Cruise Control Electronic Control Unit (ECU)

Cruise control ECU delivers an input signal to control overdrive operation in accordance with vehicle speed when cruise control is operating. If vehicle speed drops 2 MPH less than the set speed during cruise control operation while in overdrive, overdrive is released to prevent reduction in vehicle speed. Once vehicle speed is greater than the set speed, overdrive is resumed. If coolant temperature is low, transmission will not shift into overdrive. Cruise control ECU is located next to TCM. See Figure.