ABS Speed Sensor
A speed sensor in a vehicle plays a crucial role in measuring the speed at which the vehicle is traveling,which measures the speed of the vehicle as a whole.
OE Number
WHT003863
ALS2415
6Q0927807B
6Q0927807A
6E0927807B
0986594502
Compatible Applications
AUDI A2 (8Z0) (2000/02 - 2005/08)
AUDI A1 (8X1, 8XF) (2010/05 - /)
AUDI A1 Sportback (8XA, 8XK) (2011/09 - /)
VW POLO (9N_) (2001/10 - 2012/01)
VW DERBY Saloon (9A4) (2002/09 - /)
VW FOX (5Z1, 5Z3) (2003/10 - /)
VW POLO (6R, 6C) (2009/06 - /)
VW UP (2011/08 - /)
VW VENTO Saloon (60) (2009/05 - /)
Skoda FABIA (6Y2) (1999/08 - 2008/03)
Skoda FABIA Combi (6Y5) (2000/04 - 2007/12)
Skoda FABIA Saloon (6Y3) (1999/10 - 2007/12)
Skoda FABIA Praktik (2001/07 - 2007/12)
Skoda FABIA (2006/12 - 2014/12)
Skoda FABIA Combi (2007/10 - 2014/12)
Skoda CITIGO (2011/10 - /)
Skoda RAPID (NH3) (2012/07 - /)
Skoda RAPID Spaceback (NH1) (2012/07 - /)
SEAT IBIZA Mk IV (6L1) (2002/02 - 2009/11)
SEAT CORDOBA Saloon (6L2) (2002/09 - 2009/11)
SEAT IBIZA V (6J5, 6P5) (2008/03 - /)
SEAT IBIZA V SPORTCOUPE (6J1, 6P1) (2008/07 - /)
SEAT IBIZA V ST (6J8, 6P8) (2010/03 - /)
SEAT Mii (KF1_) (2011/10 - /)
SEAT TOLEDO IV (KG3) (2012/07 - /)
Function
- Speed Measurement: The wheel speed sensor detects the rotational speed of each wheel.
- ABS Function: Used primarily for Anti-lock Braking System (ABS), traction control, and stability control systems.
- Signal Generation: As the wheel rotates, the sensor generates a signal that indicates the speed and rotational direction of the wheel to the ABS control module or traction control system.
Components
- Magnetic or Hall Effect Sensor: Utilizes a magnetic or Hall effect sensor to detect the presence of a toothed reluctor ring attached to the wheel hub or axle.
- Wiring: Connects the sensor to the vehicle’s ABS or traction control system, transmitting speed signals.
- Mounting Location: Positioned near the wheel hub or axle where it can accurately detect wheel rotation.
Operation
- Signal Generation: As the reluctor ring rotates with the wheel, it passes in front of the sensor. This causes changes in the magnetic field or interrupts the Hall effect sensor’s signal, generating a pulse signal.
- Signal Interpretation: The ABS or traction control system interprets the frequency of these pulses to determine wheel speed. Rapid changes in pulse frequency can indicate wheel slip or lock-up, prompting the ABS system to intervene.
Importance
- Safety: Crucial for ABS functionality, ensuring safe braking by preventing wheel lock-up and maintaining vehicle stability during braking.
- Traction Control: Provides input to traction control systems, which adjust engine power or brake force to prevent wheels from spinning during acceleration.
- Stability Control: Aids in vehicle stability control by detecting and correcting oversteer or understeer conditions through individual wheel braking.
Maintenance and Troubleshooting
- Cleaning and Inspection: Ensure sensors are free of debris and properly aligned with the reluctor ring to maintain accurate speed detection.
- Testing: If there are ABS warning lights or issues with traction control, wheel speed sensors can be tested using diagnostic tools to verify signal output and functionality.
- Replacement: If a wheel speed sensor fails due to damage, wear, or electrical faults, replacement may be necessary. Replacement involves disconnecting electrical connectors and removing the sensor from its mounting location.
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