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MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS MULTIPOINT FUEL INJECTION (MPI) 13A-24 DIAGNOSTIC TROUBLE CODE PROCEDURES DTC P0031: Heated Oxygen Sensor Heater Circuit low (bank 1, sensor 1). . CIRCUIT OPERATION • Power is supplied from the MPI relay (terminal No. 4) to the right bank heated oxygen sensor • The ENGINE-ECU (terminal No. 47) controls continuity to the right bank heated oxygen sensor . TECHNICAL DESCRIPTION • The ENGINE-ECU checks whether the heater current is within a specified range when the • The ENGINE-ECU checks whether the heater current is within a specified range when the . 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 AK303014 CONNECTOR: B-17X MFI RELAY MFI RELAY FRONT OF VEHICLE B-17X AB 16DB400A COVER ENGINE CONTROL UNIT AIR CLEANER AK303047 B-09 (B) CONNECTOR: B-09 THROTTLE BODY RIGHT BANK HEATED OXYGEN SENSOR (FRONT) AB |