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Connections: 1) With the IGN off, connect a 3A fused jumper from B+ to the Supply Voltage terminal of the wheel speed sensor. Install the new sensor. The ABS module monitors the change in frequency and amplitude as the wheel rotates. Using a Digital Volt-Ohmmeter (DVOM), measure the resistance (ohmmeter function) between the sensor terminals. Reinstall the wheels and tighten the lug nuts using a tire iron. Attach one of the multimeter's probes on one flying lead and the other probe on the next lead. If the leads are reversed, you will get an infinite reading indicating an open circuit. If your vehicle's speedometer stops working or isn't telling you the correct speed that you're traveling, you likely have a faulty VSS. An ABS (anti-lock brake sensor) is a tachometer that measures the rapidity of a wheel. A sensor might not display 0 mph, but 3-5 mph; this is normal. Any of the wheel speed sensors that reads a number below or above "Zero" when the car is not moving is the culprit. If you do measure an active sensor with a meter, it will produce a reading around 3.5 millions ohms. FREE Shipping on orders over $25.00. Vehicle Speed Sensor Testing Turn the ignition switch to the OFF position. Mar 29, 2015. You can test your VSS to make sure it's functioning properly by using a device called a multimeter. Only 16 left in stock (more on the way). Disengage the wiring harness connector from the VSS. Prep your car. The "Live Data" results are arranged in alphabetical order . 1) Turn IGN to OFF and remove the key 2) Open and then close the driver's door and wait for at least 60-secs before proceeding 3) Disconnect the suspected wheel speed sensor 4) Using your multimeter set to DC volts and the range to 40-60-volts, touch the probes to the supply voltage and signal circuits from the EBCM 5) Then turn the IGN to ON. First off is testing the 2 wire speed sensor. Plugin the sensor and start your vehicle. Chevy Silverado 1500 has a speed sensor at each wheel hub which measures the speed of the respective wheel and transmits the information to the ABS control unit. Working with the Voltmeter Those terminals that you exposed are going to be used with the voltmeter. When the ABS light / comes on in your Colorado, the anti-lock braking system is disabled. The polarity changes from positive to negative as the tone ring passes by the magnetic field. . Spin the hub or wheel at about 1 revolution per second (approximately 5 MPH). Connect your AC voltmeter to the sensor leads. Locate the vehicle's fuse box and check that the fuse connecting the wheel speed sensor is not burnt. Ships from and sold by Amazon.com. This is what sets the pre-load on the bearing. They start out by attaching the red lead to the signal output and the ground lead (black) to the ground on the speed sensor. Vehicle Speed Sensor Replacement It then passes the calculated rotational speed to the Engine Control Module (ECM). If the voltage reading is low or nonexistent, check the sensor's resistance (with the key off). 2) Connect a jumper in series with a 100-ohm resistor to the negative terminal of the battery. GM and supplier ZF Active Safety conducted testing and isolated the problem to specific vehicles with 5.3-liter engines traveling in four-wheel-drive. These sensors are vital for proper operation of the anti-lock braking system. It is possible to harm the wheel speed sensor if the polarity is reversed. This should also be done at the breakout box. Check the rest of the sensors that are connected to wheel speed following this same procedure. Leave the key turned on, with the engine still offtest for any power, as well as a ground from the computer. Consequently, lift your car using a jack to remove its tires. Every car wheel has its rotational speed, the ABS sensor notes these speed rates. Reconnect the wheel speed sensor jacks once finished the operation. From the screenshot above, the faulty/bad ABS sensor is the one located in the "Left rear wheel hub.". Take a test drive. A good wheel speed sensor will typically produce an alternating current (AC) voltage reading of 50 to 700 MV when the wheel is turning one revolution per second. This power-on test is intended to check for speed continuity and shorts. Disconnected the sensor to check the resistance and got nothing, as in infinite resistance. Make sure that the drive wheels are suspended at the same time the transmission is put into gear. Complete the circuits using flying leads, i.e., both female ports on the socket should be connected to the males on the speed sensor by the fly leads. After that, make use of the transmission usually located in the park settings together with the emergency brake. $19.51. Read the AC voltage produced by each sensor. Loss of a wheel speed signal is a serious problem because the ABS module needs accurate input from all its sensors to determine . The passive speed sensor uses a magnet with fine copper wire wrapped around it to create its own alternating magnetic field. Assuming the sensor is bad since they should have some resistance but checking here to make sure before getting a replacement. The newer active sensor uses a digital signal created by the ABS controller. N NickD Banned Joined Dec 10, 2011 10,296 Posts Connect the new sensor to the vehicle's wiring. The difference in the ohm or voltage indicates a wire break, short, or a defective sensor. See more product details. The ABS is also known as the wheel speed sensor or ABS brake sensor. Chevy Silverado 1500 - (Jonathan Weiss / Shutterstock) Don't be confused by other wiring harnesses that may lead down to the wheel such as the brake pad wear sensor. When testing the speed sensors, you need to first prepare your vehicle by setting it on level ground and then switching off its engine. These sensors are self powered, meaning the revolutions inside the case generate the signal needed to create movement in the speedometer. This frequency changes with wheel speed. This item: ACDelco GM Original Equipment 22821303 Front Wheel Speed Sensor. This is a digital type wheel speed . In this video we are working on a 2006 Chevy Colorado with a left front wheel speed sensor code. Start the engine. Lower your car. Getting a code for ABS malfunction referring to the left front wheel. New (19) from $19.39 & FREE Shipping. Support us on Patreonhttp://www.patreon.com/TheMechanicCheck out my personal blog where I talk about Mechanic and Service Businesses.http://www.NestorMendoza. Along with these terminals, you can also see the voltmeter probes. It reads 255 even though the car is at a standstill. Vehicle speed sensor accuracy is vital. Check to make sure . Step 1: Locate and Remove the Connector Locate the electrical connector from a particular the wheel speed sensor which is near the frame in the wheel well in most cases. A vehicle speed sensor, or VSS, is a sensor that is used to determine how fast your vehicle is traveling. Manufactured with GM Original Equipment specification for fit, form, and function. Diagnosing Antilock Brake Wheel Speed Sensors. You must also use a new nut instead of re-using the old one according to the factory service manual. IF you remove the wheel hub containing the wheel bearing, you must re-torque the axle nut to the specified torque. If the resistance is 190-250 ohms, the sensor is okay. RESISTANCE TESTING ACTIVE WSS CANNOT BE TESTED BY USING THE RESISTANCE ACROSS THE SENSOR. +. GM is using wheel speed sensor recall . This is a digital type wheel speed sensor, so testing method. The only major symptom of bad wheel speed sensor in Chevy Colorado is the ABS warning light comes on in the instrument cluster, and the anti-lock braking system is disabled. The sensors output an Alternative Current (AC) voltage that is generated when a toothed tone ring or reluctor passes by the sensor. This will expose the sensor terminals that you will need for testing purposes. If all the wheel speed sensor circuits pass the resistance test, you can test the output of each sensor. The vehicle can still be braked without ABS. When a wheel speed sensor (WSS) fails or there's a problem in the sensor's wiring circuit, it usually disables the ABS system and causes the ABS warning light to come on. Using the proper socket, remove the faulty sensor. Test your signal return wire for a lab scope signal. Disconnect the sensor wire by unlocking the safety clasp and pull it away gently. This is still a .6-volt square wave like is seen above. 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