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P0138 HO2S2 EC-749 < COMPONENT DIAGNOSIS > [QR25DE EXCEPT FOR CALIFORNIA] C D E F G H I J K L M A EC N P O • 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 tool [commercial service tool: (J-43897-18) or J43897-12] and approved anti-seize lubricant (commercial service tool). >> INSPECTION END 8. CHECK INTERMITTENT INCIDENT GI-42, "Intermittent Incident" . >> INSPECTION END 9. 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 10. NO >> Repair or replace ground connection. 10. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 1. Clear the mixture ratio self-learning value. Refer to EC-568, "MIXTURE RATIO SELF-LEARNING VALUE CLEAR : Special Repair Requirement" . 2. Run engine for at least 10 minutes at idle speed. YES >> Perform trouble diagnosis for DTC P0172. Refer to . NO >> GO TO 11. 11. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check the continuity between HO2S2 harness connector and ECM harness connector. 5. Also check harness for short to ground and short to power. YES >> GO TO 12. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 12. 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 or ECM harness connector and ground. 3. Also check harness for short to power. HO2S2 ECM Continuity Connector Terminal Connector Terminal F42 1 F13 35 Existed HO2S2 ECM Continuity Connector Terminal Connector Terminal F42 4 F13 33 Existed HO2S2 ECM Ground Continuity Connector Terminal Connector Terminal F42 4 F13 33 Ground Not existed |