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does anybody knows what is the oil check beeping sound connected to ?
I think some sensor but which one ?
what happens is that after say 4 rpms the board comp beeps and light the oil check so I assume I have a fault connection or fault sensor.
You are the guy running Audi 90 cluster with a 1.8T engine - right ?
If so then the Autocheck module needs to be made happy with signals it gets from engine about oil pressure.
There are two signals that the 90 cluster uses (along with engine speed signal) to determine what kind of oil pressure alarm to trigger.
Firstly there is the 'idiot switch' for oil pressure - this is normally closed (the big red light on dash is ON) until engine is running and creating more than ~0.3bar pressure - light goes OFF.
That one is labelled F22 on contemporary schematics.
Then there is F1 which is a normally open switch which only closes when pressure exceeds an amount defined by the physical sensor - there are 1.2 and 1.8bar versions from memory. An alarm from this signal is only relevant when engine speed exceeds approx 2000rpm.
To pinpoint the exact correct wires for your application - does your Audi 90 have the oil pressure monitor relay fitted I wonder - what was the original engine ?
Did you remove all the wiring in the auxiliary relay panel (above driver pedals) ?
Is the buzzing coming from auto check module in the 90 cluster or the aux relay panel ?
Does the 1.8T engine have accommodation for both F1 and F22 ?
Assuming the 1.8T engine has the standard Audi M10x1.0 fitting on the block for an F1 or F22 then it is usually pretty easy to fix a small T-piece to drive them both along with a signal for an oil pressure gauge. Easy peasy with central instruments from Audi 80/90.
There are two signals that the 90 cluster uses (along with engine speed signal) to determine what kind of oil pressure alarm to trigger.
Firstly there is the 'idiot switch' for oil pressure - this is normally closed (the big red light on dash is ON) until engine is running and creating more than ~0.3bar pressure - light goes OFF.
That one is labelled F22 on contemporary schematics.
Then there is F1 which is a normally open switch which only closes when pressure exceeds an amount defined by the physical sensor - there are 1.2 and 1.8bar versions from memory. An alarm from this signal is only relevant when engine speed exceeds approx 2000rpm.
To pinpoint the exact correct wires for your application - does your Audi 90 have the oil pressure monitor relay fitted I wonder - what was the original engine ?
Did you remove all the wiring in the auxiliary relay panel (above driver pedals) ?
Is the buzzing coming from auto check module in the 90 cluster or the aux relay panel ?
Does the 1.8T engine have accommodation for both F1 and F22 ?
Assuming the 1.8T engine has the standard Audi M10x1.0 fitting on the block for an F1 or F22 then it is usually pretty easy to fix a small T-piece to drive them both along with a signal for an oil pressure gauge. Easy peasy with central instruments from Audi 80/90.
So, the original engine was 2.0 20V NM (5 cyl).
The so called idiot switch, I don't think is connected to the dash at all, because it does not turn any light on, besides it does not trigger the big red oil light on the auto check module.
The only thing that the au. module displays once the engine starts is the regular brake light check and later gives me an error for front light due to the xenon adapter.
According to what you've explained I would say that the F1 switch does not close since the beep sound coming out of the auto check module happens once some rpms are reached.
I am not sure if my audi has the oil pressure monitor relay fitted but I would guess it does, since the original setup had no problem of any kind.
No wires were removed from the auxiliary relay panel.
The beeps are coming out from the auto check 100% (dash board)
The 1.8T has one oil pressure sensor that is currently connected to the oil pressure (the original one from the old engine) gauge in the central column and one oil temp sensor that is respectively connected to the proper gauge.
As for the switches F1 and F22 I would assume that if they were in the coupe they should've remained since no wiring and switches were removed in general.
The only cut wires I have were linked directly to the old ECU where some of them are now being used to connect to the new ECU and some are going to the engine.
The so called idiot switch, I don't think is connected to the dash at all, because it does not turn any light on, besides it does not trigger the big red oil light on the auto check module.
The only thing that the au. module displays once the engine starts is the regular brake light check and later gives me an error for front light due to the xenon adapter.
According to what you've explained I would say that the F1 switch does not close since the beep sound coming out of the auto check module happens once some rpms are reached.
I am not sure if my audi has the oil pressure monitor relay fitted but I would guess it does, since the original setup had no problem of any kind.
No wires were removed from the auxiliary relay panel.
The beeps are coming out from the auto check 100% (dash board)
The 1.8T has one oil pressure sensor that is currently connected to the oil pressure (the original one from the old engine) gauge in the central column and one oil temp sensor that is respectively connected to the proper gauge.
As for the switches F1 and F22 I would assume that if they were in the coupe they should've remained since no wiring and switches were removed in general.
The only cut wires I have were linked directly to the old ECU where some of them are now being used to connect to the new ECU and some are going to the engine.
I suspect the 1.8T engine only has one of the two oil pressure switches that the NM had. Tell me the engine code you have that 1.8T motor. I am 99% sure the NM motor had the oil pressure relay monitor as well - send a pic of the relays fitted above the drivers pedals.
