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Coolant Temperature Sensor


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#61 zigouala

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Posted 19 April 2010 - 03:08 PM

1.On all models a single electric cooling fan is fitted mounted in a shroud located between the
front bumper and the radiator, or between the bumper and air conditioning condenser as applicable.
2. On vehicles without a/c, the fan is a single speed on petrol engine models and two speed on diesel engine models.
On vehicles with a/c, initially a two speed fan was used for petrol engine models and three speed fan for diesel engine models.
From the 2001 model year, all models equipped with air conditioning were fitted with a three speed fan.
3.On all except early 1.6 litre petrol engine models, the operation of the cooling fan is controlled by the engine management ECU
(and air conditioning system control unit, where applicable) using coolant temperature information supplied by a coolant sensor
mounted in the coolant outlet housing. On early 1.6 litre petrol engine models, a separate thermal switch, mounted in the cylinder head was used to control
the fan. From 2001 model year this arrangement was replaced by engine management ECU control, in line with all other models.
From Haynes Service and repair manual.

In my opinion anyone having this problem must check the fan proper operation, fan speed control resistor and coolant temperature sensor.

#62 Miller

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Posted 25 April 2010 - 01:07 PM

Hi all,

Can anyone help, i have a 2000 (X) Citroen Xsara Picasso, 1.6, without aircon.

The Problem -

The engine was sat idling for about 10 minutes. Then the display said 'Stop Engine Temperature' and it was beeping. The temp display on the dashboard was up to max. I stopped the engine and there was a slight burning smell from the engine bay.

What I Have Done -

Checked the fan operation, it was seized (hence the smell). Replaced the fan. No different from before, as soon as the ignition is turned, the display beeps and says 'Stop Engine temperature' with the temp gauge at max. The fan is running all the time.

Checked the coolant tempereture sensor (blue sensor), 4.9v to the sensor. It had a resistance of around 2.2 kohms. Started the engine and the resistance dropped slowly.

Checked the engine temperature fan switch (blue sensor). It is always in an open circuit state. It was receiving 2v (from the temp sensor).

Checked the ECU double relay (this is bolted to the side of the ECU). I put 12v to each of the coils to force a switch and both are pulling in fine.

It seems that everything i have checked is working fine.

Does anyone have any ideas, any help is much appreciated.

Thanks.

#63 whasaah

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Posted 11 May 2010 - 06:36 PM

Well encountered this problem myself own a Xsara Picassso 2.0HDI 2001, engine temp stop warning, checked the water expansion tank but it was fine water at max level, checked radiator fan and it was working,
After searching this great forum lo and behold the coolant temperature sensor was a know culprit so I replaced it, easy job to do, £17 with new gasket from citroen dealer, no sign of the dreaded warning so far looks like that's fixed it. Also noticed when it was playing up that the temp gauge was zero even when car was well warmed up and then it shot to max and the Engine Temperature Stop warning came up.

Hope my experience can help others, too many sensors and electronics on Diesels these days!! :angry: Ah gone are the days of the basic diesel, mechanical injectors, no sensors, no egr's; thanks to the green squad, engine stopped working hit it with hammer and away you'd go lol

#64 andrewkirsanow

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Posted 13 May 2010 - 06:51 PM

Hi, I'm new here and I'm sorry to post here it it's wrong, but I can't find any way to create a new thread.

My problem seems to be coolant sustem related though, I have just bought (today) a '52 2.0 HDI Picasso which seemed OK, but then I've never driven one at all. I've just realised that the light at the bottom of the coolant temperature sensor is Red/Orange all the time, but the book I got with the car says it shouldn't be on, and the picture in the book makes it look blue. Also, the temperature gauge never gets above 2 bars. There are no warning beeps, or messages on the display. The owners manual says that light means that the engine is too hot, (which it isn't as the light is on when cold) or the engine oil is low (which it isn't as the car has just been serviced and the oil is up to the MAX mark on the dip).

I just wondered if anybody knows why this light is on at all, the dealer wants £50 to diagnose, and the garage I bought it from is a Toyota dealer so may not be fully in the know when it comes to picassos.

The only other thing is that the car seems a bit sluggish, but I've just traded in a Focus TDI which was quite nippy so I don't know if you can compare the 2.

