May 2019

MAY 2019 AFTERMARKET 23 EYEBROW www.aftermarketonline.net TRAINING COURSES OFFERED ȏ ΖQWURGXFWLRQ 7R 'LDJQRVWLFV 'D\ ȏ &RPPRQ UDLO GD\ ȏ %DVLF RVFLOORVFRSH GD\ ȏ $GYDQFHG RVFLOORVFRSHV GD\ ȏ 'LUHFW SHWURO LQMHFWLRQ GD\ ȏ (QJLQHPDQDJHPHQW IXHO WULP GD\ ȏ 7XUER V\VWHPV WHVWLQJ GD\ ȏ ΖJQLWLRQ V\VWHPV GLDJQRVWLFV GD\ ȏ 'SI WHVWLQJ UHSDLU UHJHQHUDWLRQ WHFKQLTXHV GD\ ȏ &LUFXLW WHVWLQJ XVLQJ KRRN SRZHU SUREH ȏ &RUSRUDWH DQG EHVSRNH WUDLQLQJ Frank Massey is one of the UK’s leading experts in vehicle Diagnostics with over 40 years of industry experience. He is renowned in the motor industry for his unrivalled expertise and knowledge as well as running a successful commercial workshop. 2XU WUDLQLQJ FRXUVHV DUH PRGXODU EXLOGLQJ ERWK H[SHULHQFH DQG FRQȴGHQFH LQ D 6Ζ03/( 72 81'(567$1' DSSURDFK ZH FRYHU D ZLGH UDQJH RI VXEMHFWV LQWURGXFLQJ WRROV DQG WHFKQLTXHV GHYHORSHG LQ WKH $'6 ZRUNVKRS )RU PRUH LQIRUPDWLRQ SOHDVH FRQWDFW $QQHWWH (PDLO annette@ads-global.co.uk | 3KRQH 01772 201597 www.autoinform.co.uk so much, more powerful and trustworthy, however it does not and will not replace the functions available from an oscilloscope. Specialist mechanical tools and assembly techniques prohibit casual examination, due to cost or the ever more common single fitment parts. Data extraction This may lie in a multitude of directions; Physical extraction, camshaft timing, fuel quantity per stroke via the serial port or fuel pressure rise time via the scope. We are forced to monitor not just a physical value, but not how the PCM is adjusting or adapting a value. How do we know the parameters of operation when VMs are removing more and more data in favour of the pass-fail flags from a software automated test profile? SENT Rieve gauche, no not a walk along the Left Bank, but a completely new protocol for data and diagnostic transmission. SENT has been developed specifically for automotive applications, rather than being a black-market hooky copy from other engineering developments. SENT stands for single edge nibble transmission, and is a uni- directional out-only data line to the PCM. SENT is essentially a serial interface, used predominantly with throttle position, air mass and temperatures. The basic unit of time is the tick, with a minimum data unit nibble. 0Data transmission speeds over fast or slow channels, where bitrate can also vary: 1xtick= 3us. In essence it is very similar to a single channel can transmission, where the function includes synchronisation, calibration, CRC and checksum. How am I to challenge the authenticity of data? For example, sensor error may come from power or ground discrepancies, range error, environment influences, calibration error or simply a genuine condition fault. Its design is of course intended to provide an autonomous diagnostic platform via the serial port, excluding any assessment by the techs. Full circle What does this mean for the industry? I suspect it will go full circle back to the 1970s, when part swapping was the norm for Christopher Columbus frauds. Right: SENT in action 2