{"id":2587,"date":"2023-11-14T20:03:20","date_gmt":"2023-11-14T19:03:20","guid":{"rendered":"https:\/\/mbci.mackuz.ovh\/?p=2587"},"modified":"2023-11-14T20:03:20","modified_gmt":"2023-11-14T19:03:20","slug":"checking-choke-system","status":"publish","type":"post","link":"https:\/\/mbci.mackuz.ovh\/index.php\/2023\/11\/14\/checking-choke-system\/","title":{"rendered":"Checking choke system"},"content":{"rendered":"

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07.3-125 Checking choke system<\/strong><\/div>\n<\/div>\n<\/td>\n
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Test values in bar gauge pressure<\/strong><\/div>\n<\/div>\n<\/td>\n
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Engine<\/div>\n<\/div>\n<\/td>\n
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110.984\/985 110.986\/987<\/div>\n<\/div>\n<\/td>\n
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110.988\/989 110.990<\/div>\n<\/div>\n<\/td>\n
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System pressure at idle with engine cold or at operating temperature<\/div>\n<\/div>\n<\/td>\n
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5.0-5.6<\/div>\n<\/div>\n<\/td>\n
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Warm-up compen\u00adsator stabilized<\/div>\n<\/div>\n<\/td>\n
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3.4-3.8 at 530 mbar ’)<\/div>\n<\/div>\n<\/td>\n
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3.6-4.0<\/div>\n<\/div>\n<\/td>\n
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Control pressure at idle with \u201e….., Full load ennch-engme at operating temperature mentatidle<\/div>\n
(vacuum hose pulled of)<\/div>\n<\/div>\n<\/td>\n
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2.8-3.2<\/div>\n<\/div>\n<\/td>\n
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Control pressure according to ambient temperature at idle with engine cold<\/div>\n<\/div>\n<\/td>\n
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min. 0.5<\/div>\n
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Starting voltage<\/div>\n<\/div>\n<\/td>\n
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10 V<\/div>\n<\/div>\n<\/td>\n
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) If the control pressure is not attained, check intake manifold vacuum (section „Checking control pressure at idle with engine at operating temperature”).<\/div>\n<\/div>\n<\/td>\n
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Special tool<\/strong><\/div>\n<\/div>\n<\/td>\n
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Pressure measuring device<\/div>\n<\/div>\n<\/td>\n
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\"m110<\/div>\n<\/td>\n
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102 589 00 21 00<\/div>\n<\/div>\n<\/td>\n
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Conventional tools<\/strong><\/div>\n<\/div>\n<\/td>\n
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Voltmeter and ohmmeter<\/div>\n<\/div>\n<\/td>\n
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Revolution counter<\/div>\n<\/div>\n<\/td>\n
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Checking<\/strong><\/div>\n<\/div>\n<\/td>\n
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1 Pull cable plug from warm-up compensator and from cold starting valve.<\/div>\n<\/div>\n<\/td>\n
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07.3.2 I la\u20141 25\/1<\/div>\n<\/div>\n<\/td>\n
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2\u00a0 \u00a0Checking starting voltage.<\/div>\n
Pull plug from ignition transmitter on switching unit (green cable) or plug protective plug, part no. 102 589 02 21 00, on diagnosis socket.<\/div>\n
Operate starter for a short moment while reading voltage. Nominal value min. 10 Volts. If nominal value is not attained, test battery, charge or replace, if required.<\/div>\n
3\u00a0 \u00a0Check air flow sensor plate and control piston for easy operation, check fuel pressures and for internal leaks, as well as stabilizing time of warm-up compen\u00adsator (07.3-120).<\/div>\n
Checking cold-starting valve for function and leaks<\/strong><\/div>\n<\/div>\n<\/td>\n
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4\u00a0 \u00a0Unscrew fuel line on cold-starting valve (98) and remove cold-starting valve.<\/div>\n
5\u00a0 \u00a0Loosen fuel line (arrow) on fuel distributor and turn in such a manner that the cold starting valve can be again connected. Then hold cold starting valve into a container.<\/div>\n<\/div>\n<\/td>\n
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Checking function<\/strong><\/div>\n
6\u00a0 \u00a0Switch-on ignition.<\/div>\n
