{"id":16370,"date":"2020-09-18T06:39:39","date_gmt":"2020-09-18T13:39:39","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=16370"},"modified":"2026-04-14T06:24:38","modified_gmt":"2026-04-14T13:24:38","slug":"how-to-test-an-air-suspension-compressor","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/how-to-test-an-air-suspension-compressor\/","title":{"rendered":"How to Test an Air Suspension Compressor"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column16370_2db8a0-9d > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column16370_2db8a0-9d > .kt-inside-inner-col,.kadence-column16370_2db8a0-9d > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column16370_2db8a0-9d > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16370_2db8a0-9d > .kt-inside-inner-col{flex-direction:column;}.kadence-column16370_2db8a0-9d > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16370_2db8a0-9d > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16370_2db8a0-9d{position:relative;}@media all and (max-width: 1024px){.kadence-column16370_2db8a0-9d > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16370_2db8a0-9d > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16370_2db8a0-9d inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-6430a2  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-28a0ec\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading16370_a95a08-43, .wp-block-kadence-advancedheading.kt-adv-heading16370_a95a08-43[data-kb-block=\"kb-adv-heading16370_a95a08-43\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading16370_a95a08-43 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading16370_a95a08-43[data-kb-block=\"kb-adv-heading16370_a95a08-43\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading16370_a95a08-43 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading16370_a95a08-43[data-kb-block=\"kb-adv-heading16370_a95a08-43\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading16370_a95a08-43 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading16370_a95a08-43\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The air suspension compressor often fails because a leak causes it to overwork until it burns out.<\/li>\n\n\n\n<li>An air suspension compressor test starts by listening for the part to turn on to see if it still works.<\/li>\n\n\n\n<li>If the air suspension compressor doesn&rsquo;t make noise, test the inoperative part with a digital multimeter to determine the exact issue and appropriate solution.<\/li>\n\n\n\n<li>You can test the compressor relay with a fused jumper wire, but ensure you follow safety precautions.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>There are a variety of electronically-controlled suspensions in use today. Many of these systems use air springs and an air compressor to raise and lower the vehicle. A control module (computer) and sensors govern the compressor.&nbsp;<\/p>\n\n\n\n<p>It&rsquo;s not uncommon for an air suspension compressor to fail. Often, the failure occurs due to a leak somewhere in the system that overworks the compressor and causes it to burn out.&nbsp;<\/p>\n\n\n\n<p>If your compressor isn&rsquo;t working, it&rsquo;s smart to perform some diagnostic work to ensure the compressor (rather than a circuit issue) is to blame. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Test an Air Suspension Compressor <\/h2>\n\n\n\n<p>The steps for testing an air suspension compressor will vary depending on the vehicle and the system design. The information below is generic and for entertainment and educational purposes only. Be sure to follow the factory repair information for your specific application.<\/p>\n\n\n\n<p>You can learn more about <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"accessing quality repair information in this article\">accessing quality repair information in this article<\/a>.&nbsp;<\/p>\n\n\n\n<p>With that in mind, let&rsquo;s discuss the steps of a typical air compressor troubleshooting strategy.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Verify That the Compressor is Inoperative&nbsp;<\/h3>\n\n\n\n<p>First, verify that the compressor is indeed inoperative. Usually, you can do this by listening for it to turn on. Depending on the vehicle and the system design, you may need to perform some type of action, such as adding weight to the rear of the vehicle, to engage the compressor.&nbsp;<\/p>\n\n\n\n<p>If you don&rsquo;t hear the compressor running when it should, either the compressor is faulty or there&rsquo;s a problem somewhere in its control circuit.&nbsp; <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"721\" height=\"722\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-1.jpg\" alt=\"air suspension compressor wiring diagram\" class=\"wp-image-16374\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-1.jpg 721w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-1-300x300.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-1-75x75.jpg 75w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-1-600x600.