{"id":497,"date":"2016-07-01T12:32:01","date_gmt":"2016-07-01T12:32:01","guid":{"rendered":"http:\/\/dgmotorservices.co.uk\/blog\/?p=497"},"modified":"2016-07-01T12:35:34","modified_gmt":"2016-07-01T12:35:34","slug":"vw-golf-engine-and-epc-light-17951-and-17579-faults","status":"publish","type":"post","link":"http:\/\/dgmotorservices.co.uk\/blog\/vw-golf-engine-and-epc-light-17951-and-17579-faults\/","title":{"rendered":"VW Golf &#8211; Engine and EPC light &#8211; 17951 and 17579 faults"},"content":{"rendered":"<p>VW Golf &#8211; 2007<\/p>\n<p>Customer reports Engine and EPC light are on, Car drives but had poor throttle response and sometimes no throttle control.<\/p>\n<p>Customer reports car was jerking and local garage replaced coil pack &#8211; with the coil pack replaced the car wouldn&#8217;t rev up and was looked into further. They replaced the throttle body and the car now drove but wasn&#8217;t correct.<\/p>\n<p>A full scan was carried out and the main faults were these:<\/p>\n<div class=\"shortcode-list shortcode-list-check\">\r\n<ul>\r\n \t<li>17951 - Angle Sensor 1 for Throttle Actuator (G187) \u00a0-\u00a0P1543 - 000 - Signal too Small - MIL ON<\/li>\r\n \t<li>17579 - Angle Sensor 2 for Throttle Actuator (G188) Implausible Signal -\u00a0P1171 - 000 -\u00a0 - Intermittent<\/li>\r\n \t<li>+ Various no communication faults with other ECUs (Guessing the ECU has been unplugged for testing)<\/li>\r\n<\/ul>\r\n<\/div>\n<p>With the airbox removed a quick inspection of the engine showed a 2nd hand throttle body had been fitted, the throttle body wiring had been repair (poorly)<\/p>\n<p>First test was to check the supply feed and earth to throttle body &#8211; quick check with the multimeter showed a steady 5 volts. \u00a0 The next test was to measure the input and throttle feedback circuits, using a 4 channel scope &#8211;<\/p>\n<div style=\"width: 650px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/c5.staticflickr.com\/8\/7541\/27911963452_a14fb46ab2_z.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/c5.staticflickr.com\/8\/7541\/27911963452_a14fb46ab2_z.jpg\" width=\"640\" height=\"480\" \/><\/a><p class=\"wp-caption-text\">Scope setup &#8211; showing poorly repaired wires for throttle taped to main loom<\/p><\/div>\n<div style=\"width: 650px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/www.flickr.com\/photos\/80947042@N07\/27979652286\/in\/dateposted\/\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/c7.staticflickr.com\/8\/7595\/27979652286_e39f5b427f_z.jpg\" width=\"640\" height=\"480\" \/><\/a><p class=\"wp-caption-text\">Scope wires &#8211; back probed into throttle body<\/p><\/div>\n<div class=\"shortcode-list shortcode-list-check\">\r\n<ul>\r\n \t<li>Channel 1 (Yellow) is 5 volt input voltage to throttle body<\/li>\r\n \t<li>Channel 2 (Blue) is\u00a0sensor 1 on throttle body (reads 0-5 Volts)<\/li>\r\n \t<li>Channel 3 (Purple) is\u00a0sensor 2 on throttle body (reads 5-0 Volts)<\/li>\r\n \t<li>As sensor 1+2 work backwards to each other the total off both sensors should equal\u00a0the supply voltage - on idle sensor 1 is 0.6 Volts and sensor 2 is 4.4 Volts<\/li>\r\n<\/ul>\r\n<\/div>\n<div style=\"width: 650px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/www.flickr.com\/photos\/80947042@N07\/\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/c7.staticflickr.com\/8\/7346\/27400707094_a6b3521524_z.jpg\" width=\"640\" height=\"363\" \/><\/a><p class=\"wp-caption-text\">Scope pattern<\/p><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"http:\/\/dgmotorservices.co.uk\/blog\/wp-content\/uploads\/2016\/07\/Golf-throttle-bodyEDIT.jpg\" width=\"1174\" height=\"665\" \/><\/p>\n<p>&nbsp;<\/p>\n<div class=\"shortcode-list shortcode-list-check\">\r\n<ul>\r\n \t<li>Point 1 - from idle quick press on the throttle<\/li>\r\n \t<li>Point 2 - as the throttle shuts sensor 1 stops reading any voltage<\/li>\r\n \t<li>Point 3 - 2 more presses on the throttle (Sensor 1 has stopped reading but sensor 2 is reading correctly)<\/li>\r\n<\/ul>\r\n<\/div>\n<p>With a phone call to the customer a new throttle body was ordered and fitted. \u00a0 Using VCDS the throttle body adaption was carried out and the car was started and tested. \u00a0 This time I used the graph function on VCDS to test the throttle body as this is what the ECU is seeing and would also test the repaired wiring<\/p>\n<p><a href=\"https:\/\/www.flickr.com\/photos\/80947042@N07\/\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/c3.staticflickr.com\/8\/7708\/27979667386_e70e1f42c1_z.jpg\" width=\"640\" height=\"512\" \/><\/a><\/p>\n<p>VCDS turns the voltage into a percentage but you can see the sensor 1 and 2 readings are now correct. \u00a0We taped and secured the repair wires from the other garages repair.<\/p>\n<p>This shows why trying to fix faults with 2nd hand parts is a lottery as the 2nd hand part they brought had the same fault as the original unit!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>VW Golf &#8211; 2007 Customer reports Engine and EPC light are on, Car drives but had poor throttle response and sometimes no throttle control. Customer reports car was jerking and local garage replaced coil pack &#8211; with the coil pack replaced the car wouldn&#8217;t rev up and was looked into further. They replaced the throttle body and the car now drove but wasn&#8217;t correct. A full scan was carried out and the main faults were these: With the airbox removed a quick inspection of the engine showed a 2nd hand throttle body had been fitted, the throttle body wiring had been repair (poorly) First test was to check the supply feed and earth to throttle body &#8211; quick check with the multimeter showed a steady 5 volts. \u00a0 The next test was to measure the input and throttle feedback circuits, using a 4 channel scope &#8211; &nbsp; With a phone call to the customer a new throttle body was ordered and fitted. \u00a0 Using VCDS the throttle body adaption was carried out and the car was started and tested. \u00a0 This time I used the graph function on VCDS to test the throttle body as this is what the ECU is seeing and would also test the repaired wiring VCDS turns the voltage into a percentage but you can see the sensor 1 and 2 readings are now correct. \u00a0We taped and secured the repair wires from the other garages repair. This shows why trying to fix faults with 2nd hand parts is a lottery as the 2nd hand part they brought had the same fault as the original unit!<\/p>\n","protected":false},"author":3,"featured_media":500,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[37,28],"tags":[55,54,53,52],"class_list":["post-497","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dg-motor-services-repair-work","category-dg-motor-services-info","tag-55","tag-54","tag-throttle-body","tag-vw-golf"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"http:\/\/dgmotorservices.co.uk\/blog\/wp-content\/uploads\/2016\/07\/Golf-throttle-bodyEDIT.jpg","jetpack_shortlink":"https:\/\/wp.me\/p2ylNZ-81","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/posts\/497","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=497"}],"version-history":[{"count":5,"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/posts\/497\/revisions"}],"predecessor-version":[{"id":504,"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/posts\/497\/revisions\/504"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/media\/500"}],"wp:attachment":[{"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=497"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=497"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/dgmotorservices.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}