{"id":528169,"date":"2026-07-17T01:50:27","date_gmt":"2026-07-17T05:50:27","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=528169"},"modified":"2026-07-17T01:50:27","modified_gmt":"2026-07-17T05:50:27","slug":"1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/","title":{"rendered":"1991 Mitsubishi Mighty Max PCM Replacement &#038; ECM Relearn Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>1991 Mitsubishi Mighty Max PCM Replacement &amp; ECM Relearn Guide<\/h1>\n<p class=\"hero-subtitle\">The Powertrain Control Module in your 1991 Mighty Max is the central computer managing fuel delivery, ignition timing, and emissions systems. When this unit fails, the engine may run poorly or not start at all, leaving you stranded.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>The 1991 Mighty Max uses a single powertrain control module handling both engine and transmission functions<\/li>\n<li>Module replacement requires approximately 0.7 hours of labor for removal and installation<\/li>\n<li>A relearn procedure is necessary after installation to allow the new module to adapt to your vehicle<\/li>\n<li>Flagship One provides VIN-programmed replacement units ready for install<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>If your 1991 Mitsubishi Mighty Max with the 2.4L engine is experiencing starting problems, stalling, or poor running conditions, the Powertrain Control Module may be the culprit. This vehicle predates OBD-II standardization, meaning diagnostic capabilities are more limited than modern vehicles, but the PCM remains the brain of the engine management system. Understanding how this computer operates, where it is located, and what the replacement process involves can save you significant diagnostic time and expense. This guide walks you through everything you need to know about servicing the PCM or Engine Control Module in your Mighty Max, from recognizing failure symptoms to completing the installation and programming procedures. Whether you are a do-it-yourself mechanic or discussing options with a professional, the information here helps you make informed decisions about your vehicle is repair.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 1991 Mitsubishi Mighty Max Pickup<\/h2>\n<p>The Powertrain Control Module in your 1991 Mitsubishi Mighty Max serves as the primary computer responsible for managing the engine and transmission operation. This unit receives input from various sensors throughout the engine bay, including those monitoring airflow, coolant temperature, throttle position, and crankshaft position. Based on this sensor data, the PCM calculates the optimal fuel injector pulse width and ignition timing to deliver smooth operation and reasonable fuel efficiency. Unlike later OBD-II compliant vehicles, this pre-1996 model uses a less sophisticated diagnostic system, meaning the PCM must be accessed directly for many diagnostic procedures. The module also controls the automatic transmission shift points on models so equipped, making its function critical for driveability. When the internal processor or circuitry within the PCM degrades from age, heat cycles, or electrical stress, the module may send incorrect commands to the fuel injectors or ignition system, resulting in rough idle, no-start conditions, or stalling. Replacement engine computers for the Mighty Max are available from specialty suppliers who program these units with vehicle-specific calibration data before shipping.<\/p>\n<p>Flagship One keeps <a href=\"https:\/\/www.fs1inc.com\/chrysler-dodge-plymouth\/mitsubishi-pcm-ecm-ecu-engine-computer\/mighty-max-pickup-engine-computers.html\">Mitsubishi Mighty Max Pickup replacement engine computers<\/a> in stock for exactly this failure pattern.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Where the PCM Is Located and What Replacement Involves<\/h2>\n<p>The Powertrain Control Module on the 1991 Mighty Max is typically located inside the vehicle is cabin, often beneath the passenger side dashboard or behind the center console, depending on the exact body configuration. Accessing the module requires removing interior trim panels and potentially the glove box assembly. The replacement procedure involves disconnecting the battery ground cable first, then unplugging the main harness connector from the PCM, removing the mounting screws or bolts, and extracting the old unit. Installation reverses these steps, ensuring all connectors are fully seated and the mounting hardware is secure. The book time for PCM R&amp;R is 0.7 hours, though actual time may vary based on the difficulty of accessing your particular vehicle is configuration and any additional components that must be moved for clear access. After installation, the PCM must be secured properly and all trim pieces reinstalled before reconnecting the battery.