + − Continuity HO2S2 ECM Connector Terminal Connector Terminal F69 4 F25 29 Existed + − Continuity HO2S2 Connector Terminal F69 4 Ground Not existed + − Continuity ECM Connector Terminal F25 29 Ground Not existed |