Vehicle Speed Sensor

The VSS generates 8 pulses per axle shaft revolution. The SBEC will interpret speed sensor input along with throttle position sensor closed throttle input.

This will allow SBEC to differentiate between closed throttle decel and closed throttle idle (vehicle stopped) conditions. During decel, SBEC controls Automatic Idle Speed (AIS) motor to maintain a desired manifold pressure value. During idle (vehicle stopped), SBEC controls AIS motor to maintain a desired idle speed.