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P0145 HO2S3 EC-245 < COMPONENT DIAGNOSIS > [QR25DE FOR CALIFORNIA] C D E F G H I J K L M A EC N P O Never turn ignition switch OFF. 3. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000004349287 1. 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 2. NO >> Repair or replace ground connection. 2. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 1. Clear the mixture ratio self-learning value. Refer to EC-32, "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 P0171 or P0172. Refer to . NO >> GO TO 3. 3. CHECK HO2S3 GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 3 harness connector. 3. Disconnect ECM harness connector. 4. Check the continuity between HO2S3 harness connector and ECM harness connector. 5. Also check harness for short to ground and short to power. YES >> GO TO 5. NO >> GO TO 4. 4. DETECT MALFUNCTIONING PART Check the following. • Harness connectors F58, F101 • Harness for open or short between heated oxygen sensor 3 and ECM >> Repair open circuit or short to ground or short to power in harness or connectors. 5. CHECK HO2S3 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Check the continuity between HO2S3 harness connector and ECM harness connector. 2. Check the continuity between HO2S3 harness connector or ECM harness connector and ground. HO2S3 ECM Continuity Connector Terminal Connector Terminal F102 1 F13 35 Existed HO2S3 ECM Continuity Connector Terminal Connector Terminal F102 4 F13 34 Existed |