Ditron 812D D-Jetronic Tester, Searching for instruction |
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Ditron 812D D-Jetronic Tester, Searching for instruction |
nordfisch |
Dec 11 2015, 07:25 PM
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#1
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Member Group: Members Posts: 86 Joined: 11-December 15 From: Germany Member No.: 19,451 Region Association: None |
Hi,
this forum was recommended to me... and this is really a great place for guys like me, interested in the D-Jetronic system. We have a forum in Germany, German and English language "oldtimer.tips", too. We are more conservative than you are, mostly just trying to find out everything about the system and how to repair the components. We are hobbyists mostly MB, but also BMW, VW, Opel, Porsche, Renault, Citroen, Lancia... all the car brands D-Jetronic was installed in. I by myself designed a tool for re-adjusting the trigger points to the original values. Simple to be rebuilded if you have a lathe - I will send you a figure on request. Now my own request: Does anyone here own a Ditron 812D tester, too? I own such a device, but without any instruction. It once came to Europe with the instruction, but it got lost. I bought the Ditron some months ago on ebay from switzerland - the seller told me he had bought it many years ago at ebay USA. It's no problem for me to understand and use the basic testing functions, but this tester is not only a testing - but an ECU-simulating device. I don't really need the Ditron 812D to diagnose or optimize my car - I own some other testers. But because the D-Jetronic-system is my hobby, I would like to understand the additional function, i.e. what the manufacturer intended the user to test / adjust with it. Hope that someone still has the instruction for the tester... My tester has serial #119 - don't know how many were built at all. P.B. "Brad" Anders described the tester: D-Jetronic Testers as being similar to the Janbo Model 112 he described more detailed. Does anyone own the tester / the instruction? Please help... Regards Norbert |
nordfisch |
Jan 24 2016, 12:24 PM
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#2
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Member Group: Members Posts: 86 Joined: 11-December 15 From: Germany Member No.: 19,451 Region Association: None |
Hi Jeff,
there are 3 different types of 'Saugrohrdruckfühler', maybe called MPS or MAP sensor (didn't realize a difference before, I'm no native speaker...) The first type, installed in very early Volkswagen and later only Citroën, is combined with an absolute pressure sensor in any setup. It has aneroid cells installed that don't correspond with the air pressure outside because the housing is fully sealed. This hence can not take the atmospheric pressure into consideration at all. The second type, installed in most 914 (model without the black cap) has aneroid cells installed that don't correspond with the air-pressure outside. But the full-load-diaphragm installed in this type can correct the full-load-curve depending on the outside air pressure a little bit. Unfortunately, this diaphragm gets leaky after some wear, 'type II'-sensors tend to go defective much more often than the other types. The third type (installed in late cars, model with the black cap) has one vented and a second non-vented aneroid cell installed, hence can correct the curve depending on outside air-pressure, does altitude compensation. Unfortunately, you can't install a 'type III' instead of a 'type II' - sensor because then the full-load-enrichment-function is missing that is done inside the sensor at 'type II', but done by the TPS at 'type III' ---- But - maybe I didn't understand your annotation in full. Contact Volker directly- he is always interested in eliminating errors or misunderstandable statements. And - he speaks much better English than me. Regards Norbert --- Following the link https://oldtimer.tips/en/d-jetronic/55-mapsensor, you will find a list of all D-Jetronic map-sensors and their features, page down, section 4.5ff |
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