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EC-216 < COMPONENT DIAGNOSIS > [QR25DE] P0144 HO2S3 - Drive vehicle at a speed of 80 km/h (50 MPH) or more for at least 3 consecutive minutes. CAUTION: Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws. NOTE: • Keep the vehicle speed as steady as possible during the cruising. • Never raise engine speed above 3,600 rpm in this step. - Release accelerator pedal fully and stop vehicle. NOTE: Never turn ignition switch OFF. 7. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000004211454 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-18, "MIXTURE RATIO SELF-LEARNING VALUE CLEAR : Special Repair Requirement" . 2. Activate “INSPECTION MODE 1”( ) to start engine, and let engine idle for at least 10 minutes. Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine? 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. HO2S3 ECM Continuity Connector Terminal Connector Terminal F102 1 F13 35 Existed |