How does ABS communicate with other onboard computers?
The ABS module communicates with other onboard computers (referred to as modules) over the controller area network (CAN) bus. The bus is composed of two lines: CAN High and CAN Low. Modules communicate over the CAN High bus at a rate of 500k bits/second, whereas communication over the CAN Low bus is limited to 125k bits/second.
What does lost communication with ABS module mean?
Code U0121 stands for Lost Communication with Anti-lock Brake System Module. Anti-lock brakes are required on all modern vehicles. The antilock braking system (ABS) prevents wheel lockup by modulating the brakes in an emergency situation.
What is the name of the ABS module?
ABS control module: The ABS module is the computer in charge of monitoring and controlling the ABS system. The ABS module may also be referred to by other names, such as the Electronic Brake Control Module (EBM). Wheel speed sensors: Wheel speed sensors provide input to the ABS module regarding vehicle speed.
What should I do if my ABS module is not working?
An ABS module that does not respond to the scan tool will need to be diagnosed. Before condemning the ABS module, its circuit should be checked with a DMM. Like any other electrical device, the ABS module must have proper power and ground. If everything up to this point checks out OK, the ABS module is likely the problem.
How to check ABS pump Supply in Jeep?
Check (Z907) or (Z917) ground circuit for an open or high resistance Using a 12 volt test light connected to 12 volts, probe the (Z907) and (Z917). The test light should illuminate brightly. Compare the brightness to that of a direct connection to the battery.
The ABS module communicates with other onboard computers (referred to as modules) over the controller area network (CAN) bus. The bus is composed of two lines: CAN High and CAN Low. Modules communicate over the CAN High bus at a rate of 500k bits/second, whereas communication over the CAN Low bus is limited to 125k bits/second.
What does lost communication with anti lock brake system ( ABS ) mean?
Lost Communication With Anti-Lock Brake System (ABS) Control Module. What does that mean? This is a generic communication system diagnostic trouble code that applies to most vehicle makes and models. That may include but are not limited to vehicles from Mazda, Chevrolet, Dodge, VW, Ford, Jeep, GMC, etc.
What should I do if I lost communication with ABS module?
If U0121 is the only DTC stored, the ABS module itself should be checked. In most cases, a professional will start by trying to communicate with the module using a diagnostic scan tool. The tool connects directing to the vehicle’s diagnostic port. Once connected, it can communicate with all modules on the network.