Scrambler L4-150 2.5L VIN U 1-bbl (1983)
Powertrain Control Module: Description and Operation
General Operation
The MCU monitors the oxygen sensor voltage and, based upon the mode of operation, generates a control signal for the carburetor stepper motor.
When the system is in the closed loop mode, the air/fuel mixture will vary according to the oxygen content in the exhaust gas, and the engine operating
conditions. When the system is in the open loop mode, the air/fuel mixture will be based on a predetermined ratio that is dependent on several engine
operating conditions.
