Gear Lockout: Description and Operation

System Description
At a vehicle speed of 12 mph (20 km/h) or more, the ECM receives a signal from the vehicle speed sensor (VSS) and activates the reverse lockout solenoid, which pushes the select lock cam B into the locked position. As a result, the select lever cannot rotate to the reverse select position, making it impossible to engage reverse gear. At a vehicle speed of 9 mph (15 km/h) or less, the signal from the VSS is interrupted, the ECM turns off the reverse lockout solenoid. The select lock return spring pulls back the select lock cam B, enabling the select lever to move freely so the reverse gear can be selected.