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Why is it important to keep the correct gap between the sensor and exciter ring in an ABS system?
A precise gap is necessary to produce a strong, reliable signal. But if the gap is too close, metal-to-metal contact between the sensor and tone ring would damage both. Conversely, an air gap that’s too wide may produce a weak or erratic signal or no signal at all.
What causes wheel speed sensor failure?
As soon as the wheel turns, the cover is knocked off by the tone wheel teeth. It is common for dirt to accumulate on the sensor which inhibits its ability to generate a signal. Although sensors can go bad, the most common problem is faulty wiring or corroded electrical connections.
What is generated when an exciter ring tooth and gap move past the sensor tip?
The sensor’s magnet and pole piece form a magnetic field. As an exciter tooth passes by the sensor, the magnetic field is altered, which generates AC voltage in the sensor coil. Each time an exciter tooth and its adjacent space move past the tip of the sensor, an AC voltage “cycle” is generated.
Can ABS sensor cause transmission problems?
Occasionally, these sensors can fail or become faulty working intermittently sending inaccurate signals to the ECU. In your case it may be possible that the transmission is receiving a faulty signal from the ABS system.
How do I know if my tone ring is bad?
Bad ABS Ring Symptoms
- ABS Light Comes On. The most obvious indication of a problem with the ABS system is that the ABS Light appears on your car’s dashboard.
- Brake Pedal Pulsating at Low Speeds.
- No ABS function.
- Sudden braking from nowhere.
How much resistance should a speed sensor have?
A wheel speed sensor and circuit will usually have a resistance of 800 to 1400 ohms. Measure the resistance across the sensor itself if it has too much resistance.
Can a bad ABS sensor cause vibration?
Pulling the abs fuse will also cause a flashing brake light and solid abs light on your dash. By the way when you say noise and vibration, if you mean the entire car and not just the brake pedal vibrates, you have a problem with the regular brake system.