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-1-150x150.jpg 150w\" sizes=\"(max-width: 721px) 100vw, 721px\"><figcaption class=\"wp-element-caption\"><em>A typical air suspension compressor wiring diagram <\/em><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Check that the Compressor Has Power and Ground&nbsp;<\/h3>\n\n\n\n<p>Once you&rsquo;ve verified that the compressor isn&rsquo;t working, you need to find out why. Is the compressor faulty or is there a circuit issue preventing it from operating?&nbsp;<\/p>\n\n\n\n<p>To find out, you&rsquo;ll need a digital multimeter (DMM) and access to repair information that includes the factory wiring diagrams. Then, you can perform the steps listed below.&nbsp;<\/p>\n\n\n\n<p><strong><em>Tip: <\/em><\/strong><em>You can also test the compressor by jumping it with jumper wires or a Power Probe. <\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Put on your safety glasses.&nbsp;<\/li>\n\n\n\n<li>Consult a repair manual to determine which terminals are which on the compressor electrical connector. <\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"738\" height=\"722\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-2-1.jpg\" alt=\"air compressor diagram\" class=\"wp-image-16376\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-2-1.jpg 738w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-2-1-300x293.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-2-1-150x147.jpg 150w\" sizes=\"(max-width: 738px) 100vw, 738px\"><figcaption class=\"wp-element-caption\"><em>Using a DMM to ensure power is getting to the compressor <\/em><\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Test the power side of the circuit by doing the following:\n<ol class=\"wp-block-list\">\n<li>Set your DMM to the DC volts setting.&nbsp;<\/li>\n\n\n\n<li>Disconnect the electrical connector going to the compressor.&nbsp;<\/li>\n\n\n\n<li>Turn the ignition on and ensure the vehicle is in a state where the compressor would usually be running.&nbsp;<\/li>\n\n\n\n<li>Connect the negative meter lead to a good ground (the battery&rsquo;s negative terminal works the best). Connect the positive meter lead to the power feed terminal on the harness side of the compressor connector.&nbsp;<\/li>\n\n\n\n<li>If you see battery voltage (or close to it) on your meter, the power side of the circuit is intact.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"738\" height=\"722\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-3.jpg\" alt=\"suspension control module\" class=\"wp-image-16377\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-3.jpg 738w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-3-300x293.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Image-3-150x147.jpg 150w\" sizes=\"(max-width: 738px) 100vw, 738px\"><figcaption class=\"wp-element-caption\"><em>Using a DMM to ensure the compressor has continuity to ground <\/em><\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Next, test the ground side of the circuit by doing the following:\n<ol class=\"wp-block-list\">\n<li>Make sure the vehicle&rsquo;s ignition switch is turned OFF.&nbsp;<\/li>\n\n\n\n<li>Set your digital multimeter (DMM) to the ohms setting.<\/li>\n\n\n\n<li>Connect one meter lead to a good ground (the battery&rsquo;s negative terminal works the best). Connect the other meter lead to the ground terminal on the harness side of the compressor connector.&nbsp;<\/li>\n\n\n\n<li>A reading of anything other than out of limits (OL) indicates the ground side of the circuit is intact. <\/li>\n<\/ol>\n<\/li>\n<\/ul>\n\n\n\n<p>If you find both sides of the circuit to be intact during testing&mdash;but the compressor does not run when it should&mdash;then the compressor is likely faulty and should be replaced.&nbsp;<\/p>\n\n\n\n<p>On the other hand, if you find an issue with the compressor&rsquo;s control circuit, you&rsquo;ll need to trace the wiring diagram and perform further testing. A problem with the power side of the circuit could indicate a failed relay, blown fuse, wiring\/connector issues, or a problem with the suspension control module.<\/p>\n\n\n\n<p>Meanwhile, an issue with the ground side of the circuit usually points to damaged wiring or a poor connection. <\/p>\n\n\n\n<div class=\"rsi-card\">\n  <div class=\"rsi-thumb\">\n    <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/d_noimage.jpg\/b_white\/e_sharpen,e_auto_brightness,e_auto_contrast\/f_auto\/q_auto:eco,dpr_auto\/w_873,h_873,c_pad\/images\/gl28260001_1\">\n  <\/div>\n  <div class=\"rsi-info\">\n    <span class=\"rsi-title\">Before You Order an Air Suspension Compressor, Build the One-Job Order Sheet<\/span>\n    <span class=\"rsi-desc\">Build the right air suspension compressor order the first time by matching your cart to the job scope and checking necessary inclusions.\n<\/span>\n    <a href=\"https:\/\/www.carparts.com\/blog\/before-you-order-an-air-suspension-compressor-build-the-one-job-order-sheet-quickref\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Discover Your Options\">Discover Your Options<\/a>\n  <\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">How to Test an Air Suspension Compressor Relay&nbsp;<\/h2>\n\n\n\n<p>A lot of people also want to know how to test an air suspension compressor relay. You can test the compressor relay with a fused jumper wire.