{"id":439718,"date":"2025-09-23T09:21:17","date_gmt":"2025-09-23T13:21:17","guid":{"rendered":"https:\/\/autosphere.ca\/?p=439718"},"modified":"2025-09-23T09:21:17","modified_gmt":"2025-09-23T13:21:17","slug":"la-mysterieuse-mazda6","status":"publish","type":"post","link":"https:\/\/autosphere.ca\/fr\/mecanique\/2025\/09\/23\/la-mysterieuse-mazda6\/","title":{"rendered":"La myst\u00e9rieuse Mazda6"},"content":{"rendered":"<p data-start=\"40\" data-end=\"241\">Vous est-il d\u00e9j\u00e0 arriv\u00e9 de vous lancer dans un diagnostic automobile que vous avez ensuite regrett\u00e9 d\u2019avoir accept\u00e9 ? Je plaisante\u2026 mais soyons honn\u00eates, cela nous est tous arriv\u00e9 un jour ou l\u2019autre.<\/p>\n<p data-start=\"243\" data-end=\"789\">Exemple concret : on m\u2019a demand\u00e9 de diagnostiquer une Mazda6 2019 qui ne d\u00e9marrait pas. La voiture avait \u00e9t\u00e9 impliqu\u00e9e dans un petit accident qui avait endommag\u00e9 l\u2019aile avant droite. Apr\u00e8s les r\u00e9parations de carrosserie, le v\u00e9hicule avait fonctionn\u00e9 un court moment avant de s\u2019arr\u00eater. Il avait ensuite \u00e9t\u00e9 envoy\u00e9 chez le concessionnaire, qui avait conclu qu\u2019il fallait remplacer le PCM (module de commande du moteur) ainsi que le faisceau \u00e9lectrique moteur. C\u2019est \u00e0 ce stade que j\u2019ai \u00e9t\u00e9 appel\u00e9 pour jeter un second coup d\u2019\u0153il.<\/p>\n<p data-start=\"243\" data-end=\"789\"><strong>Premi\u00e8res constatations<\/strong><\/p>\n<p data-start=\"821\" data-end=\"1138\">D\u00e8s le d\u00e9part, j\u2019ai remarqu\u00e9 un message li\u00e9 \u00e0 la s\u00e9curit\u00e9 et un t\u00e9moin \u00ab check engine \u00bb allum\u00e9s au tableau de bord. J\u2019ai branch\u00e9 un outil de diagnostic, mais aucune communication avec le PCM. Cela expliquait l\u2019absence de d\u00e9marrage. La premi\u00e8re \u00e9tape \u00e9vidente consistait donc \u00e0 r\u00e9tablir la communication avec le PCM.<\/p>\n<p data-start=\"1140\" data-end=\"1402\">J\u2019ai test\u00e9 les alimentations et masses du PCM ainsi que le CAN BUS entre le PCM et la prise OBD (DLC). Aucun d\u00e9faut relev\u00e9, conclusion : il fallait remplacer le PCM. Jusque-l\u00e0, tout allait bien. Apr\u00e8s r\u00e9ception du nouveau PCM, j\u2019ai tent\u00e9 une programmation.<\/p>\n<p data-start=\"1140\" data-end=\"1402\"><strong>Multiples probl\u00e8mes<\/strong><\/p>\n<p data-start=\"1430\" data-end=\"1921\">La programmation a \u00e9chou\u00e9, le logiciel n\u2019arrivant pas \u00e0 localiser le bon fichier. J\u2019ai appel\u00e9 l\u2019assistance Mazda et appris qu\u2019il existait plusieurs probl\u00e8mes connus de programmation sur cette plateforme. Le PCM a donc \u00e9t\u00e9 exp\u00e9di\u00e9 au support technique Mazda en Californie, o\u00f9 il a \u00e9t\u00e9 programm\u00e9 hors v\u00e9hicule, puis renvoy\u00e9. En th\u00e9orie, il devait \u00eatre \u00ab plug and play \u00bb. Malheureusement, en tentant de l\u2019associer \u00e0 l\u2019antid\u00e9marrage, j\u2019ai obtenu le m\u00eame message d\u2019erreur (fichier introuvable).<\/p>\n<p data-start=\"1923\" data-end=\"2121\">Avec mon outil de diagnostic, je pouvais lire le num\u00e9ro de s\u00e9rie (VIN) dans le PCM, mais pas les autres donn\u00e9es. Apr\u00e8s toutes ces \u00e9tapes, je me retrouvais encore avec un probl\u00e8me de communication.<\/p>\n<p data-start=\"1923\" data-end=\"2121\"><strong>Retour \u00e0 la case d\u00e9part<\/strong><\/p>\n<p data-start=\"2153\" data-end=\"2435\">Entre le diagnostic initial et toutes ces tentatives, j\u2019avais d\u00e9j\u00e0 pass\u00e9 environ un mois sur cette Mazda6. Dire que j\u2019\u00e9tais frustr\u00e9 est un euph\u00e9misme. Les tests habituels n\u2019indiquaient aucun d\u00e9faut, et un nouveau PCM n\u2019avait rien chang\u00e9. J\u2019ai donc d\u00e9cid\u00e9 de tout reprendre \u00e0 z\u00e9ro.