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:18px 0;font-size:15px\">\n<tr>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Operation<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Configuration<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Book Time<\/th>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module R&amp;R<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.7 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module Relearn<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.5 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module Relearn<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.5 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module R&amp;R<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.7 hr<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Programming Requirements After Replacement<\/h2>\n<p>After replacing the PCM in your 1991 Mitsubishi Mighty Max, the factory service procedure requires performing a relearn procedure so the new module can establish communication with your vehicle is sensors and learn appropriate operating parameters. The powertrain control module relearn process takes approximately 0.5 hours to complete using a compatible scan tool or factory diagnostic equipment. Additionally, if the vehicle is equipped with a separate Engine Control Module, a distinct ECM relearn procedure requiring another 0.5 hours may be necessary to ensure proper fuel delivery calibration. These procedures synchronize the new computer with your specific engine is characteristics and transmission behavior. When you purchase a VIN-programmed replacement unit from Flagship One, the module arrives pre-configured with your vehicle is specific calibration data, eliminating the need to manually program the unit yourself. Your installer or repair facility will still need to perform the post-install relearn procedure to ensure the new module integrates properly with your vehicle is systems.<\/p>\n<p>Every <a href=\"https:\/\/www.fs1inc.com\/1991-mitsubishi-mighty-max-pickup-2-4l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\">VIN-programmed replacement unit<\/a> from Flagship One arrives with these steps already completed.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Protecting the PCM in Your 1991 Mitsubishi Mighty Max Pickup<\/h2>\n<ul style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\">Maintain proper charging system voltage by regularly testing the alternator output and battery condition to prevent electrical stress on the PCM<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Ensure all ground connections between the engine and chassis remain clean and tight, as poor grounding can cause voltage spikes damaging to the module<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump-starting the vehicle incorrectly, as reverse polarity or excessive voltage during starting can damage sensitive PCM circuits<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address any check engine lights or running problems promptly rather than driving with known issues that may further stress the module<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Keep PCM connectors and wiring harness seals intact by inspecting boot seals periodically and repairing any damage that allows moisture intrusion<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Use caution when using aftermarket electrical accessories or performing welding on the vehicle, as voltage surges can travel through the system and damage the PCM<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<h2>Frequently Asked Questions<\/h2>\n<h3>Will any used PCM from a 1991 Mighty Max work in my vehicle?<\/h3>\n<p>No, the PCM contains vehicle-specific calibration data matched to your specific engine and transmission combination. A unit from a different vehicle likely will not communicate properly with your sensors and may cause running problems.<\/p>\n<h3>Can I replace the PCM myself on my 1991 Mighty Max?<\/h3>\n<p>If you have basic mechanical skills and can follow diagnostic procedures, the R&amp;R process is straightforward for experienced DIYers. However, the post-install relearn procedure typically requires professional diagnostic equipment.<\/p>\n<h3>How do I know if my Mighty Max has a PCM or separate ECM problem?<\/h3>\n<p>Since this vehicle predates standardized diagnostics, a thorough process of elimination is required. Testing sensor inputs and verifying proper ground connections helps isolate whether the problem lies with the computer or elsewhere in the system.<\/p>\n<h3>What causes PCM failure in these early Mitsubishi trucks?<\/h3>\n<p>The primary culprits are age-related deterioration of internal capacitors and circuitry, repeated exposure to heat cycles from the engine bay, and electrical stress from charging system problems or jump-start events.<\/p>\n<h3>Is a refurbished PCM better than a used unit from a salvage yard?