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Old 06-11-2005, 06:48 AM
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Join Date: May 2005
Location: Wanstead, London UK
Posts: 36
Temperature sensor 4cyl 8v 190e testing

I have a uk 2.0 190e which I think is similar to the usa 2.3l. I have cold start problems which I think is related to the temp sensor. From what I have gathered on here the temp sensor is usually a single pin sensor, whereas on mine it appears to be a four pin sensor (beside the fan temp sensor, next to the air cleaner). Has anyone any idea how to test the four pins (numbered 1,2,3,4) with an ohmmeter to figure out if I need to replace this part? Any help appreciated

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Old 06-11-2005, 12:31 PM
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Join Date: Jul 2002
Posts: 1,141
I;ve seen that sensor in the manual...

You'll have to get a response from someone whom's got a cd handy. The 1 pin connector you refer to is for the gauge in the car.

Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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Old 06-11-2005, 01:22 PM
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Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
Testing the coolant temperature sensor ,the risistance value of each intermal sensor must be measured & compared to the other,mersure the resistance between any two of the diagonally opposed terminals.
MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner
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Old 06-11-2005, 05:53 PM
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Join Date: Jan 2002
Location: England
Posts: 1,841
I'm not sure about which pins to test or whether the resistance test values would be different, but here are the temperature sensor resistance values to check if the sensor's working properly (information originally posted by someone else here); on my 2.0 uk car the sensor read correct to within ~5-10 % - but I believe I had a 2 pin sensor...

good luck

The Chart of temps follows!

-20 15.7KOhm
-10 9.2KOhm
0 5.9KOhm
10 3.7KOhm
20 2.5KOhm
30 1.7KOhm
40 1.18KOhm
50 840Ohm
60 600Ohm
70 435Ohm
80 325Ohm
90 247Ohm

2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
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Old 06-11-2005, 06:26 PM
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Join Date: Oct 2003
Location: Ireland
Posts: 166
Just to add I've never seen a 4 pin sensor on a 2.0 ltr engine before...mine is a thick single pin brass jobbie. If you have starting issues as the ambient temps have risen (summers here) then its 99% certain to be the sensor. The same happened to me last summer. I'd just buy a new one they are'nt expensive.



1990 Euro 190e 2.0l Petrol Now Sold Maybe a w116 280se next
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