<\/p>\n<p data-start=\"2437\" data-end=\"2931\">J\u2019ai rev\u00e9rifi\u00e9 rapidement le CAN BUS : OK. Ensuite, je suis retourn\u00e9 sur les alimentations et masses. En g\u00e9n\u00e9ral, j\u2019essaie d\u2019utiliser les sch\u00e9mas \u00e9lectriques d\u2019origine. Or, le syst\u00e8me d\u2019information que j\u2019utilisais ne proposait qu\u2019un sch\u00e9ma partiel pour l\u2019alimentation et la masse. J\u2019ai donc d\u00fb utiliser des sch\u00e9mas en couleur provenant de l\u2019apr\u00e8s-march\u00e9. D\u00e9j\u00e0 lors de mes premiers tests, cela m\u2019avait pos\u00e9 probl\u00e8me. J\u2019ai suivi le sch\u00e9ma pour rep\u00e9rer les bons circuits : tout semblait correct.<\/p>\n<p data-start=\"2437\" data-end=\"2931\"><strong>L\u2019alimentation ETC<\/strong><\/p>\n<p data-start=\"2958\" data-end=\"3418\">De retour \u00e0 la case d\u00e9part. J\u2019ai d\u00e9cid\u00e9 de reconsulter les sch\u00e9mas et de v\u00e9rifier tout ce qui touchait \u00e0 un circuit d\u2019alimentation. J\u2019ai fini par trouver un circuit identifi\u00e9 ETC Power (Electronic Throttle Control). Lors de mes premiers tests, j\u2019avais n\u00e9glig\u00e9 ce circuit \u00e0 cause de l\u2019intitul\u00e9. En retra\u00e7ant le circuit et en v\u00e9rifiant le brochage du connecteur, j\u2019ai d\u00e9couvert qu\u2019il s\u2019agissait en fait d\u2019une alimentation provenant du relais principal.<\/p>\n<p data-start=\"3420\" data-end=\"3849\">En mesurant, j\u2019ai trouv\u00e9 9 volts sur ce circuit. J\u2019ai alors branch\u00e9 un c\u00e2ble de d\u00e9rivation pour l\u2019alimenter correctement et voir si cela r\u00e9solvait le probl\u00e8me de communication. Avec ce fil de d\u00e9rivation, le PCM a enfin communiqu\u00e9, j\u2019ai pu r\u00e9aliser la r\u00e9initialisation du syst\u00e8me antid\u00e9marrage, et la Mazda a d\u00e9marr\u00e9 et tourn\u00e9 normalement. En r\u00e9parant le c\u00e2blage du circuit ETC Power, le probl\u00e8me a \u00e9t\u00e9 d\u00e9finitivement r\u00e9gl\u00e9.<\/p>\n<p data-start=\"3420\" data-end=\"3849\"><strong>Conclusion<\/strong><\/p>\n<p data-start=\"3868\" data-end=\"4106\">Il m\u2019a fallu six semaines de travail sur cette voiture pour d\u00e9couvrir que mon erreur d\u2019interpr\u00e9tation d\u2019un circuit d\u2019alimentation PCM \u00e9tiquet\u00e9 \u00ab ETC Power \u00bb \u00e9tait la v\u00e9ritable cause de la panne. Comme quoi, on n\u2019est jamais trop prudent\u2026<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vous est-il d\u00e9j\u00e0 arriv\u00e9 de vous lancer dans un diagnostic automobile que vous avez ensuite regrett\u00e9 d\u2019avoir accept\u00e9 ? Je plaisante\u2026 mais soyons honn\u00eates, cela nous est tous arriv\u00e9 un jour ou l\u2019autre. Exemple concret : on m\u2019a demand\u00e9 de diagnostiquer une Mazda6 2019 qui ne d\u00e9marrait pas. La voiture avait \u00e9t\u00e9 impliqu\u00e9e dans un&#8230;<\/p>\n","protected":false},"author":179,"featured_media":439716,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[820,632],"tags":[9478,9477,9480,9479],"class_list":["post-439718","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mecanique-editorial","category-mecanique","tag-diagnostic-auto","tag-entretien-voiture","tag-maintenance-automobile","tag-reparation-mecanique"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.7 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>La myst\u00e9rieuse Mazda6 - Autosphere<\/title>\n<meta name=\"description\" content=\"Vous est-il d\u00e9j\u00e0 arriv\u00e9 de vous lancer dans un diagnostic automobile que vous avez ensuite regrett\u00e9 d\u2019avoir accept\u00e9 ? 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