MECHATRO Spark Control (Ms) System
On Starlet models with 5-speed manual transmissions, the ECU controls spark timing. The ECU contains preprogrammed information which has all the data necessary for maintaining optimum ignition timing under all operating conditions. Input from the various data sensors allows the ECU to deliver spark at exactly the right moment.
NOTE:
The ECU of the ECS is not interchangeable with the ECU of the ECT system.