Ecu Temperature Position

[gavbrum 18 1 Cars]

Having trawled through the forums to find out where the ECU Temp sensor is on my 1993 1.9 GTi, I am still a bit confused and I am needing some info.

 

I know I'm looking for a blue connector and it could be in 3 different positions around the engine. As far as I understand the most likely position is at the back of the block facing away from the engine, behind the SAD connector beside the distributer.

 

Problem is this. Its seems like the most likely candidate is a green connector.

 

http://s1061.beta.photobucket.com/user/gavbrum/media/272A794D-9D3C-48D3-A07D-137F665CDD0A-997-000000406B3B64B4.jpg.html

 

http://s1061.beta.photobucket.com/user/gavbrum/media/176A49FE-FD83-42C1-BEE3-B369E33F6877-997-0000004065F81B64.jpg.html

 

And I have also found this flapping about. Is this the guy or for something else?

 

http://s1061.beta.photobucket.com/user/gavbrum/media/4F6E4256-B574-47DC-8038-D6E5261A5D75-997-000000406F823A5A.jpg.html

 

So I'm a bit confused.

 

Also the replacement ECU Temp sensor I bought doesn't seem to fit connectors anyway. Part No 1920C5. Bought off neat autos on eBay.

 

http://s1061.beta.photobucket.com/user/gavbrum/media/0EF2F12D-CE04-4835-969A-31DE608CE0B2-997-00000042A896A197.jpg.html?sort=3&o=0

 

http://s1061.beta.photobucket.com/user/gavbrum/media/2E0F3814-821E-43C7-A6C6-B6F92E714823-997-00000042A567167E.jpg.html?sort=3&o=1

 

Bought it as a result of this thread

 

http://forum.205gtidrivers.com/index.php?showtopic=70390

 

Any help would be greatly appreciated.

 

Cheers,

 

Gav

 

 

[Anthony 1,003]

What you've bought is an air temp sensor by the looks of things.

 

The ECU coolant temp sensor is, as you've located, on the back of the 'stat housing.

 

Normally it's blue, but later 306/406 ones were green so one of them might have been retrofitted.

 

Again, normally the plug should be blue and looks exactly like you've pictured, and there isn't normally a green plug on the engine management loom - so I'm a little confused where/what that is, unless it's a replacement for the blue one (in which case, why is that still present) or the very late Motronic cars were different?

 

Quick way of telling is to unplug the temp sensor and try to start the engine - with it unplugged, it either won't start or will run very roughly normally.

[gavbrum 18 1 Cars]

The car is starting roughly which is why I'm (trying to) changing the temp sensor so removing the connector might not tell me too much. (will try anyway).

 

It's starting terrible in the cold, got to keep revving it for a few mins to get some temperature in it before it'll idle properly, if not it just splutters and dies otherwise and then its a nightmare to try and restart.

 

Cheers,

 

Gav

[Anthony 1,003]

Actually, thinking about it as you've got Motronic that test might not work so ignore that - Motronic will probably just assume a fail-safe temperature and carry on working.

[gavbrum 18 1 Cars]

Any idea of the correct part number for the ECU sensor?

[Anthony 1,003]

From what I can see on Servicebox, it's 024246 - quite expensive from Peugeot though at £32.20 inc VAT when it's typically less than half that from a motor factor.

 

Easy enough to check your one is giving sensible looking readings if you've got a multimeter? The resistance changes with temperature.

 

 

You're looking for around 6000 ohms at freezing, 2500 ohms at 20 degrees, and 350 ohms at running temperature (80-90 degrees)

[gavbrum 18 1 Cars]

Steep as per from pug.

 

I'll shop around I think.

[Anthony 1,003]

The same Bosch part is used on many European fuel injected cars throughout the 80's and early 90's so it's very common.

 

Edit - just looked it up and it's Bosch part number 0 280 130 026 which should make one easy to find

Edited December 18, 2012 by Anthony

[gavbrum 18 1 Cars]

http://s1061.beta.photobucket.com/user/gavbrum/media/ScreenShot2012-12-18at163800_zps3298058f.png.html

 

Just found this as well

 

Was about to ask if this was the right one.

[gavbrum 18 1 Cars]

Got one from my local motor factors for £12

 

It's gonna be a bitch to change though. Any tips?

 

Might need to buy a longer socket.

[Anthony 1,003]

Easy enough to swap by reaching over the back of the engine from above, and using a deep reach socket (19mm IIRC).

 

If you're quick, you can swap it without draining the cooling system too - coolant will come out when you remove the sensor (unsurprisingly) but just pop the new one in there quickly and tighten it and you'll only lose a small amount. If speed isn't your forte, best part draining the system so you don't make a mess.

[gavbrum 18 1 Cars]

If anyone has any ideas about this extra blue plug that's flapping about I'm all ears.

[welshpug 1,677]

stick your finger in the hole whilst you get the other one ready to go in.

 

Check the wire numbers.

 

if all else fails, unplug the ecu and see which pin it buzzes through to with a multimeter, I would do the same with the green plug because as Anthony mentioned the green plug and sensor is usually only found on later vehicles, and the blue one pictured is usually the ecu temperature sender.

[gavbrum 18 1 Cars]

My car is a '93 so I would assume it falls under the category of later vehicle.

 

I'll test pins anyway.

 

Cheers fellas

[pug_ham 245 3 Cars]

My car is a '93 so I would assume it falls under the category of later vehicle.

By later vehicles, I think we mean 306's etc made after 1996 (phase 2 especially), the only green connector you might find in the engine bay on a motronic car is the diagnostic socket afaik.

 

A few minutes with a multimeter should find you the correct pug for it but if the wrong one is connected, I'd expect your emissions to be way out also.

 

The blue plug you've pictured is most likely imo, especially with the broken edge to the connector.

 

g

[gavbrum 18 1 Cars]

So, I pulled the green plug out of the ECU sensor, as pug_ham suggested it was probably the diagnostic socket and popped the blue one in. Tried to start it. Started but died. Adjusted the air mixture screw and tried again. Boom! Started and stayed started. After a little more adjustment it is now idling perfectly at 1000rpm and starting first time.

 

Obviously during the rebuild my mechanic (TWAT) I was using just plugged green to green. The sensor must be for another motor but compatible part. Must have been replaced at some point anyway as I don't think it will be from new fitted by pug themselves, although being a Frenchie it wouldn't surprise me.

 

Anyway I got my Christmas wish! A working Pug. Thanks everybody!

[welshpug 1,677]

The later green sender has the same resistance range as the blue one, bosch and jaeger the two makers iirc.

 

The later blue plug is used for coolant temp gauge/warning light combined unit, p2 405, s16, gti6, ph1 xsara etc.