Serial Communication Interface (Sci)

This uses a integrated computer which contains both the ECM and the TCM within the same unit. We will refer to this unit as integrated ECM.

Fig 1: Throttle Opening To Engine RPM Graph

Courtesy of HYUNDAI MOTOR CO.

Uphill (above 5%) longer than 1.5sec.: Reducing speed Lock-up During this control, the vehicle is running uphill (less than 2.5%) for 1 sec, the partial lock-up control is functioned again.

Fig 2: TCM - ECM Communication Diagram

Courtesy of HYUNDAI MOTOR CO.

Communication Speed: 15.625Kbit/sec

Frequency: 20ms

If a fault occurs in either ECM or TCM, the entire integrated ECM must be replaced.