![\"\"](\"https:\/\/www.purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/51itpsaLlfL._SX376_BO1204203200_.jpg\")
<\/a>The book isn’t the cheapest of purchases, at least not in the UK. But for me it was well worth it.<\/p>\n\n\n\n
It took an evening to read the most interesting stuff, which was the first 2\/3 of the book for me.<\/p>\n\n\n\n
There was some great stuff in there and it really helped frame the issues we were facing. It introduced me to the idea that there might be other protocols on top of the CAN bus protocol, like ISO-15765<\/a> (ISOTP) and Unified Diagnostic Services<\/a> (UDS). It also confirmed some things we’d come to think were probable, like the request\/response procedure that devices seemed to be using.<\/p>\n\n\n\n It’s always difficult to think back about what value books like this were to us in our investigations, but I think it moved me along at least a couple of weeks of regular surfing in the space of an evening.<\/p>\n\n\n\n If you’re interested in picking apart a CAR diagnostics network then this book would be a great starter. If you’re an old hand at this sort of stuff then I suspect it would be too simplistic for you, but it was a great primer for me.<\/p>\n","protected":false},"excerpt":{"rendered":" Another quick one, really quick this time… Mark (CTRMint) had been doing his research and had told us about a book he was buying, and I just couldn’t resist… The book isn’t the cheapest of purchases, at least not in the UK. But for me it was well worth it. It took an evening to […]<\/p>\n","protected":false},"author":1,"featured_media":4955,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[51,20],"tags":[34],"class_list":["post-4954","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-caterham-blog","category-ecu-diagnostics","tag-ecu-diagnostics"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/51itpsaLlfL._SX376_BO1204203200_.jpg","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8yl38-1hU","jetpack-related-posts":[{"id":5112,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2019\/09\/20\/ecu-diagnostics-part-13-three-diagnostic-protocols-in-the-mbe-9a4-ecu\/","url_meta":{"origin":4954,"position":0},"title":"ECU Diagnostics – part 13 : Three Diagnostic Protocols in the MBE 9A4 ECU","author":"John Martin","date":"September 20, 2019","format":false,"excerpt":"This one's just a short post to introduce the next three posts. In our investigations of the MBE 9A4 ECU we've found three different diagnostics protocols supported on the OBD port. The following three posts will summarise what we've learnt about each protocol and will be updated with new information\u2026","rel":"","context":"In "Caterham Blog"","block_context":{"text":"Caterham Blog","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5086,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2019\/09\/16\/ecu-diagnostics-part-12-osi-7-layers-for-caterham-diagnostics\/","url_meta":{"origin":4954,"position":1},"title":"ECU Diagnostics – part 12 : OSI 7 Layers for Caterham Diagnostics","author":"John Martin","date":"September 16, 2019","format":false,"excerpt":"Communications protocols are often called protocol stacks... they're layers, or stacks, of different protocols... one layered on top of the other from lowest level (hardware\/physical) to highest level (software application). This is where the OSI 7 Layer model comes in... it standardises how we think about the layers and allows\u2026","rel":"","context":"In "ECU Diagnostics"","block_context":{"text":"ECU Diagnostics","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/ecu-diagnostics\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/ECU-OSI-Layers.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/ECU-OSI-Layers.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/ECU-OSI-Layers.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/ECU-OSI-Layers.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/ECU-OSI-Layers.png?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":5192,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2019\/09\/20\/ecu-diagnostics-part-14-software-framework-mbe-py\/","url_meta":{"origin":4954,"position":2},"title":"ECU Diagnostics – part 14 : Software Framework mbe.py","author":"John Martin","date":"September 20, 2019","format":false,"excerpt":"This is hopefully a reasonably short post about the software framework I've developed to help read sensor data from the MBE 9A4 ECU. The software is written in Python 3 and is available here: Caterham-OBD. However, I'm going to talk about using one file only which is mbe.py.\u00a0 The idea\u2026","rel":"","context":"In "Caterham Blog"","block_context":{"text":"Caterham Blog","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4726,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2019\/08\/31\/ecu-diagnostics-part-1-introduction\/","url_meta":{"origin":4954,"position":3},"title":"ECU Diagnostics – part 1 : Introduction","author":"John Martin","date":"August 31, 2019","format":false,"excerpt":"So here we go for a marathon series of posts. I'll update this page with links to the completed posts as they come along... IntroductionECUs, OBD and CANTest SetupWireshark Patching and OBD-II ResultsThe Correlator Dead-EndReading MaterialECU Maps and MappingEasimap uses ISOTP (sort of)The Easimap Protocol TheoryDecoding EC2 FilesLogic Analyzer on\u2026","rel":"","context":"In "Caterham Blog"","block_context":{"text":"Caterham Blog","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4731,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2019\/09\/12\/ecu-diagnostics-part-7-ecu-maps-and-mapping\/","url_meta":{"origin":4954,"position":4},"title":"ECU Diagnostics – part 7 : ECU Maps and Mapping","author":"John Martin","date":"September 12, 2019","format":false,"excerpt":"People often talk about \"mapping\" a car. When they do that they're usually interested in one or more of three things: To increase its performance Improve its fuel economyImprove its drivability So what is mapping? In technical terms a map is a translation, or conversion, function that takes an input\u2026","rel":"","context":"In "Caterham Blog"","block_context":{"text":"Caterham Blog","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/08\/matplottest2-e1567080546893.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/08\/matplottest2-e1567080546893.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/08\/matplottest2-e1567080546893.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/08\/matplottest2-e1567080546893.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/08\/matplottest2-e1567080546893.png?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":5050,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2019\/09\/16\/ecu-diagnostics-part-11-logic-analyzer-on-the-can-bus\/","url_meta":{"origin":4954,"position":5},"title":"ECU Diagnostics – part 11 : Logic Analyzer on the CAN Bus","author":"John Martin","date":"September 16, 2019","format":false,"excerpt":"To test out my theories and the code I'd been writing, I needed a simple test and a way to make sure the code (and I) was doing what I thought it should be. The code part was easy, take the JSON files I'd created from the Easimap EC2 file\u2026","rel":"","context":"In "Caterham Blog"","block_context":{"text":"Caterham Blog","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/img_2013.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/img_2013.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/img_2013.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/img_2013.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/img_2013.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/img_2013.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]}],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/4954","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/comments?post=4954"}],"version-history":[{"count":1,"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/4954\/revisions"}],"predecessor-version":[{"id":10701,"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/4954\/revisions\/10701"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/media\/4955"}],"wp:attachment":[{"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/media?parent=4954"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/categories?post=4954"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/tags?post=4954"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}