It's for the EFI system.

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

Obviously. But what EXACTLY does it control/influence in the FI system?

__________________
http://i193.photobucket.com/albums/z...-RESIZED-1.jpg
1991 300E - 212K and rising fast...

I would think that since warmer air is less dense, the air intake tamp sensor probably adjusts the perameters for the MAF, basically "warning" the MAF of the density of the incoming air, allowing the system to adjust quicker. Just a guess.

__________________
1983 380SL
1995 C280
1995 S500 coupe
1990 Mazda Miata
2004 Suzuki Hayabusa

air intake sensor with oxygen sensor controls lean or rich mixture.Thats like my chip fools air intake sensor to read perfect temps,so mixture will be at perfect 14.7 to 1.
I now before my chip in cold winter below 25 degrees my mileage suffered.Now its stable on cold days as warm days.

__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

With Ohm meter on the sensor connections, here are the readings

Attached Files

M104 IAT Temp sensor.pdf (33.0 KB, 1760 views)

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thanks mbdoc! I'll check mine tonight.

__________________
1983 380SL
1995 C280
1995 S500 coupe
1990 Mazda Miata
2004 Suzuki Hayabusa

I got my genuine MB temp sensor for €12 and installed it in 30 secs. My old one was open circuit so I knew it was dead.

New one made hot starts a lot smoother.

This was on a 300-24 so it's the mechanical KE Jetronic not the integrated system you have.

RayH