Vehicle Speed Sensor: Description and Operation

Vehicle Distance (Speed) Sensor Location:

Location

Sensor mounted in transaxle extension housing.

Purpose

1. The PCM uses sensor input with input from Throttle Position Sensor (TPS) to determine whether the vehicle is decelerating or stopped at idle.

^ During closed throttle deceleration, (slower signals received from sensor), PCM actuates IAC motor to maintain desired MAP sensor value.

^ During idle, (no signals being received from sensor), PCM actuates Idle Air Control (IAC) motor to maintain desired engine idle speed.

2. The PCM uses sensor input to update distance travelled in memory (every 8 miles).

3. The PCM uses sensor input to control speedometer.

Operation

During idle, (no signals being received from sensor), the PCM actuates the Idle Air Control (IAC) motor to maintain desired engine idle speed.

During closed throttle deceleration, (slower signals received from sensor), the PCM actuates the IAC motor to maintain desired Manifold Absolute Pressure (MAP) sensor value.

Sensor generates 8 voltage pulses per axle shaft revolution.