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P0138 HO2S2 EC-637 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] C D E F G H I J K L M A EC N P O 1. Disconnect ECM harness connector. 2. Check the continuity between HO2S2 harness connector and ECM harness connector. 3. Also check harness for short to power. Is the inspection result normal? YES >> GO TO 4. NO >> Repair or replace error-detected parts. 4. 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 3. Also check harness for short to power. Is the inspection result normal? YES >> GO TO 5. NO >> Repair or replace error-detected parts. 5. CHECK HEATED OXYGEN SENSOR 2 Check the heated oxygen sensor 2. Refer to EC-639, "Component Inspection" Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-44, "Intermittent Incident" . NO >> GO TO 6. 6. 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 >> INSPECTION END + − Continuity HO2S2 ECM Connector Terminal Connector Terminal F31 1 F85 23 Existed + − Continuity HO2S2 ECM Connector Terminal Connector Terminal F31 2 F85 22 Existed + − Continuity HO2S2 Connector Terminal F31 2 Ground Not existed + − Continuity ECM Connector Terminal F85 22 Ground Not existed |