Specification:

• The vehicle speed sensor (VSS) measures transmission/transaxle output or wheel speed. The ECM uses this information to modify engine functions such as ignition timing, air/fuel ratio, transmission shift points, and to initiate diagnostic routines.
• The VSS signal originates from a sensor measuring transmission/transaxle output speed or wheel speed. 
• Different types of sensors have been used dependingon models and applications. 
• On some vehicles, the vehicle speed sensor signal is processed in the combination meter andthen sent to the ECM. 
• On some anti-lock brake system (ABS) equipped vehicles, the ABS computer processes thewheel speed sensor signals and sends a speed sensor signal to the combination meter andthen to the ECM. You will need to consult the EWD to confirm the type of system you are workingon.
• Replaces dealer part numbers:SC37, E45F9E731AA, E45Y9E731A, E6DF9E731DA, E6DZ9E731D, E8LY9E731A, E9LZ9E731A, ZZL043701, ZZL060071, ZZL243711, ZZM043711

Compatibility:

Location:

• Most mount directly on the transmission or transaxle case. They send a varying frequency to a meter in the TCM, indicating vehicle speed. A gear located on the transmission's output shaft drives the sensor.

What It Does:

• Vehicle speed sensors are usually either inductive or optical sensors. The most common inductive sensors consist of a rod magnet on top of a magnetic pin that is surrounded by a fixed coil. This sensor is mounted a fixed distance from a ferromagnetic rotor with teeth. As the rotor turns and a tooth comes into the proximity of the rod, the magnetic flux in the coil changes. This change in flux results in a voltage pulse across the coil. The vehicle's engine control module counts these voltage pulses and computes the vehicle's speed.
• Several automotive systems rely on information about the vehicle speed in order to function properly. Transmissions rely on vehicle speed information for optimizing shift strategy. Cruise control systems must monitor vehicle speed in order to make appropriate throttle adjustments. ABS systems, electronic power-assisted steering systems and engine control systems also utilize vehicle speed information. Vehicle speed sensors have traditionally been mounted on the transmission or rear differential, where they monitored the rotation speed of the drive shaft. These sensors can provide incorrect information about the vehicle speed if one or more tires do not have good traction or if the vehicle is skidding.

Failure Symptom:

• The Speed Sensor(s) measure rotational speed of the transmission shafts. Common failure symptoms include:
• Erratic Speedometer Behavior
• Harsh or Improper Shifting
• Loss of Cruise Control
• Surging or Hesitation
• Check Engine Light On

Package Includes:

• 1X Vehicle Speed Sensor