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P0131, P0151 A/F SENSOR 1 EC-671 < DTC/CIRCUIT DIAGNOSIS > [VQ40DE FOR USA AND CANADA] C D E F G H I J K L M A EC N P O 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 harness continuity between A/F sensor 1 terminal and ECM terminal as follows. Refer to Wiring Diagram. 4. Check harness continuity between the following terminals and ground. Refer to Wiring Diagram. 5. Also check harness for short to power. OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 5. CHECK INTERMITTENT INCIDENT Perform GI-42, "Intermittent Incident" . OK or NG OK >> GO TO 6. NG >> Repair or replace. 6. REPLACE A/F SENSOR 1 Replace malfunctioning A/F sensor 1. Refer to . 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 Heated Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant. >> INSPECTION END A/F sensor 1 terminal ECM terminal Bank1 1 69 2 73 Bank 2 1 77 2 81 Continuity should exist. Bank 1 Bank 2 A/F sensor 1 terminal ECM terminal A/F sensor 1 terminal ECM terminal 1 69 1 77 2 73 2 81 Continuity should not exist. |