The problem
It is a common problem that after replacing the ABS sensor the warning light is still lit. The standard practice of clearing the code by re-setting the ECU does not always remedy the problem.
The Investigation
- When driving the vehicle the following symptoms occur:
– Wheel traction decreases
– ABS warning light appears
- Pointing towards the ABS sensor, the part is replaced
- However once replaced the warning light still appears on the dashboard
- Even though the light remains active this doesn’t mean that the part is still at fault
- This is because the ABS sensor won’t generate a reading until the vehicle is travelling between 2-5 mph
The Remedy
- To ensure the new sensor is registered, the wheel will need to be spun by hand
- The ABS sensors on most vehicles are magnetic and generate an alternating current that increases in frequency and amplitude when the wheel speed increases
- By spinning the wheel, the sensor generates a current which will be picked up by the ECU
- This will ensure that the sensor is registered, removing the warning light from the dashboard