Table of Contents - Car diagnostic tool

www.obd2express.co.uk6. AbsSrs TestingABS -“Anti-lock Braking System” in most vehicles is made up ofan electronic hydraulic pump of two, three or most commonly fourWheel Speed Sensors (WSS), a G-force sensor, a Vehicle SpeedSensor and an ABS Control Module (EBCM). The EBCM isconstantly monitoring the WSS, the Vehicle Speed Sensor, and theG-sensor.Diagnosing an ABS problem should always start with a visualinspection of all brake components, then you will need to retrieveABS DTCs to tell you where the problem is.SRS - “Supplemental Restraint System” is made up of ImpactSensors, a Control Module, and Airbags. When the impact sensorsdetect a collision they send an extremely fast signal to the controlmodule, which relays that signal to the airbags, deploying them tohelp prevent vehicle occupants from hitting interior objects such assteering wheels, dashboards, and the like. When the control moduledetects a problem with the airbags or sensors the MalfunctionIndicator Light (MIL) will turn on.The ABS/SRS diagnostic function is used to retrieve and clearcodes from the vehicle’s ABS/SRS systems. It also provides thedefinition of each code to help diagnose problem areas withinthe systems that may cause the Malfunction Indicator Light(MIL) to turn on.NOTE: Autel accepts no responsibility for any accident orinjury arising from servicing the ABS/SRS systems. Wheninterpreting DTCs retrieved from the vehicle, always followthe manufacturer’s recommendation for repair.NOTE: All software screens shown in this manual areexamples, actual test screens may vary for each vehicle beingtested. Observe the menu titles and onscreen instructions tomake correct option selections.48