{"id":3694,"date":"2025-10-17T10:35:32","date_gmt":"2025-10-17T08:35:32","guid":{"rendered":"https:\/\/diagzone.org\/?p=3694"},"modified":"2025-10-17T10:35:34","modified_gmt":"2025-10-17T08:35:34","slug":"sae-j1850-pwm-the-foundation-of-communication-in-older-vehicles","status":"publish","type":"post","link":"https:\/\/diagzone.org\/fr\/sae-j1850-pwm-the-foundation-of-communication-in-older-vehicles\/","title":{"rendered":"SAE J1850 PWM : La base de la communication dans les v\u00e9hicules anciens"},"content":{"rendered":"

SAE J1850 PWM (Pulse Width Modulation) est l\u2019un des premiers standards de communication des syst\u00e8mes OBD-II. Ce protocole a \u00e9t\u00e9 d\u00e9velopp\u00e9 par la SAE (Society of Automotive Engineers) dans le but de permettre un \u00e9change de donn\u00e9es rapide et fiable entre les modules \u00e9lectroniques des v\u00e9hicules.<\/p>\n\n\n\n

Comment fonctionne le SAE J1850 PWM ?<\/strong><\/p>\n\n\n\n

Le protocole utilise la modulation de largeur d\u2019impulsion (PWM) pour transmettre des signaux num\u00e9riques entre les unit\u00e9s de commande \u00e9lectroniques (ECU). La vitesse de communication est de 41,6 kb\/s, ce qui \u00e9tait suffisant \u00e0 l\u2019\u00e9poque pour les fonctions de diagnostic et l\u2019\u00e9change de donn\u00e9es de base concernant le moteur, les \u00e9missions et les syst\u00e8mes de s\u00e9curit\u00e9.<\/p>\n\n\n\n

Adaptateurs OBD-II Launch prenant en charge le protocole :<\/strong><\/p>\n\n\n\n

DBScar I, DBScar II, DBScar III, DBScar IV, DBScar V, DBScar VII<\/p>\n\n\n\n

Appareils ThinkDiag prenant en charge le protocole :<\/strong><\/p>\n\n\n\n

ThinkDiag, ThinkDiag 2<\/p>\n\n\n\n

Appareils Ediag prenant en charge le protocole :<\/strong><\/p>\n\n\n\n

Ediag YA-101, Ediag YA-201, Ediag Plus, Ediag Elite<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Types de v\u00e9hicules et marques pris en charge par le protocole :<\/strong><\/p>\n\n\n\n

V\u00e9hicules particuliers de constructeurs am\u00e9ricains, principalement Ford, Lincoln, Mercury ; mod\u00e8les de 1996 \u00e0 2004.<\/p>\n\n\n\n

Avantages du protocole SAE J1850 PWM<\/strong><\/p>\n\n\n\n

    \n
  • Transmission de donn\u00e9es fiable et stable dans les v\u00e9hicules \u00e9quip\u00e9s de plusieurs ECU<\/li>\n\n\n\n
  • Mise en \u0153uvre simple et bonne r\u00e9sistance aux interf\u00e9rences \u00e9lectromagn\u00e9tiques<\/li>\n\n\n\n
  • Standardis\u00e9 pour l\u2019OBD-II, permettant des diagnostics de base sans logiciel sp\u00e9cialis\u00e9<\/li>\n\n\n\n
  • Utile pour l\u2019apprentissage et les tests, car il illustre clairement la logique des anciens protocoles de communication<\/li>\n<\/ul>\n\n\n\n

    Inconv\u00e9nients et limitations<\/strong><\/p>\n\n\n\n

      \n
    • Vitesse de transmission limit\u00e9e par rapport aux syst\u00e8mes CAN modernes<\/li>\n\n\n\n
    • Ne prend pas en charge les fonctions avanc\u00e9es telles que la diffusion de donn\u00e9es en temps r\u00e9el<\/li>\n\n\n\n
    • Norme obsol\u00e8te, remplac\u00e9e par des protocoles tels que l\u2019ISO 15765 (CAN) et l\u2019ISO 9141-2<\/li>\n\n\n\n
    • Disponibilit\u00e9 r\u00e9duite des v\u00e9hicules et modules compatibles dans les mod\u00e8les plus r\u00e9cents<\/li>\n<\/ul>\n\n\n\n

      O\u00f9 est utilis\u00e9 le SAE J1850 PWM ?<\/strong><\/p>\n\n\n\n

      Ce protocole est utilis\u00e9 dans la communication OBD-II pour la lecture et l\u2019effacement des codes d\u00e9faut DTC, la surveillance des valeurs des capteurs et le suivi du fonctionnement du moteur. Il est le plus souvent appliqu\u00e9 aux mod\u00e8les de v\u00e9hicules plus anciens qui utilisent encore des modules de commande \u00e9lectroniques traditionnels connect\u00e9s via le syst\u00e8me PWM.<\/p>\n\n\n\n

      Conclusion<\/strong><\/p>\n\n\n\n

      Le SAE J1850 PWM joue encore un r\u00f4le important dans le diagnostic automobile, en particulier pour les v\u00e9hicules plus anciens. Bien que les protocoles modernes le remplacent progressivement, la compr\u00e9hension du SAE J1850 PWM reste essentielle pour tout diagnosticien souhaitant travailler efficacement avec l\u2019ensemble des syst\u00e8mes OBD-II.<\/p>","protected":false},"excerpt":{"rendered":"

      SAE J1850 PWM (Pulse Width Modulation) is one of the early standards for communication in OBD-II systems. This protocol was developed by SAE (Society of Automotive Engineers) with the goal of enabling fast and reliable data exchange between electronic modules within vehicles. How Does SAE J1850 PWM Work? The protocol uses pulse width modulation (PWM)…<\/p>","protected":false},"author":1,"featured_media":3696,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"SAEJ850 PWM: foundation of communication in older vehicles","_seopress_titles_desc":"SAE J1850 PWM still plays an important role in automotive diagnostics, particularly for older vehicles","_seopress_robots_index":"","inline_featured_image":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_themeisle_gutenberg_block_has_review":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"iawp_total_views":86,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3694","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"taxonomy_info":{"category":[{"value":1,"label":"Uncategorized"}]},"featured_image_src_large":["https:\/\/diagzone.org\/wp-content\/uploads\/2025\/10\/SAE-J1850-PWM.jpg",600,600,false],"author_info":{"display_name":"diagzone","author_link":"https:\/\/diagzone.org\/fr\/author\/xpro5\/"},"comment_info":0,"category_info":[{"term_id":1,"name":"Uncategorized","slug":"uncategorized","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"","parent":0,"count":33,"filter":"raw","cat_ID":1,"category_count":33,"category_description":"","cat_name":"Uncategorized","category_nicename":"uncategorized","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/posts\/3694","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/comments?post=3694"}],"version-history":[{"count":1,"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/posts\/3694\/revisions"}],"predecessor-version":[{"id":3700,"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/posts\/3694\/revisions\/3700"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/media\/3696"}],"wp:attachment":[{"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/media?parent=3694"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/categories?post=3694"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/diagzone.org\/fr\/wp-json\/wp\/v2\/tags?post=3694"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}