Vehicle Speed Sensor (VSS)

ECM receives vehicle speed signal from ABS control module 29 times per 1 wheel rotation. On M/T vehicles with T-7, this is used to limit torque applied in reverse and 1st gears by controlling throttle angle, regardless of gas pedal position. On all models, in gears 2, 3, 4 and 5, ECM uses VSS to activate fuel shutoff on deceleration. It is also used to limit top speed, and to prevent idle speed control when vehicle is moving. See appropriate SYSTEM & COMPONENT TESTING article for further diagnostic procedures.