![\"Cover](\"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":" Notes how The Car Hacker\u2019s Handbook helped frame the Caterham ECU diagnostics work, especially CAN bus, ISO-TP, UDS, and request-response protocol ideas.<\/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_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_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},"jetpack_post_was_ever_published":false},"categories":[51,20],"tags":[58,66,34,60,59],"class_list":["post-4954","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-caterham-blog","category-ecu-diagnostics","tag-can-bus","tag-caterham","tag-ecu-diagnostics","tag-mbe","tag-obd"],"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":"Introduces the three diagnostic protocols found on the Caterham MBE 9A4 ECU: MBE-Broadcast, OBD-II, and the MBE ISO-TP protocol used by Easimap.","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":"Maps the Caterham diagnostics stack onto the OSI model, from CAN bus hardware through MBE ISO-TP layers up to Python tooling and applications.","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":"Layered diagram mapping the MBE ECU protocol stack to OSI layers and CAN bus.","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":4726,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2019\/08\/31\/ecu-diagnostics-part-1-introduction\/","url_meta":{"origin":4954,"position":2},"title":"ECU Diagnostics – part 1 : Introduction","author":"John Martin","date":"August 31, 2019","format":false,"excerpt":"Introduction and index for the Caterham ECU diagnostics series, covering MBE ECU traffic, CAN bus, OBD-II, ISO-TP, test setup, protocol decoding, and supporting Python and Wireshark tooling.","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":5192,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2019\/09\/20\/ecu-diagnostics-part-14-software-framework-mbe-py\/","url_meta":{"origin":4954,"position":3},"title":"ECU Diagnostics – part 14 : Software Framework mbe.py","author":"John Martin","date":"September 20, 2019","format":false,"excerpt":"Introduces the Python mbe.py framework for sending requests to the Caterham MBE 9A4 ECU and formatting diagnostic responses into readable values.","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":6428,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2020\/07\/14\/lowflying-article-if-only-caterhams-could-talk-june-july-2020\/","url_meta":{"origin":4954,"position":4},"title":"Lowflying Article – If Only Caterhams Could Talk, June\/July 2020","author":"John Martin","date":"July 14, 2020","format":false,"excerpt":"Background post for the Lowflying article that adapted the Caterham ECU diagnostics work into a broader explanation of CAN bus and MBE diagnostic data.","rel":"","context":"In "Caterham & Lotus 7 Club"","block_context":{"text":"Caterham & Lotus 7 Club","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/caterham-lotus-7-club\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2020\/07\/If-Caterhams-Could-Talk-Covers-Blurred.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2020\/07\/If-Caterhams-Could-Talk-Covers-Blurred.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2020\/07\/If-Caterhams-Could-Talk-Covers-Blurred.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2020\/07\/If-Caterhams-Could-Talk-Covers-Blurred.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2020\/07\/If-Caterhams-Could-Talk-Covers-Blurred.png?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2020\/07\/If-Caterhams-Could-Talk-Covers-Blurred.png?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":5008,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2019\/09\/15\/ecu-diagnostics-part-8-easimap-uses-isotp\/","url_meta":{"origin":4954,"position":5},"title":"ECU Diagnostics – part 8 : Easimap uses ISOTP (sort of)","author":"John Martin","date":"September 15, 2019","format":false,"excerpt":"Examines Easimap CAN bus traffic and identifies ISO-TP-like message framing in the way the software talks to the Caterham MBE ECU.","rel":"","context":"In "Caterham Blog"","block_context":{"text":"Caterham Blog","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/"},"img":{"alt_text":"Diagram of CAN bus header bytes split into ID, DLC, and data fields.","src":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/CANBus-Header-Diagram.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/CANBus-Header-Diagram.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/CANBus-Header-Diagram.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/CANBus-Header-Diagram.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2019\/09\/CANBus-Header-Diagram.png?resize=1050%2C600&ssl=1 3x"},"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":3,"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/4954\/revisions"}],"predecessor-version":[{"id":11523,"href":"https:\/\/purplemeanie.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/4954\/revisions\/11523"}],"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}]}}