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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-237 . CIRCUIT OPERATION • Power is supplied from the MFI relay (terminal No. 4) to the right bank heated oxygen sensor • The PCM (terminal No. 126) controls continuity to the right bank heated oxygen sensor (front) . TECHNICAL DESCRIPTION • The PCM checks whether the heater current is within a specified range when the heater is ener- . DESCRIPTIONS OF MONITOR METHODS rent is out of specified range when engine coolant °C (68°F). . MONITOR EXECUTION . 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 AK303059 CONNECTOR: B-23 PCM AB AIR CLEANER B-23 AK303047 B-09 (B) CONNECTOR: B-09 THROTTLE BODY RIGHT BANK AB |