{"id":2199,"date":"2025-08-16T15:55:44","date_gmt":"2025-08-16T15:55:44","guid":{"rendered":"https:\/\/www.dovinta.ca\/?post_type=truck_diagnost_cases&#038;p=2199"},"modified":"2025-08-31T17:54:33","modified_gmt":"2025-08-31T17:54:33","slug":"truck-diagnostics-case-1","status":"publish","type":"truck_diagnost_cases","link":"https:\/\/www.dovinta.ca\/fr\/truck_diagnost_cases\/truck-diagnostics-case-1\/","title":{"rendered":"D\u00e9rogation du ventilateur \u2013 Western Star 4900"},"content":{"rendered":"<p>Nous avons r\u00e9cemment travaill\u00e9 sur un Western Star 4900 qui avait \u00e9t\u00e9 converti d\u2019un moteur MBE 4000 \u00e0 un Detroit Diesel Series 60 \u2014 une am\u00e9lioration solide, mais qui s\u2019accompagnait de plusieurs modifications \u00e9lectriques.<\/p>\n\n\n\n<p class=\"translation-block\">Apr\u00e8s la conversion, tout fonctionnait bien, sauf une chose : l\u2019<strong>interrupteur de d\u00e9rogation du ventilateur<\/strong> dans la cabine ne faisait rien. Aucun d\u00e9clenchement du ventilateur, aucune r\u00e9ponse de l\u2019ECU.<\/p>\n\n\n\n<p class=\"translation-block\">Nous avions d\u00e9j\u00e0 reconfigur\u00e9 tout le faisceau de c\u00e2bles moteur pour le Detroit, mais la logique de commande du ventilateur ne fonctionnait pas correctement. La raison ? Sur le Series 60, <strong>la d\u00e9rogation du ventilateur est une fonction d\u2019entr\u00e9e\/sortie (I\/O) d\u00e9finie dans la configuration de l\u2019ECM<\/strong>, et le simple fait de brancher les fils ne signifie pas que l\u2019ECM sait quoi en faire.<\/p>\n\n\n\n<p>La solution a n\u00e9cessit\u00e9 de reprogrammer l\u2019ECM pour qu\u2019il accepte l\u2019entr\u00e9e de d\u00e9rogation et attribue une sortie appropri\u00e9e \u00e0 l\u2019\u00e9lectrovanne du ventilateur. Une fois ces param\u00e8tres correctement configur\u00e9s \u00e0 l\u2019aide de DRS (ou DDRS pour les ECU DDEC IV+), l\u2019interrupteur manuel du ventilateur a commenc\u00e9 \u00e0 fonctionner exactement comme pr\u00e9vu \u2014 sans fils de d\u00e9rivation, sans approximations, simplement une int\u00e9gration propre, comme \u00e0 l\u2019origine.<\/p>\n\n\n\n<p class=\"translation-block\">Quand vous remplacez un moteur, ce n\u2019est pas seulement un travail m\u00e9canique \u2014 il faut aussi mettre \u00e0 jour le <strong>cerveau<\/strong> du syst\u00e8me. Le rec\u00e2blage n\u2019est que la moiti\u00e9 du travail. Le reste, c\u2019est une configuration intelligente.<\/p>\n\n\n\n\n\n\n\n<p><\/p>","protected":false},"featured_media":2126,"template":"","class_list":["post-2199","truck_diagnost_cases","type-truck_diagnost_cases","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Western Star 4900 Fan override - Dovinta<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dovinta.ca\/fr\/truck_diagnost_cases\/truck-diagnostics-case-1\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Western Star 4900 Fan override - Dovinta\" \/>\n<meta property=\"og:description\" content=\"We recently worked on a Western Star 4900 that had been converted from an MBE 4000 to a Detroit Diesel Series 60 \u2014 a solid upgrade, but one that came with its share of electrical mods. 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After the swap, everything ran fine, except one of the things: the fan override switch in the cab didn\u2019t&hellip;","_links":{"self":[{"href":"https:\/\/www.dovinta.ca\/fr\/wp-json\/wp\/v2\/truck_diagnost_cases\/2199","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dovinta.ca\/fr\/wp-json\/wp\/v2\/truck_diagnost_cases"}],"about":[{"href":"https:\/\/www.dovinta.ca\/fr\/wp-json\/wp\/v2\/types\/truck_diagnost_cases"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dovinta.ca\/fr\/wp-json\/wp\/v2\/media\/2126"}],"wp:attachment":[{"href":"https:\/\/www.dovinta.ca\/fr\/wp-json\/wp\/v2\/media?parent=2199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}