MEM-CAL (Memory And Calibration Unit)

The MEM-CAL unit incorporates the functions of the PROM and CALPAK into one unit. It contains factory programmed information on engine calibration, vehicle weight, transmission usage, and rear axle ratio. It also contains the back-up fuel control circuitry required to keep the vehicle operable enough to get it to a repair facility in the event the ECM becomes damaged or defective. If battery voltage is removed, MEM-CAL information will be retained. The MEM-CAL unit can be removed from the ECM.