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HO2S1 EC-489 < DTC/CIRCUIT DIAGNOSIS > [HR12DE (TYPE 2)] C D E F G H I J K L M A EC N P O 2. Listen for an exhaust gas leak before three way catalyst (manifold). Is exhaust gas leak detected? YES >> Repair or replace. NO >> GO TO 4. 4. CHECK FOR INTAKE AIR LEAK Listen for an intake air leak after the manifold absolute pressure (MAP) sensor. Is intake air leak detected? YES >> Repair or replace. NO >> GO TO 5. 5. CHECK HO2S1 GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 1 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between HO2S1 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 6. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 6. CHECK HEATED OXYGEN SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Check the continuity between HO2S1 harness connector and ECM harness connector. 2. Check the continuity between HO2S1 harness connector or ECM harness connector and ground. 3. Also check harness for short to power. Is the inspection result normal? YES >> GO TO 7. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 7. CHECK MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR Check manifold absolute pressure (MAP) sensor. EC-402, "Component Inspection" SEC502D HO2S1 ECM Continuity Connector Terminal Connector Terminal F46 1 F8 56 existed HO2S1 ECM Continuity Connector Terminal Connector Terminal F46 4 F8 49 Existed HO2S1 ECM Ground Continuity Connector Terminal Connector Terminal F46 4 F8 49 Ground Not existed |