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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-292 . CIRCUIT OPERATION • Power is supplied from the MFI relay (terminal No. 4) to the right bank heated oxygen sensor (rear) heater. • The PCM (terminal No. 138) controls continuity to the right bank heated oxygen sensor (rear) heater by turning the power transistor in the PCM "ON" and "OFF". . TECHNICAL DESCRIPTION • The PCM checks whether the heater current is within a specified range when the heater is ener- gized. . DESCRIPTIONS OF MONITOR METHODS Right bank heated oxygen sensor heater (rear) current is out of specified range when engine coolant tem- perature is over 20 °C (68°F). . 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) • Engine coolant temperature sensor . 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 AK303063 THROTTLE BODY RIGHT BANK CONNECTOR: B-08 B-08 (GR) AB AK303059 CONNECTOR: B-23 PCM AB AIR CLEANER B-23 |