{"id":456,"date":"2012-03-20T12:43:16","date_gmt":"2012-03-20T12:43:16","guid":{"rendered":"http:\/\/autotechdiagnostics.com\/?p=456"},"modified":"2023-06-06T13:11:46","modified_gmt":"2023-06-06T13:11:46","slug":"bmw-e39-m5-dual-mass-air-flow-maf-testing-specifications","status":"publish","type":"post","link":"https:\/\/autotechdiagnostics.com\/?p=456","title":{"rendered":"BMW E39 M5 Dual Mass Air Flow MAF Testing Specifications"},"content":{"rendered":"<p>Use the following information as an aide when testing BMW E39 dual MAF sensors. Keep in mind, a problem with mechanical engine components can affect MAF readings and besure you have a solid base engine before condeming parts.<\/p>\n<p><strong>KOEO (Key On &#8211; Engine OFF)<\/strong>taken at sensor back probing with DVOM<br \/>\nB1 AFM 1.02 Volts<br \/>\nB2 AFM 1.02 Volts<br \/>\n<strong>Using scan tool<\/strong>Both AFM sensors read 0.9 Volt on GT1 under maf data stream.<\/p>\n<p><strong>Hot, engine running at idle<\/strong> taken at sensor back probing with DVOM<br \/>\nB1 AFM 1.30 Volts<br \/>\nB2 AFM 1.29 Volts<br \/>\n<strong>Using scan tool<\/strong>Both AFM sensors read 1.0 Volt on GT1 under maf data stream.<\/p>\n<p><strong>2500 RPM <\/strong>taken at sensor back probing with DVOM<br \/>\nB1 AFM 1.85 Volts<br \/>\nB2 AFM 1.75 Volts<br \/>\n<strong>Using scan tool<\/strong>Both AFM sensors read 1.5 Volt on GT1 under AFM data stream<\/p>\n<p><a href=\"\" title=\"e39maf1 by Automotive Diagnostic Resources, on Flickr\"><img decoding=\"async\" loading=\"lazy\" src=\"http:\/\/farm8.staticflickr.com\/7053\/6853455432_d266dec3a9.jpg\" width=\"480\" height=\"266\" alt=\"e39maf1\"><\/a><\/p>\n<p>IAT sensor not used on bank 2 AFM. However sensors are interchangeable.<\/p>\n<p>Testing using a labscope. In Park or<br \/>\nNeutral, parking brake on.<br \/>\nSnap throttle to reach max voltage output.<br \/>\n(scope pattern shows a dual trace of both<br \/>\nAFM\u2019s.<br \/>\n<a href=\"\" title=\"e39maf2 by Automotive Diagnostic Resources, on Flickr\"><img decoding=\"async\" loading=\"lazy\" src=\"http:\/\/farm8.staticflickr.com\/7095\/6999578461_ffcbf62fb9.jpg\" width=\"500\" height=\"360\" alt=\"e39maf2\"><\/a><br \/>\nThe sensors should be within 0.1 volts of each other.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Use the following information as an aide when testing BMW E39 dual MAF sensors. Keep in mind, a problem with mechanical engine components can affect MAF readings and besure you have a solid base engine before condeming parts. KOEO (Key &hellip; <a href=\"https:\/\/autotechdiagnostics.com\/?p=456\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":474,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,219],"tags":[226,155,227,228,229,230,221,225,200,222,223,110,224],"_links":{"self":[{"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=\/wp\/v2\/posts\/456"}],"collection":[{"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=456"}],"version-history":[{"count":22,"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=\/wp\/v2\/posts\/456\/revisions"}],"predecessor-version":[{"id":718,"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=\/wp\/v2\/posts\/456\/revisions\/718"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=\/wp\/v2\/media\/474"}],"wp:attachment":[{"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=456"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=456"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/autotechdiagnostics.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=456"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}