Converter lockup control device for automatic transmissions Function and operation - A device designed to manage torque converter lockup in automatic transmissions. It detects the vehicle speed via the electronic speed sensing system and engages the lockup clutch at appropriate conditions. - It also opens and closes the engine cooling fan and modulates fan speed to match cooling demand. Why you need it - Helps reduce torque converter slip during steady driving, supporting smoother operation and potential fuel efficiency gains. - Provides automatic fan control to maintain optimal engine temperature, which can improve reliability and reduce unnecessary fan running. Key attributes - Function: Torque converter lockup control plus automatic cooling fan operation - Compatibility: Designed for electronically controlled automobiles with speed sensing and electronic cooling fan control - Performance: Integrates speed detection with fan actuation to respond to driving conditions Applications and use scenarios - Highway cruising: Automatic lockup engagement at steady speeds to stabilize engine load and maintain efficient operation, with fan activity tuned to prevent overheating. - Urban driving: Adaptive fan control during frequent acceleration and deceleration to keep engine temperatures within target range without excessive fan noise. - Maintenance or tuning environments: Useful for technicians to verify speed sensor input and confirm proper interaction between transmission lockup and cooling fan control in electronically controlled systems.