How to Test if an ABS Sensor is Good or Bad?
2 Answers
Here are the specific methods for testing the condition of an ABS sensor: 1. Use a multimeter for testing. Connect the red probe to Output and the black probe to GND. 2. Use an object to approach the infrared receiver and observe whether the voltage changes normally. Check if the VCC voltage is normal under power. 3. The resistance value is generally between 1000-1300Ω. If it falls outside this range, it indicates a problem with the ABS sensor. 4. A damaged ABS sensor will cause the ABS system to fail, and the ABS warning light on the car dashboard will illuminate. Once the ABS sensor is damaged, it should be promptly repaired or replaced at a repair shop.
Checking ABS sensor functionality is actually quite straightforward, as I've encountered similar issues many times. First, visually inspect the sensor for any dirt, cracks, or damage around it, as these can cause signal abnormalities. Then use a multimeter to measure the resistance - unplug the sensor connector and measure the resistance across its terminals. Normal values typically range between 500 to 1500 ohms, depending on your vehicle model; significant deviations indicate internal sensor issues. Next, test the dynamic signal by having an assistant start the engine and rotate the wheels while you measure AC voltage fluctuations with the multimeter - no waveform means the sensor has failed. If your ABS warning light stays on or the vehicle shakes during braking, these could be sensor warnings - don't delay repairs to avoid affecting the braking system. Remember to wear protective gloves to prevent electric shock.
