BY Frank Massey In this issue I intend to discuss recent challenges in the workshop, focusing on the function of the systems under investigation and the options of test technique. Antilock braking systems have been with us for many years. Following on from electronic ignition and fuel delivery, it was the third most common system to be fitted. Relatively reliable and with little or no prospect of repair, the diagnosis is the primary challenge as replacement parts are expensive. As I write this piece, we have an Audi 28 AFTERMARKET APRIL 2024 TECHNICAL www.aftermarketonline.net A MONTH IN THE LIFE OF A VEHICLE TECHNICIAN A “Superb” opportunity for Frank to cover the importance of accurate voltage and current measurement recently presented itself A6 in the shop requiring a replacement ABS control module with the OEM price of £2,200! The most common system failures are the wheel speed sensors. They share a much more integrated responsibility in current chassis systems. The functional output is wheel rotation frequency. This is achieved by inductive or active sensor technology. The output is shared for multiple chassis systems; Braking, tyre pressure monitoring, vehicle speed indication, traction control, hill start, Stop/Start, navigation, and dynamic stability. Part 12 Fig. 2 Fig. 1 Fig. 3
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