<\/p>\n\n\n\n<p>&nbsp;Be sure to take all of the necessary safety precautions if you decide to attempt this method.<\/p>\n\n\n\n<p>Once again, the information below is generic and for entertainment and educational purposes only. Be sure to follow the factory repair information for your specific application.<\/p>\n\n\n\n<p><strong><em>Tip:<\/em><\/strong><em> You can also test the compressor relay by swapping it with a relay of the same design from another one of the vehicle&rsquo;s circuits.&nbsp;<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Put on your safety glasses.&nbsp;<\/li>\n\n\n\n<li>Consult a repair manual to determine which terminals are which on the relay.&nbsp;<\/li>\n\n\n\n<li>Remove the relay from the power distribution box.&nbsp;<\/li>\n\n\n\n<li>Bypass the relay by connecting a fused jumper wire between the terminals in the power distribution box for the switch (output) portion of the relay.<\/li>\n\n\n\n<li>If the compressor operates with the relay bypassed, the relay is likely faulty and should be replaced. It&rsquo;s also possible that there&rsquo;s a problem with the control side of the relay circuit. So, if replacing the relay doesn&rsquo;t work, you&rsquo;ll need to check the circuit.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Get Your Hands on a New Air Suspension Compressor<\/h2>\n\n\n\n<p>If your air suspension compressor is faulty, don&rsquo;t put off replacing it. It can affect your suspension system&rsquo;s performance, making it risky or uncomfortable to drive. On the bright side, getting your hands on a new one is easy with the help of <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>The best part? You can get your hands on a new air suspension compressor without ever leaving your house. Use your mobile device or computer to visit our website. Then, enter your ride&rsquo;s year, make, and model into the selector to view compatible compressors and change the search filters based on your needs. Check out securely, and wait for your new part &mdash; it&rsquo;s that easy!<\/p>\n\n\n\n<p>We only source our air suspension compressors from the most trusted manufacturers in the industry. They&rsquo;re on hand, ready to ship from a warehouse near you, and available at competitive prices.<\/p>\n\n\n\n<p>Don&rsquo;t drive without a functional suspension system. Shop now to get your hands on a new <a href=\"https:\/\/www.carparts.com\/air-suspension-compressor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"air suspension compressor\">air suspension compressor<\/a> that&rsquo;s built to last in no time!<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>There are a variety of electronically-controlled suspensions in use today. Many of these systems use air springs and an air&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/how-to-test-an-air-suspension-compressor\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1643,"featured_media":16371,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[52,3755],"tags":[2157],"ppma_author":[2622],"class_list":{"0":"post-16370","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-suspension","9":"tag-air-suspension-compressor-2","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Test an Air Suspension Compressor - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"If you suspect that your compressor isn\u2019t working, you&#039;ll need to perform some diagnostic work. Read on to learn how to test an air suspension compressor.\" \/>\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.carparts.com\/blog\/how-to-test-an-air-suspension-compressor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Test an Air Suspension Compressor - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"If you suspect that your compressor isn\u2019t working, you&#039;ll need to perform some diagnostic work. Read on to learn how to test an air suspension compressor.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/how-to-test-an-air-suspension-compressor\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2020-09-18T13:39:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-14T13:24:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/Untitled-design-10.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"700\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Mia Bevacqua, ASE Certified Master Automobile Technician\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mia Bevacqua, ASE Certified Master Automobile Technician\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/how-to-test-an-air-suspension-compressor\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/how-to-test-an-air-suspension-compressor\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"1643\",\"name\":\"Mia Bevacqua\",\"jobTitle\":\"ASE Master Automobile Technician\",\"description\":\"Mia Bevacqua has over 14 years of experience in the auto industry and holds a bachelor\u2019s degree in Advanced Automotive Systems. 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