|
|
EC-226 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0138, P0158 HO2S2 YES >> GO TO 5. NO >> Repair open circuit, short to ground or short to power in harness or connectors. 5. CHECK HEATED OXYGEN SENSOR 2 Check heated oxygen sensor 2. Refer to EC-227, "Component Inspection" Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-42, "Intermittent Incident" . NO >> Replace malfunctioning heated oxygen sensor 2. Refer to . 6. CLEAR MIXTURE RATIO SELF-LEARNING VALUE 1. Clear the mixture ratio self-learning value. Refer to . 2. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0172 or P0175 detected? Is it difficult to start engine? YES >> Perform trouble diagnosis for DTC P0172, P0175. Refer to NO >> GO TO 7. 7. 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. Is the inspection result normal? YES >> GO TO 8. NO >> Repair open circuit, short to ground or short to power in harness or connectors. 8. 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 and ground, or ECM harness connector and 3. Also check harness for short to power. Is the inspection result normal? DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0138 1 F72 1 F8 59 Existed P0158 2 F73 1 DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0138 1 F72 4 F8 57 Existed P0158 2 F73 4 58 DTC HO2S2 Ground Continuity Bank Connector Terminal P0138 1 F72 4 Ground Not existed P0158 2 F73 4 DTC ECM Ground Continuity Connector Terminal P0138 F8 57 Ground Not existed P0158 58 |