Vehicle Speed Sensor: Description and Operation
VEHICLE SPEED SIGNALHOW THE CIRCUIT WORKS
The Programmable Speedometer/Odometer Module receives a speed signal input from the Differential Speed Sensor (DSS) and uses a programmed conversion constant to convert the signal to the standard 8000 pulses per mile speed signal output. The speed signal output is proportional to the road speed of the vehicle. The Programmable Speedometer/Odometer Module supplies this signal to all components that require vehicle speed information Including the Speed Control Amplifier, the Transmission Electronic Control Assembly (TECA) (with diesel engine), and the Electronic Engine Control (EEC) Module (with gasoline engine).