andytaxi

i have had a new ecu fitted to my 1994 C200 and my coolant gauge has stopped working could this be related to the new ecu

Plutoe

Not really!

andytaxi

hi pal after changing the coolant sensor, i traced the wire back and it goes into a tapped loom that seams to end at the ecu, i didnt try to trace any more as its a new ecu and didnt want to risk damage

MJ50

moved to W202 forum...

Russell Ormerod

There are a few variants. What does your sensor look like? 4 pin? 2 pin?
If there is a single pin sensor with a green wire... that will be a direct connection to dash and has nothing to do with engine ecu.

andytaxi

cheers for that haynes manual says the same but after speaking to an AA man on his tablet it showed it going to ecu. and yep single conector and green wire

Russell Ormerod

No way! Single pin sensor with green wire goes via x26/25 next to abs pump at lf fender and into body harness straight to cluster. There will be another sensor with a green/red and a brown/white that goes to engine ecu.

andytaxi

yep 2 sensors wires run into conduit to bottom of inlet manifold then go with what looks like tapped wires that come from the coil packs ,after removing washer bottle they all seam to end there, but didnt look passed there after paying for the ecu ££££s

Russell Ormerod

Just ground the single pin green wire at the front of cyl head. With ign on the temp gauge should rise to max

andytaxi

cheers for that, spent 3 hours this morn unwrapping the loom as far as the connector next the abs unit, which i thought may be the problem stripped cleaned and wd40, fitted all back and no result, so will try earthing the wire poss tomos as knakard in this heat

andytaxi

hi russ tried that this evening and nothing happened, i take it that means a break in the wire

andytaxi

sorted, i think temp gauge was not broke ,mot found brakes lights out, and found fuse had blowen changed fuse and temp sensor now works, it is also fuse for part of the dash pod, wich i persume contained the temp bit

Russell Ormerod

Ok that's good