I suspect the 1.8T engine only has one of the two oil pressure switches that the NM had. Tell me the engine code you have that 1.8T motor. I am 99% sure the NM motor had the oil pressure relay monitor as well - send a pic of the relays fitted above the drivers pedals.
the engine is AEB.
one more question if I may
I've changed so far 3 dash boards and all of them are showing wrong RPMS. I assume that this is because they are all supposed to work with 5 cyl engine hence the difference counting the signal for 4 cyl engine.
The one I have at present should be from 4 cyl ACE engine with 260 km. on the speedo, however I still have the rpms problem.
Is this something that I could easily fix or I should keep on looking for the proper dash ? Also is there a possibility where the autocheck is doing this change in the rpms ?
Yes you will need a 4-cyl rev counter but I have no idea if the scaling is the same across the different engine types and generations of instrument. I know the late 80 Cabrio used the non turbo 1.8L ADR engine which is same vintage as AEB but again no evidence that rpm scaling is same from the two different ecu.
You might also get scaling wrong with water temp sensor and instrument - I dunno if they are similar spec but I could probably find out with enough searching.
So with reference to http://www.s2central.net/S2_Schematics/A/A14.PDF for the NM wiring it confirms the oil pressure monitor (OPM) relay was fitted to that setup - It is J114 - lives in aux relay position 6 above drivers pedals. Hopefully you haven't chopped that up as part of conversion and you should be able to integrate with 80/90 cluster very nicely on the AEB.
Look at the NM wiring on page 14/5 - observe tracks 51-55 for J114 with pinout as follows
1 - blue wire from alternator (tells it when engine is running)
2 - white/grey wire from normally open 1.8bar switch (F1 on the NM)
3 - not used
4 - black wire 12V ignition ON
5 - brown 0V
6 - blue/black wire to the OIL lamp (K3) on the 90 cluster at pin 24 on the yellow plug
7 - not used
8 - green/blue wire with RPM signal (so OPM knows when to raise alarm on pin 6) - this connects to pin 22 on the yellow cluster plug. The source is obviously the ECU... so scaling may be off for your 4-cyl application - you would need to experiment and see behaviour.
Note also that F22 (the normally closed 0.3bar switch) is wired in parallel to the pin 6 output from the OPM... this switch is closed when the engine is OFF so thats how the OIL warning lamp is illuminated in the cluster. When healthy engine starts, that switch opens at 0.3bar pressure and the OIL light gives out.
If F1 CLOSES above ~2k rpm then pin 6 of the OPM is switched to 0V to light the lamp and you should also get an audible alarm to say your oil pressure is below 1.8bar.
Simples !
Let me find an AEB diagram and see what sensor(s) are in play there.
Note - http://www.s2central.net/S2_Schematics/A/A09.PDF is schematics for the ACE 4-cyl engined Audi 80/90 - also has identical OPM wiring (on sheet 6) but I will bet my left nut that the part number is different on the J114 controller due to 4-cyl RPM scaling... I will try to verify that today and hopefully have my manhood in tact afterwords !
OK - now here is the scoop - after much detective work on the V-pages of the family album I can see that the 4-cyl RPM counter on the Cabriolet changed at EXACTLY the same time the ADR engine was introduced - it aligns with 4G-WN-004.000
The old 4-cyl rpm counter for 80/90/Cabrio was 893 919 253 - you will find that on A100 models also
The new 4-cyl rpm counter (only fitted to Cabrio from Sept 1997 onwards) is 8A1 919 253C - I would be pretty confident that is the one required for correct RPM scaling to work from the ADR or AEB Motronic ECU
Looking at AEB diagrams now - confirms use of ONLY the F1 switch (068 919 081) which closes when pressure falls below 1.4bar...
There should be a white/grey wire from the AEB wiring loom on a black 10-pin plug... the same one where you found RPM signal already.
You need to connect this white/grey wire from F1 onto pin 2 (two) on the OPM relay - the 4-cyl version so that rpm scale is correct (otherwise will be 20% or 25% wrong rpm threshold).
You should also insulate any dangling black/blue wires from your OPM relay - the only one you need should connect from OPM pin 6 to the cluster as described above.
Just to complete the loop on this one - the ADR (1.8 4-cyl 5V non turbo) and AEB (1.8T 4-cyl 5V turbo) of circa 1997 do indeed use the same Motronic ECU family - many many pins in common for inputs & outputs so the RPM signal to the cluster should be the same scale.
You can also use 80 B4 instrument cluster. I did same swap with my car 2.0 66kw ABT to 1.8T 110kw AEB. Rev counter works correctly, so simple and cheap solution is to get one 4-cylinder engine cluster from 80 B4.
But I also had problem with autocheck oli light. There are to ways to get rid off that 2nd warning (usually shows up when rmps are over 2500) - install F22 sensor or you can ground blue/black wire from autocheck, because the same wire connects to the sensor.
I will check what tacho that is from ABT engined B4 as well. The sense of that F22 signal changes on some engine and cluster combinations. On the 5 cyl clusters grounding the F22 wire turns the oil lamp ON... Which is a bit rubbish on its own as if the wire is disconnected from sensor you get no oil light. That's why the n/o switch F1 exists so that you get an oil warning when that is unplugged.
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