Anti-Lock Brake System Speed Sensors

Purpose

• The anti-lock brake system (ABS) sensors monitor the vehicle wheel speed
• The ABS control module uses the information received from the ABS wheel speed sensors for several systems such as anti-lock brake, traction control and stability control systems.

Function

NTK anti-lock brake system (ABS) sensors are available in either analog (inductive principle) or digital (hall effect) technologies. The two technologies are not interchangeable.

• Analogue (Inductive) Passive Sensor
  • Generates a signal, no external power supply
  • Wave-form output signal
  • Only signal when wheel turns
  • Voltage rises with wheel speed, and depends on distance to wheel (“G“)
  • 2 or 3 Pins (3rd for shield)

Digital (Hall Effect) Active Sensor

• Integrated electronics
• External power supply
• Square output signal proportional to wheel speed
• Can detect a position even if the wheel is at a standstill
• 3 Pins

Position

At each wheel, the differential or transmission tail shaft housing

Cause for replacement

• ABS/brake lamp illumination
• No/erratic ABS operation
• No/erratic traction control operation
• No/erratic stability control operation

Anatomy and Construction

The NTK Difference

• Glass reinforced plastic for superior resistance to contamination
• Includes all necessary brackets and hardware
• Application specific harness length