Originally posted by raymor
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S4 AAN into Type 85CQ engine loom wiring
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Originally posted by paulmac View PostAlso need my rpm working on the analogue dash, spink did u ever get a chance 2 look in2 making up something
it appears 034 dont sell them anymore by the way,certainly doesnt show in their search anymore
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Originally posted by spink View PostYou need a voltage divider,i know 034 sell them for about £60 but I reckon one could be made for peanuts.If you are not in a rush I can make you one at some point when i make one for mine.
What does work is hooking up Motronic rpm signal direct to the tacho and then splicing in a 2Kohm resistor straight to the ground, BTDT.
Hope this helps.www.quattro.ca
B2: 82 Urq into Sport quattro, 82 4000 2-door, 83 80q 2 Door, 83 Ur-q CDN, 85 Ur-q Euro with 3B, 86 4kq, 59,000km
B3/B4: 91 CQ, 93 90q 2.5TDI, 94 80q avant 2.5tdi, 94 S2 Avant
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Been looking at this for someone else... anybody else got evidence that the AAN rpm output will drive analog tacho from circa 1986 KV engined CQ ?
I don't understand the above post claiming that a 2kohm 'pull down' resistor is going to help. I am hoping that the tacho gauge is looking for good clean pulse edges and that a nominal 5V or 12V level is not important. I could cook up a little amplifier if it really is required... will find out myself soon enough if nobody else has more experience to share here.Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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something I ran across today in the shop that I figured I'd add to the archives. We were setting up an AAN harness into a 90 quattro and had no start after wiring all the necessary circuits (black wire for the coils to 12v, blue wires for the injectors to 12v and red wire to constant battery 12v). we were able to communicate with the ecu as well as see rpm in vagcom, but no start (no injector or coil pulse). It turns out, if you 'force' 12v to the fuel injectors instead of routing it through the fuel pump relay like you are supposed to, the ecu will not pulse injectors or coils. moving the blue wires over to the 87a terminal on the fuse box along with the requisite fpr trigger and suddenly pulsing of injectors and coils started.
so again to be clear, if the ecu shows 12v on the injector reference line when its not supposed to (with key on but not while cranking as it triggers the fpr) the ecu will not start pulsing injectors.
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Also if you want to keep your check engine light out you can use my method below to keep the ecm happy.
http://www.motorgeek.com/viewtopic.p...c6b3&start=175
Cheers,
Craig
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