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EC-188 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0131, P0151 A/F SENSOR 1 • IPDM E/R harness connector F12 >> Repair or replace harness or connectors. 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, short to ground or short to power in harness or connectors. 5. CHECK INTERMITTENT INCIDENT Perform GI-39, "Intermittent Incident" . Is the inspection result normal? YES >> GO TO 6. NO >> Repair or replace malfunctioning part. 6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1 Replace malfunctioning air fuel ratio (A/F) sensor 1. CAUTION: • Discard any A/F 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 A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant DTC A/F sensor 1 ECM Continuity Bank Connector Terminal Connector Terminal P0131 1 F27 1 F8 45 Existed 2 49 P0151 2 F64 1 53 2 57 DTC A/F sensor 1 Ground Continuity Bank Connector Terminal P0131 1 F27 1 Ground Not existed 2 P0151 2 F64 1 2 DTC ECM Ground Continuity Connector Terminal P0131 F8 45 Ground Not existed 49 P0151 53 57 |