7\u00a0 \u00a0Connect cold starting valve with separate cable to B + and ground. Cold starting valve should eject in shape of cone.<\/div>\n
Attention!<\/strong><\/div>\n
Connect cable first to cold starting valve so that no sparking occurs.<\/div>\n
No separate cable need be used below +15 \u00b0C, plug-on cable plug instead and pull cable plug from safety switch.<\/div>\n<\/div>\n<\/td>\n
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Checking for leaks<\/strong><\/div>\n
8\u00a0 \u00a0Loosen separate cable connection on cold starting valve. Dry cold starting valve on nozzle. No drops should form.<\/div>\n
9\u00a0 \u00a0Switch off ignition.<\/div>\n
10\u00a0 \u00a0Mount cold starting valve with new seal.<\/div>\n
11\u00a0 \u00a0 Plug cable plug on safety switch and on cold-starting valve again.<\/div>\n<\/div>\n<\/td>\n
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07.3.2 I la\u20141 25\/2<\/div>\n<\/div>\n<\/td>\n
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Testing thermo time switch<\/strong><\/div>\n<\/div>\n<\/td>\n
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The cold starting valve is actuated by closed thermo time switch only at coolant temperatures below + 15\u00b0C.<\/div>\n
The actuating time increases with decreasing tempera\u00adture and attains approx. 12 seconds at \u201420 \u00b0C.<\/div>\n<\/div>\n<\/td>\n
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99 Thermo time switch<\/div>\n<\/div>\n<\/td>\n
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Testing below +15 \u00b0C coolant temperature<\/strong><\/div>\n<\/div>\n<\/td>\n
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12\u00a0 \u00a0Connect voltmeter to connection of cold starting valve.<\/div>\n
13\u00a0 \u00a0 Actuate starter. Depending on coolant tempera\u00adture, voltmeter should then indicate 10 Volts for a given period.<\/div>\n
The switching time increases with decreasing tempera\u00adture by approx. 1.5 seconds per 5 \u00b0C.<\/div>\n
e.g. + 15 \u00b0C =0 seconds + 10 \u00b0C= 1.5 seconds<\/div>\n
It is recommended to test thermo time switch additionally with an ohmmeter for this test.<\/div>\n
Test value below+15 \u00b0C:<\/div>\n
Connection G-ground = approx. 48 12 Connection W-ground = approx. 012<\/div>\n
(Contacts in switch closed).<\/div>\n<\/div>\n<\/td>\n
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Testing above +15 \u00b0C coolant temperature<\/strong><\/div>\n<\/div>\n<\/td>\n
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Above +15 \u00b0C coolant temperature the thermo time switch can be tested only by means of an ohmmeter. For this purpose, pull plug from thermo time switch.<\/div>\n
Test values above <\/strong>+15 \u00b0C:<\/div>\n
Connection G-ground = approx. 62 12 Connection W-ground = approx. 270 12<\/div>\n
(Contacts in switch open). Re-attach plug.<\/div>\n<\/div>\n<\/td>\n
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07.3.2 I la\u20141 25\/3 F2<\/div>\n<\/div>\n<\/td>\n
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98\u00a0 Cold starting valve<\/div>\n
99\u00a0 Thermo time switch c To terminal 50<\/div>\n<\/div>\n<\/td>\n
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Testing cutoff point of auxiliary air valve<\/strong><\/div>\n<\/div>\n<\/td>\n
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14\u00a0 \u00a0 Following a cold start, the engine speed should amount to approx. 800\u20141000\/min. The speed will then increase to approx. 1 200\u20141300\/min, and will drop to normal idle speed at approx. 70 \u00b0C.<\/div>\n
15\u00a0 \u00a0Stop engine. Disconnect pressure measuring device while catching fuel with a rag.<\/div>\n
16\u00a0 \u00a0Connect fuel lines, run engine once again and check all fuel connections for leaks.<\/div>\n<\/div>\n<\/td>\n
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07.3.2 I la \u20141 25\/4 F2<\/div>\n<\/div>\n<\/td>\n
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    07.3-125 Checking choke system   Test values in bar gauge pressure   Engine 110.984\/985 110.986\/987 110.988\/989 110.990 System pressure at idle with engine cold or at operating temperature 5.0-5.6 Warm-up compen\u00adsator stabilized 3.4-3.8 at 530 mbar ’) 3.6-4.0 Control pressure at idle with \u201e….., Full load ennch-engme at operating temperature mentatidle (vacuum hose pulled of) 2.8-3.2   Control pressure according to ambient temperature at idle with engine cold min. 0.5 (refer to diagram)   Starting voltage 10 V   ) If the control pressure is not attained, check intake manifold vacuum (section „Checking control pressure at idle with engine at operating temperature”).   