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EC-230 < DTC/CIRCUIT DIAGNOSIS > [HR16DE] P0138 HO2S2 >> INSPECTION END 8. CHECK INTERMITTENT INCIDENT GI-41, "Intermittent Incident" >> INSPECTION END 9. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection E15. Refer to Ground Inspection in GI-41, "Intermittent Incident" 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 . 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 E63 1 F11 59 Existed HO2S2 ECM Continuity Connector Terminal Connector Terminal E63 4 F11 50 Existed HO2S2 Ground Continuity Connector Terminal E63 4 Ground Not existed ECM Ground Continuity Connector Terminal F11 50 Ground Not existed |