Oil pressure switch location

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Torbrekke
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Oil pressure switch location

Post by Torbrekke »

Hi
I got a oil pressure light coming on at 1500 rpm when engine is up to temp.
Checked the oil pressure and its 3,5 bar when cold and 2,5 when up to temp.
I did this through the port where the oil pressure switch on the cylinder head is located, and the switch removed. I still got oil pressure light at 1500 rpm when engine is warm.
Is there more pressure switches on the engine, and where are they located?

Thanks:-)
Torbrekke
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Re: Oil pressure switch location

Post by Torbrekke »

Could the oil temp sensor also trigger the red Oil lamp?
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937carrera
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Re: Oil pressure switch location

Post by 937carrera »

2.5 bar at tickover (or even 1500 rpm) seems good, which seems to indicate that the pressure switch is faulty. I don't believe there is a separate oil temperature sensor.

A new one is probably less that 100 Kr.
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alexperkins
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Re: Oil pressure switch location

Post by alexperkins »

I cant remember if these engines have a low and high pressure oil switch. Would need to check the system out
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937carrera
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Re: Oil pressure switch location

Post by 937carrera »

I just had a look in ETKA at switches & senders and could only see the one oil pressure switch, 036 919 081A.

The spec says 0.3-0.6 bar and should be coloured green.

There is also a 2 pin "oil temperature gauge" sender listed, 3AO 919 563 which I think is located on the right hand side of the engine, on top of the oil filter housing. I believe this is actually a feed for the ECU, rather than a temperature gauge
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Re: Oil pressure switch location

Post by alexperkins »

That sounds right. Top right hand side of the block for the pressure sender
Torbrekke
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Re: Oil pressure switch location

Post by Torbrekke »

Thanks for the replies:-) When i checked the oil pressure, i did this with the pressure sensor off the cylinder head, and i still got the oil pressure light, so it seems there is something more which can cause this alarm.
I have looked everywhere for a second pressure switch on the engine, but i cant find one.
Thats why im wondering if there is a temp sensor which can cause this alarm.
Is the temp sensor directly beneath the exhaust manifold, over the oil filter?
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937carrera
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Re: Oil pressure switch location

Post by 937carrera »

Is this of any use ??

http://workshop-manuals.com/volkswagen/ ... re_switch/

If I get chance tomorrow I'll see what happens when I pull the connector off the oil pressure sensor on one of mine
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Re: Oil pressure switch location

Post by alexperkins »

Wrong model. On workshop manuals is a mk3
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937carrera
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Re: Oil pressure switch location

Post by 937carrera »

:oops:

Here's the text from ElsaWin - virtually identical, the picture of the test gear is the same

‒ → Remove oil pressure switch (F1) and screw into tester.
‒ Screw tester into the cylinder head in place of the oil pressure switch.
‒ Connect brown wire of tester to earth (-).
‒ Connect diode test lamp V.A.G 1527 B using aux. cables from V.A.G 1594 A to battery positive (+) and oil pressure switch.
‒ Start engine and increase speed slowly.
At
0.3...0.7 bar
the LED must light up, otherwise renew oil pressure switch.
‒ Increase engine speed further.
At 2000 rpm and an oil temperature of 80 °C the oil pressure should be at least 2.0 bar.
At higher engine speed the oil pressure must not exceed 7.0 bar.
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937carrera
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Re: Oil pressure switch location

Post by 937carrera »

I just tested mine:

Ignition on, oil pressure warning is illuminated for ~5 seconds before going out
Start car, light remains off

It worked the same whether the connector was on the switch or not. (green sensor, top right front of the head, looking to the back)

That's not what I was expecting to see :roll: so I think you are correct something else is triggering the light.
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Re: Oil pressure switch location

Post by Torbrekke »

Did some more testing, same thing still. At 1500 rpm when engine is warm i get the oil light and the beeping. Oil pressure still good. Cant find the temp sensor nor can i get any oil temp reading through the obd2 port.
Just dont understand whats going on :-o
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937carrera
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Re: Oil pressure switch location

Post by 937carrera »

Seems a strange one, which makes it interesting. I have been reading around a bit more and these pages may be useful.( both for T4)

http://www.vwt4forum.co.uk/showthread.php?t=109439
http://www.gowesty.com/tech-article-details.php?id=42

I have again looked in the online manual / parts listing and again cannot find a high oil pressure switch, but that doesn't mean there isn't one.

The key thing from the dynamic oil pressure system is that it is only the high pressure side that activates the buzzer.
Seems a common VW design, but not necessarily right for the 6N2.

Have you tried a continuity check from the (low) oil pressure switch back to the instrument panel, pin 10 on the blue connector (blue black cable) and for correct earthing on the switch. Probably not either, but worth ruling them out ??
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Re: Oil pressure switch location

Post by Torbrekke »

I cant find another pressure switch on tre engine so im not sure if there are any oil pressure monitoring system on this engine (ARC engine code). I think i maybe have to give it up or have a workshop too look at the electrical as i dont know what triggers the alarm. There are no pressure switches anywhere near the oil filter atleast and on the other side of the engine block i can only find what i presume is a knock sensor, and the sensor for the teeth on the flywheel
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937carrera
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Re: Oil pressure switch location

Post by 937carrera »

Well that all ties up to what Alex thought and I found out from the manuals. I was unable to identify what caused the buzzer to operate, and without the other sensor it obviously is not the same as the other VW's.

You are correct on the knock sensor and timing sensor. The additional oil temperature sensor was only installed on a range of engine numbers, so not necessarily there on yours.

Much though I don't like replacing parts without fully diagnosing the fault, I suggest you simply replace the oil pressure sender. You already know that the oil pressure is good, so swap that out for perhaps 100Kr (even at Norwegian prices :)) before you start spending money with a dealer. If you do move to a dealer make sure they know how the oil warning sytem actually works

Please let us know how you get on
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