Special tool   Pressure measuring device 102 589 00 21 00   Conventional tools   Voltmeter and ohmmeter   Revolution counter   Checking   1 Pull cable plug from warm-up compensator and from cold starting valve.   07.3.2 I la\u20141 25\/1 F 2       2\u00a0 \u00a0Checking starting voltage. Pull plug from ignition transmitter on switching unit (green cable) or plug protective plug, part no. 102 589 02 21 00, on diagnosis socket. Operate starter for a short moment while reading voltage. Nominal value min. 10 Volts. If nominal value is not attained, test battery, charge or replace, if required. 3\u00a0 \u00a0Check air flow sensor plate and control piston for easy operation, check fuel pressures and for internal leaks, as well as stabilizing time of warm-up compen\u00adsator (07.3-120). Checking cold-starting valve for function and leaks 4\u00a0 \u00a0Unscrew fuel line on cold-starting valve (98) and remove cold-starting valve. 5\u00a0 \u00a0Loosen fuel line (arrow) on fuel distributor and turn in such a manner that the cold starting valve can be again connected. Then hold cold starting valve into a container.   Checking function 6\u00a0 \u00a0Switch-on ignition. 7\u00a0 \u00a0Connect cold starting valve with separate cable to B + and ground. Cold starting valve should eject in shape of cone. Attention! Connect cable first to cold starting valve so that no sparking occurs. No separate cable need be used below +15 \u00b0C, plug-on cable plug instead and pull cable plug from safety switch.   Checking for leaks 8\u00a0 \u00a0Loosen separate cable connection on cold starting valve. Dry cold starting valve on nozzle. No drops should form. 9\u00a0 \u00a0Switch off ignition. 10\u00a0 \u00a0Mount cold starting valve with new seal. 11\u00a0 \u00a0 Plug cable plug on safety switch and on cold-starting valve again.   07.3.2 I la\u20141 25\/2 F 2       Testing thermo time switch The cold starting valve is actuated by closed thermo time switch only at coolant temperatures below + 15\u00b0C. The actuating time increases with decreasing tempera\u00adture and attains approx. 12 seconds at \u201420 \u00b0C. 99 Thermo time switch   Testing below +15 \u00b0C coolant temperature   12\u00a0 \u00a0Connect voltmeter to connection of cold starting valve. 13\u00a0 \u00a0 Actuate starter. Depending on coolant tempera\u00adture, voltmeter should then indicate 10 Volts for a given period. The switching time increases with decreasing tempera\u00adture by approx. 1.5 seconds per 5 \u00b0C. e.g. + 15 \u00b0C =0 seconds + 10 \u00b0C= 1.5 seconds It is recommended to test thermo time switch additionally with an ohmmeter for this test. Test value below+15 \u00b0C: Connection G-ground = approx. 48 12 Connection W-ground = approx. 012 (Contacts in switch closed).   Testing above +15 \u00b0C coolant temperature   Above +15 \u00b0C coolant temperature the thermo time switch can be tested only by means of an ohmmeter. For this purpose, pull plug from thermo time switch. Test values above +15 \u00b0C: Connection G-ground = approx. 62 12 Connection W-ground = approx. 270 12 (Contacts in switch open). Re-attach plug. 07.3.2 I la\u20141 25\/3 F2 98\u00a0 Cold starting valve 99\u00a0 Thermo time switch c To terminal 50         Testing cutoff point of auxiliary air valve   14\u00a0 \u00a0 Following a cold start, the engine speed should amount to approx. 800\u20141000\/min. The speed will then increase to approx. 1 200\u20141300\/min, and will drop to normal idle speed at approx. 70 \u00b0C. 15\u00a0 \u00a0Stop engine. Disconnect pressure measuring device while catching fuel with a rag. 16\u00a0 \u00a0Connect fuel lines, run engine once again and check all fuel connections for leaks.   07.3.2 I la \u20141 25\/4 F2      <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","footnotes":""},"categories":[27,33],"tags":[],"class_list":["post-2587","post","type-post","status-publish","format-standard","hentry","category-m110","category-mechanical-gazoline-injection-system-cis"],"aioseo_notices":[],"featured_image_src":null,"author_info":{"display_name":"mackuz","author_link":"https:\/\/mbci.mackuz.ovh\/index.php\/author\/mackuz\/"},"_links":{"self":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/comments?post=2587"}],"version-history":[{"count":1,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2587\/revisions"}],"predecessor-version":[{"id":2588,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2587\/revisions\/2588"}],"wp:attachment":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/media?parent=2587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/categories?post=2587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/tags?post=2587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}