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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-109 . CIRCUIT OPERATION • Power is supplied from the MFI relay (terminal No. 2) to the left bank heated oxygen sensor • The ECM (terminal No. 35) controls continuity to the left bank heated oxygen sensor (rear) heater . 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 Left bank heated oxygen sensor heater (rear) current or voltage 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 . AK700399AB MFI relay A-33X Connector: A-33X AK700405AB Left bank heated Front B-13 (GR) Connector: B-13 AK700401AB ECM B-10 (GR) Connector: B-10 AK900602 Connector: A-13 A-13 AB |