Vehicle Speed Sensor

The vehicle speed sensor is located on transaxle extension housing (2WD models) or on transfer case extension housing (4WD models). The engine controller uses vehicle speed (distance) sensor to detect if vehicle is moving and at what speed it is moving.

The sensor is an 8-pole switch which provides a pulse or switching rate, proportional to vehicle speed, to the engine controller. By comparing the number of pulses to time elapsed, the controller determines vehicle speed and distance traveled.

The vehicle speed sensor generates 8 pulses per sensor revolution. This signal, along with a closed throttle signal from the TPS sensor, indicates a closed throttle deceleration to the engine controller.

Under deceleration conditions, engine controller adjusts the Automatic Idle Speed (AIS) motor to maintain desired MAP value. During idle (vehicle stopped), the engine controller adjusts the AIS motor to maintain a desired engine speed.

The vehicle speed (distance) sensor input is also used to maintain speed (cruise) control operation and as a reference for Emission Maintenance Reminder (EMR) light.