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.