how to test an abs sensor with a multimeter

How to Test an ABS Sensor with a Multimeter? You Need To Know!

Modern cars have Anti-lock Braking System (ABS) sensors that collaborate with the ECU to regulate the power of the brakes when you try to stop your automobile. The sensors, which are connected to the wheels by a harness, track the speed of rotation of the wheels and utilize this information to detect whether the wheels are locking up. A malfunction with the ABS sensors may cause harm to your life. Hence, when the traction control system light or the ABS light illuminates, immediate action is necessary. How to test an ABS sensor with a multimeter? Let’s find out.

What is an ABS Sensor and How Does It Work?

A wheel’s speed is measured by a tachometer called an ABS (anti-lock brake sensor). The Engine Control Module (ECM) receives the calculated speed of rotation after that.

The wheel speed sensor and ABS brake sensor are other names for ABS. Every car wheel rotates at a different speed, which the ABS sensor records.

The ECM evaluates each wheel’s locking-up state after receiving wheel speed reports. ECM locking-up mechanisms are the cause of a sudden grinding sound coming from the brakes.

ABS sensor will assist in controlling the car’s motions in shaky situations if your vehicle also has traction control. One wheel may move faster than the others as the grip is lost, which could cause the traction control system to engage.

You risk losing electronic balance and traction control if your car’s ABS is broken. Driving a car without having knowledge of the ABS sensor is, therefore, risky.

Why Would you Need to Test an ABS Sensor?

When ABS sensors are not working properly, while braking, the vehicle becomes unstable. So we need to test the ABS sensors to not get into an accident.

Following are some reasons to test the sensors.

  • Lighting of ABS Lights

There are numerous warning lights and indicators on the dashboard of the car. These cautionary lights and symbols denote several issues. The ABS light being illuminated is a sign that there might be an issue with the ABS system or with any of the ABS sensors.

  • No Longer Having Anti-lock Brakes

The anti-lock brakes could malfunction as a result of a bad ABS wheel sensor.

  • Brakes Take Longer to Stop the Car

There can be a problem with your ABS system if it takes your automobile a long time to stop in difficult braking situations while also experiencing skidding or traction loss. There might be a problem with your ABS sensor if it takes your car’s brakes longer to bring it to a complete stop. Braking issues may result from malfunctioning sensors.

  • The Traction Control System is Inoperative

Traction control system performance may be halted by a damaged ABS sensor.

How Do you Locate the ABS Sensor on your Car?

The tires have an “ABS sensor,” which is another name for a wheel speed sensor. It typically lies on the hub’s backside. In some rear-wheel-drive cars, the ABS sensor may also be installed in the differential.

Four ABS options are available here.

  1. Four-sensor ABS: Each wheel is evaluated separately using a sensor.
  2. 2-channel 4-sensor ABS: There is one sensor within each wheel, but there are two channels—one in the front and one in the back.
  3. 4-sensor 3-channel ABS: Under this sort of ABS system, there is a sensor at each wheel, but the controller drives the back wheels.
  4. 3-channel, 3-sensor ABS: This version has one sensor on the back axle, and one sensor is on each of the front wheels.

How Do you Locate the ABS Sensor on your Car

How to Test an ABS Sensor with a Multimeter?

Use a multimeter to test each ABS sensor by following these easy instructions. Remember to verify all the sensors and the number of wheels with ABS sensors in your manual.

Please take note of their typical Ohms value.

  1. Before you power off your engine, park your car and make sure the gear is in the “park or neutral” position. Set your hand brake after that.
  2. Lift the wheel close to the ABS sensor you would like to test using the jack.

It would be advisable to place a mat on the ground beneath the automobile before beginning in order to lay and work comfortably. Remember to wear your safety equipment.

  1. Safely remove the ABS sensor’s lid to disconnect it from the wiring. Then use brake cleaner to clean it (the sensor has connecting wires, and it is like a canister)
  2. Set Ohms on your multimeter. Rotate the knob to the Ohms level simply but firmly. The symbol “Ω” stands for the Ohm or resistance.
  3. By steadily rotating the zero-adjust knob, you can set the multimeter to read zero.
  4. On the sensor pins, place the probe leads. Which end of each probe you place does not matter because resistance is non-directional. So, to get the right reading, place it as far apart as you can. Wait until you have a reliable value.
  5. Keep in mind or note down the Ohms readings. Compare it to the sensor’s general Ohms value listed in the user manual guide. Less than 10% should separate the two. If not, you must replace the ABS sensor.

What Do you Do If the ABS Sensor Fails the Test?

The ABS sensor needs to be replaced if you don’t get a reading from the multimeter after checking it. Update the wheel speed sensor with a new sensor and repeat the precise “ohm” test to determine the problem. As a potential repair for an ABS sensor, you may have to repair the wire.

If one ABS sensor needs to be fixed, it will likely be the ABS sensor wire. You must solder the damaged wire on the ABS sensor in order to complete the repair. The ABS sensor wire may, sometimes, be beyond repair, in which case a total replacement will be required.

To replace the ABS sensor, you should consult a professional.

How Do I Reset My ABS Sensor?

Put the key in the lock and maintain it in the “on” position without turning it to start the car. The ABS lights will come on. Then start your engine by depressing the gas pedal three times. The ABS reset procedure is now finished. The lights will eventually remain off. If the light hadn’t turned off, take the car for a trial run and speed up above 15 miles per hour.

Watch this one,

Video Credits – Valley Mobile Automotive

You May Also Like

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *