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  #1  
Old 10-03-2007, 12:03 PM
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Location: France
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Testing of the air temperature sensor

Can some one indicate how to test the air temperature sensor located on the air intake. Can it be very critical to the idle of the engine if the sensor goes faulty.

I assume it is a resitor changing with Temp. What should be the right values versus temperature?

The car is 260E W124 1988 euro.

Thanks in advance

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Present cars:
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Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class 220CDI, 2009, W204

Sold E class 260E, W124, 1988 beloved car sold after 489 000 kilometres of reliable services (engine M103, clutch and 5 speed manual gear box all original).

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  #2  
Old 10-03-2007, 04:01 PM
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Room temp [ approx 20C/68F } - 2500 ohms
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  #3  
Old 10-03-2007, 06:24 PM
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Quote:
Originally Posted by Arthur Dalton View Post
Room temp [ approx 20C/68F } - 2500 ohms
Thank you for this quick reply.
Is it really for AIR temp?
because the value is very similar to the one at 20C for the coolant temperature.
Is it a PTC or a NTC?
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Keep us posted especially if your problem is solved
Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class 220CDI, 2009, W204

Sold E class 260E, W124, 1988 beloved car sold after 489 000 kilometres of reliable services (engine M103, clutch and 5 speed manual gear box all original).

E-class, W210 320CDI, 2000[/B], 225 000km, Sold
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  #4  
Old 10-03-2007, 09:22 PM
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Location: Florida / N.H.
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Quote:
Originally Posted by cc260E View Post
Thank you for this quick reply.
Is it really for AIR temp?
because the value is very similar to the one at 20C for the coolant temperature.
Is it a PTC or a NTC?

IAT

Negative coefficient

1700 ohms at 30C

Last edited by Arthur Dalton; 10-03-2007 at 09:31 PM.
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  #5  
Old 10-04-2007, 01:49 AM
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Join Date: Sep 2007
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G'afternoon all,

I have the sensor as well and wondering what does it affect?

Also how can we clean it ? As it seems to be black with soot...

Thanks in advance. My harness for this sensor is broken and I have proceed to use splicing tape to cover it back.

Enjoy!
Attached Thumbnails
Testing of the air temperature sensor-photo_0013.jpg  
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  #6  
Old 10-11-2008, 03:39 PM
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Quote:
Originally Posted by Arthur Dalton View Post
Room temp [ approx 20C/68F } - 2500 ohms
and if its open circuit ? i cannot measure any resistance. hm i read about IAT moding and so on,
i would like to set a resistor with some value of ohms, and leave the old sensor in the intake hole. Main question for me is what kind of resistor should i buy ? my merc is W210 E250D-turbo 1998' 110kW no MAF sensor,
feels like there is something wrong with diesel/air mixturing..

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