BY Frank Massey I left off last month with the problems that poor parts choice create and how this affects a professional and efficient repair. A remarkably similar experience occurred this month, following a simple requirement for a brake master cylinder swap-out on a Volvo XC60 2.4 diesel from 2016 with 60,000 miles on the clock. A hydraulic leak dictated a new replacement. This awkward-rather-than-challenging task was competently conducted by one of our workshop techs. Following the repair, the owner was experiencing the vehicle alarm going off. My first task was to conduct a battery test. The main service battery was fully serviceable; However, the auxiliary battery had a blown 70amp control fuse. Response Once replaced, the next problem was a loss of comms with the central electronics module U014000. Further examination of serial data with TOPDON indicated no response from the brake pedal switch. This switch uses a Hall Effect position sensor, as do most brake and clutch pedal sensors. The sensor was fully evaluated with my scope, confirming no change of status. I established that the new master cylinder was not supplied with a sensor pre-fitted. Instead, there was one that had been supplied by a well-known national discount parts supplier, based on low-cost. Here we go again… Passing a small magnet across the Hall Effect IC should prompt a response across the Hall gate, which it did. So, the sensor was operating correctly. Further enquiries from the so-called supplier’s technical support team confirmed 26 AFTERMARKET JUNE 2023 TECHNICAL www.aftermarketonline.net A MONTH IN THE LIFE OF A VEHICLE TECHNICIAN Frank’s Eldon Street Garage adventures continue with a host of unlikely vehicle faults being sent to test his knowledge and abilities that the correct master cylinder was supplied despite there being two distinctive options; Stop and non-stop/start. Further examination confirmed the internal hydraulic piston had no phonic generation element. Fitting a genuine part cured all comms and service errors. It even came with a new Hall sensor. My next task was more conventional in nature relying on experience, process, and accurate data, it did however expose my total lack of Renault product knowledge. The vehicle was a Renault Captur Dynamique, 1.5 diesel 2014 with 35,000 miles on the clock. It all began with an Part four Fig. 1
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