<\/h3>\n<p>Refurbished units typically undergo testing and repair of known failure points, whereas salvage yard units may have the same hidden defects that caused the original failure. A refurbished unit often includes a warranty covering similar failure modes.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>When your 1991 Mitsubishi Mighty Max requires PCM replacement, you have two primary paths forward. Repairing the existing module is sometimes possible through specialized electronics services, though this may take longer and success is not guaranteed. The more common approach is obtaining a replacement unit that arrives ready for installation. Flagship One specializes in providing engine computers programmed with your specific vehicle is VIN and calibration data, meaning less time in the shop and more confidence in the repair. Consider your budget, timeline, and comfort level with the repair process when deciding which option best suits your needs.<\/p>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/1991-mitsubishi-mighty-max-pickup-2-4l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 1991 Mitsubishi Mighty Max Pickup<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/chrysler-dodge-plymouth\/mitsubishi-pcm-ecm-ecu-engine-computer\/mighty-max-pickup-engine-computers.html\">Mitsubishi Mighty Max Pickup module lineup<\/a> covers other engine configurations as well.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Final Thoughts<\/h2>\n<p>The 1991 Mitsubishi Mighty Max relies on its Powertrain Control Module for reliable operation, and recognizing failure symptoms early can prevent being stranded. Whether you tackle the replacement yourself or leave it to a professional, understanding the process helps you make informed decisions. For a programmed replacement unit specifically configured for your Mighty Max, explore what Flagship One offers to get your truck back on the road.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Diagnose and replace the PCM in your 1991 Mitsubishi Mighty Max. Learn about module location, labor times, programming requirements, and common failure symptoms.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[258,295],"tags":[348,1384,296],"class_list":["post-528169","post","type-post","status-publish","format-standard","hentry","category-car","category-mitsubishi","tag-348","tag-mighty-max-pickup","tag-mitsubishi"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>1991 Mitsubishi Mighty Max PCM Replacement &amp; ECM Relearn Guide - Flagship One Blog<\/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.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1991 Mitsubishi Mighty Max PCM Replacement &amp; ECM Relearn Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Diagnose and replace the PCM in your 1991 Mitsubishi Mighty Max. Learn about module location, labor times, programming requirements, and common failure symptoms.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/\" \/>\n<meta property=\"og:site_name\" content=\"Flagship One Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/flagshipone\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/flagshipone\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-17T05:50:27+00:00\" \/>\n<meta name=\"author\" content=\"FlagshipOne\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@theflagshipone\" \/>\n<meta name=\"twitter:site\" content=\"@theflagshipone\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"FlagshipOne\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\\\/\"},\"author\":{\"name\":\"FlagshipOne\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\"},\"headline\":\"1991 Mitsubishi Mighty Max PCM Replacement &#038; ECM Relearn Guide\",\"datePublished\":\"2026-07-17T05:50:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\\\/\"},\"wordCount\":1375,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\"},\"keywords\":[\"1991\",\"Mighty Max Pickup\",\"Mitsubishi\"],\"articleSection\":[\"Car\",\"Mitsubishi\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\\\/\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\\\/\",\"name\":\"1991 Mitsubishi Mighty Max PCM Replacement & ECM Relearn Guide - Flagship One Blog\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#website\"},\"datePublished\":\"2026-07-17T05:50:27+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"1991 Mitsubishi Mighty Max PCM Replacement &#038; ECM Relearn Guide\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\",\"name\":\"Flagship One Blog\",\"description\":\"Flagship One Inc. OEM Engine Computers  Control Modules\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\",\"name\":\"Flagship One, Inc.\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/06\\\/web-lg-fs1-logo.png\",\"contentUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/06\\\/web-lg-fs1-logo.png\",\"width\":1341,\"height\":1098,\"caption\":\"Flagship One, Inc.