Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi Im David, so the abs/trac lights are as you well know are generated by a few things. one being the wheel speed sensors of course. I see that when you spun the tire on the left rear it read 100-300 mv. that is too low of a reading. i know it depends on how fast you spin the tire but in order to be certain of the correct generated voltage, try spinning it faster to see if the ac voltage goes higher. it should get close to 500-700 mv
The wheel speed sensor (WSS) receives ignition voltage from the Electronic Brake Control Module (EBCM) and provides a DC square wave signal back to the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed, having said that take the vehicle for a spin with a abs capable scan tool and watch the wheel speed sensor outputs. if the left rear difference is more than 2mph then it is either a rust issue on that reluctor ring or a problem with the input to the ebcm
i offered a detailed description of what the problem could be. is that to your satisfaction or should i dig a bit deeper? let me know. im here for you
New expert here, would you like the repair procedures and diagrams for the C0045 from the factory service manual?