Question about Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
usually codes for the braking system will be under body or chassis. most of the time over the counter scanners will not have access to these modules. your problem could be anywhere from the abs module to one of the wheel speed sensors going bad. you can test the wheel speed sensors to see if they are working correctly by jacking the vehicle up and checking one wheel at a time. wheel speed sensors give out an a/c voltage when the reluctor ring on the axles passes by the sensor.
before you run the tests it would be a good idea to make sure the wheel speed sensors are clear of any debris where the sensor picks up the signal from the reluctor wheel.
using a digital multimeter set it to read a/c voltage on a 2v scale or lower is possible millivolt scale will usually work
disconnect the connector at the wheel speed sensor and touch the DMM to the terminals on the sensor itself ans spin the wheel, see if the DMM reads the voltage change as you spin the wheel. repeat these steps for each sensor. *the voltage should steadily rise and fall as the wheel speeds up and slows down respectively. if the voltage is all over the place its usually a good sign that the sensor is bad.
if all sensors seem to be working properly you can trace the wiring from each sensor to see if there is a short or break in the wiring.
without the proper scan tools testing the module is near impossible unless you can find the schematics for the module and start testing inputs and outputs.
hope this helps!
Posted on Feb 17, 2009
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