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EC-186 < DTC/CIRCUIT DIAGNOSIS > [MR18DE] P0131 A/F SENSOR 1 4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector. 4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector 5. Also check harness for short to power. Is the inspection result normal? YES >> GO TO 5. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 5. CHECK INTERMITTENT INCIDENT Perform GI-40, "Intermittent Incident" . Is the inspection result normal? YES >> GO TO 6. NO >> Repair or replace. 6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1 Replace air fuel ratio (A/F) sensor 1. Refer to CAUTION: • Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one. • Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial >> INSPECTION END A/F sensor 1 ECM Continuity Connector Terminal Connector Terminal F50 1 F8 49 Existed 2 53 A/F sensor 1 Ground Continuity Connector Terminal F50 1 Ground Not existed 2 ECM Ground Continuity Connector Terminal F8 49 Ground Not existed 53 |