\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/flagshipone\",\"https:\\\/\\\/x.com\\\/theflagshipone\",\"https:\\\/\\\/www.instagram.com\\\/flagship_one\",\"https:\\\/\\\/www.youtube.com\\\/channel\\\/UC0oyKphffBM2qkJ-gKPmMXw\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\",\"name\":\"FlagshipOne\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"caption\":\"FlagshipOne\"},\"description\":\"The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules.\",\"sameAs\":[\"https:\\\/\\\/www.fs1inc.com\\\/\",\"https:\\\/\\\/www.facebook.com\\\/flagshipone\\\/\",\"https:\\\/\\\/www.instagram.com\\\/flagship_one\\\/\",\"https:\\\/\\\/www.linkedin.com\\\/company\\\/fs1inc\"],\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/author\\\/flagship1inc\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"1991 Mitsubishi Mighty Max PCM Replacement & ECM Relearn Guide - Flagship One Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/","og_locale":"en_US","og_type":"article","og_title":"1991 Mitsubishi Mighty Max PCM Replacement & ECM Relearn Guide - Flagship One Blog","og_description":"Diagnose and replace the PCM in your 1991 Mitsubishi Mighty Max. Learn about module location, labor times, programming requirements, and common failure symptoms.","og_url":"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/","og_site_name":"Flagship One Blog","article_publisher":"https:\/\/www.facebook.com\/flagshipone","article_author":"https:\/\/www.facebook.com\/flagshipone\/","article_published_time":"2026-07-17T05:50:27+00:00","author":"FlagshipOne","twitter_card":"summary_large_image","twitter_creator":"@theflagshipone","twitter_site":"@theflagshipone","twitter_misc":{"Written by":"FlagshipOne","Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/#article","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/"},"author":{"name":"FlagshipOne","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/person\/a3cf463514bd03eb7656953ef8f75700"},"headline":"1991 Mitsubishi Mighty Max PCM Replacement &#038; ECM Relearn Guide","datePublished":"2026-07-17T05:50:27+00:00","mainEntityOfPage":{"@id":"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/"},"wordCount":1375,"commentCount":0,"publisher":{"@id":"https:\/\/www.fs1inc.com\/blog\/#organization"},"keywords":["1991","Mighty Max Pickup","Mitsubishi"],"articleSection":["Car","Mitsubishi"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/","url":"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/","name":"1991 Mitsubishi Mighty Max PCM Replacement & ECM Relearn Guide - Flagship One Blog","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/#website"},"datePublished":"2026-07-17T05:50:27+00:00","breadcrumb":{"@id":"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.fs1inc.com\/blog\/1991-mitsubishi-mighty-max-pickup-pcm-replacement-guide\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.fs1inc.com\/blog\/"},{"@type":"ListItem","position":2,"name":"1991 Mitsubishi Mighty Max PCM Replacement &#038; ECM Relearn Guide"}]},{"@type":"WebSite","@id":"https:\/\/www.fs1inc.com\/blog\/#website","url":"https:\/\/www.fs1inc.com\/blog\/","name":"Flagship One Blog","description":"Flagship One Inc. OEM Engine Computers  Control Modules","publisher":{"@id":"https:\/\/www.fs1inc.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.fs1inc.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.fs1inc.com\/blog\/#organization","name":"Flagship One, Inc.","url":"https:\/\/www.fs1inc.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2019\/06\/web-lg-fs1-logo.png","contentUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2019\/06\/web-lg-fs1-logo.png","width":1341,"height":1098,"caption":"Flagship One, Inc."},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/flagshipone","https:\/\/x.com\/theflagshipone","https:\/\/www.instagram.com\/flagship_one","https:\/\/www.youtube.com\/channel\/UC0oyKphffBM2qkJ-gKPmMXw"]},{"@type":"Person","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/person\/a3cf463514bd03eb7656953ef8f75700","name":"FlagshipOne","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","caption":"FlagshipOne"},"description":"The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules.","sameAs":["https:\/\/www.fs1inc.com\/","https:\/\/www.facebook.com\/flagshipone\/","https:\/\/www.instagram.com\/flagship_one\/","https:\/\/www.linkedin.com\/company\/fs1inc"],"url":"https:\/\/www.fs1inc.com\/blog\/author\/flagship1inc\/"}]}},"_links":{"self":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/528169","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/comments?post=528169"}],"version-history":[{"count":1,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/528169\/revisions"}],"predecessor-version":[{"id":528170,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/528169\/revisions\/528170"}],"wp:attachment":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/media?parent=528169"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/categories?post=528169"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/tags?post=528169"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}