water temp sensor orientation - Benzworld.org

andytechinc · 02-12-2008, 06:12 AM

I am trying to change out the water temp sensor for the cis-e injection system on my 91 300se. The plug and sensor are both four pronged, but the plug seems to have a flat spot on its connector that would orientate it to the sensor prongs, and the neither the old sensor or the new one seem to have a mating flat spot. How does one know the oreintation to attach the plug to the sensor correctly? does the oreintation matter? it looks as though I could attach it any of 4 different orientations by spinning the plug 90 degs each attempt. thanks for your help

**a3jeroen** · 02-12-2008, 09:17 AM

Please fill out your profile. You can do this by using the "control panel" button.
Members may be able to provide better help.
I don't recall this problem being covered, but our archives provide a wealth of info.
Did you do a forum search?

gr J

**Teutone** · 02-12-2008, 09:51 AM

Welcome; Please make sure to read the 'Welcome to the Forum' sticky on top of the W126 page.

benzwag · 02-12-2008, 10:41 AM

orientation doesnt matter. There are 2 temp senders, both the same, and 2 grounds. The pins for the senders and grounds alternate, so no matter how the plug is put on both temp circuits sense the right resistance. Check the manual, I think you will find this specific info, plus the resistances for the temp senders so you can make sure the new one is good.

andytechinc · 02-14-2008, 06:43 AM

Thanks for the orientation info!