Technology and Security: NTK guides on diagnosis and exchange of ABS sensors

Professional maintenance and use of correct parts are essential for the safe operation of ABS sensors.

São Paulo, agosto de 2025 - With the advance of automotive technology, ABS Sensors (Anti -Broching Brake System) became part of a broader set of driving assistance systems, as cruise control, stability, traction, RAMP DREAM CONTROL, automatic transmissions and instrument panels, fornecendo dados fundamentais ao funcionamento integrado do veículo. In order to guarantee its full performance, The NAT, brand of Niterra, Japanese multinational also responsible for NGK and reference in components for ignition systems, lists signals that may indicate problems in performance and guide how to deal with each situation.

1. ABS light on the panel - It may be a consequence of defect in the sensor, Failure in the electric whip, crash in the ABS center or dirt on the phonic wheel. The correction includes diagnosis with scanner, Sensor repair or exchange, cleaning and, if necessary, ABS Central Replacement.
2. Incorrect reading or absence of wheel speed reading - may be the result of damaged or misaligned sensor, poriced phonic wheel with broken teeth and, In Hall Sensors, defective magnetic ring bearing. The correction involves checking sensor alignment, replace the phonic wheel or bearing and ensure the correct assembly of the sensor and supports.
3. INCORRECT ACTION OF THE ABS (TRIING OUTS) - occurs when the sensor sends wrong readings due to dirt on the phonic wheel, damage to magnetized bearing or poor contact in the electrical whip, making the system falsely interpret a risk of locking. To solve, It is necessary to use an automotive scanner and oscilloscope to confirm that the failure comes from the sensor, Fonic wheel/bearing or whip.
4. Failure after maintenance or replacement of parts - It appears in cases of incorrect bearing assembly, Choice of inadequate part or tightening with torque outside the specification, compromising sensor alignment. It is necessary to make the replacement following the application catalog, cleaning the area and applying the recommended torque to maintain the correct alignment of the sensor.
5. Problems after accidents or contact with water - results from mechanical or electrical damage caused by the impact, in addition to infiltration that can oxidize connectors and distort the signal. Adopt preventive measures, How to avoid high pressure jets in sensors, inspect cables after impacts or contact with water and perform services with only qualified professionals.

Problem Identification and Exchange Procedures

The efficient diagnosis of the ABS system is made with automotive scanner and, in some cases, with tread test, being essential to understand the two main types of sensors. The inductive sensor generates analog signal and requires resistance verification, Signal and Fonical Wheel Conditions, while the hall sensor produces digital signal and demands food tests, signal analysis and inspection of magnetized bearings.

“In addition to sensors, Damage in the electric whip are frequent, often caused by animals or accidents. Common causes of failure are also water infiltration, Electric power failures, incorrect assembly of bearings and impacts arising from accidents. Therefore it is essential to perform maintenance with the proper frequency, always conducted by trained professionals ”, explains Hiromori Mori, Niterra Technical Assistance Consultant.

When the exchange of a sensor is necessary, It is important to follow fundamental steps: accurate diagnosis, Use of the correct part consulting the updated catalog, cleaning before installation, Application of proper torque and tread test. Some models still require the sensor presentation procedure via scanner.