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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-85 . CIRCUIT OPERATION • Power is supplied from the MFI relay (terminal No. 2) to the heated oxygen sensor (front) heater. • The ECM (terminal No. 34) controls continuity to the heated oxygen sensor (front) heater by turn- . TECHNICAL DESCRIPTION • The ECM checks whether the heater current is within a specified range when the heater is ener- • The ECM checks whether the heater voltage is within a specified range when the heater is not . DESCRIPTIONS OF MONITOR METHODS Heated oxygen sensor heater (front) current or volt- age is out of specified range. . MONITOR EXECUTION Continuous . MONITOR EXECUTION CONDITIONS Other Monitor (There is no temporary DTC stored in memory for the item monitored below) • Not applicable Sensor (The sensor below is determined to be normal) • Not applicable . AK704229AB Connector: A-13 A-13 AK704226 Connector: A-34X MFI relay A-34X AB AK704227 Connector: B-09 ECM B-09 (GR) AB AK704228 AB Heated oxygen Connector: C-34 C-34 (B) SRS-ECU |