#65 Charliee

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Posted 19 May 2010 - 08:24 AM

Hi, I'm new here and I'm sorry to post here it it's wrong, but I can't find any way to create a new thread.

My problem seems to be coolant sustem related though, I have just bought (today) a '52 2.0 HDI Picasso which seemed OK, but then I've never driven one at all. I've just realised that the light at the bottom of the coolant temperature sensor is Red/Orange all the time, but the book I got with the car says it shouldn't be on, and the picture in the book makes it look blue. Also, the temperature gauge never gets above 2 bars. There are no warning beeps, or messages on the display. The owners manual says that light means that the engine is too hot, (which it isn't as the light is on when cold) or the engine oil is low (which it isn't as the car has just been serviced and the oil is up to the MAX mark on the dip).

I just wondered if anybody knows why this light is on at all, the dealer wants £50 to diagnose, and the garage I bought it from is a Toyota dealer so may not be fully in the know when it comes to picassos.

The only other thing is that the car seems a bit sluggish, but I've just traded in a Focus TDI which was quite nippy so I don't know if you can compare the 2.

Orange light and 2 bars is exactly as it should be. Later cars were recalibrated to read 3 bars I understand, but for yours, 2 is right. Once you've replied to a few posts you will be able to post new topic yourself.

#66 John S C

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Posted 19 October 2010 - 07:00 AM

Hi there,

I've got a 2000 HDi. About two years ago now - yes two years ago! Travelling back from Eurodisney, the air conditioning packed up. Immediately the engine temperature warning light preceded to flash and beep sending me into panic mode. However, the engine temperature was fine (unlike the temperature inside the car!)

Anyway, the car has been into our local citreon specialist twice now.. with not joy as a result??? The darn thing still bleeps and flashes continually! However, it only bleeps and flashes when the fan is on. i.e. when the air conditioning is on, and when the engine actually needs to be cooled.

It is really really annoying! I will take out the temperature sensor, which I presume from reading above is underneath the air filter housing... do I need to then disconnect the battery for a period before re-connecting it all???

Any advice of guidance wouldbe very much appreciated. We have done 30,000 miles with it beeping, however I would like to be able to turn the music down to below 90 decibels!!!

Many thanks :)

#67 cookie400

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Posted 20 October 2010 - 02:20 PM

Hi New to this forum... (great one it is too!) I own a 03 plate pic 2.0 Hdi and I have the dreaded temp stop engine warning coming on. It is very intermitant though! I have also noticed that the temp guage has a complete mind of its own, showing cold when your doing 70 on the motorway and hot when its only been running 10 seconds! I know there is nothing wrong with the actual cooling system (no leaks etc) so from reading on here I need to replace the coolant sensor. My question is where is this sensor located? Reading through previous posts there seems to be confusion as to what sensor does what? Plus on these cold mornings it is difficult to start, but am putting that down to the poor old ecu not having a clue what temp the engine is so under fuelling the engine???? (hope so anyway!)

Thanx in advance.....

#68 cookie400

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Posted 21 October 2010 - 04:28 PM

ITS FIXED!!!!!

Found the sensor, top right hand side of engine, green two pin. After buying another one (£12.98 from citroen)and freezing my fingers off trying to fit the thing it didnt seem to work... tried juggling some wires about but still kept getting the message on dash board. So decided to take apart the plug itself, (note: it damages easily) and squeeze together the two connectors. put it back together and hey presto! its ok! I didnt need to disconnect the battery or reset anything, car is fine now. :rolleyes:

Am off for a well deserved drink or two now! :cheers:

#69 rays1954

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Posted 15 November 2010 - 07:43 AM

hi ,i have a picasso 2002 2.0 hdi ,it has this over heating problem the fan runs when i put the air con on , this flashes any time even when ive just start it and am going a long [after a few minutes ] ,is it a relay problem or a sensor fault .thanks ray.

#70 martyn404

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Posted 27 November 2010 - 05:26 PM

I have an X reg Picasso registered in Feb 2001and I too am having problems with the "Engine turn off message" but the cooling fan runs constantly, there is no way the engine is over heating, the fan comes on just after I have turned on the ignition.
I have had the 2 sender units replaced and checked for broken wires and poor connections. Still no luck with it at all

Does the system need to be reset and how?
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#71 martyn404

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Posted 27 November 2010 - 05:34 PM

Hi all,

Can anyone help, i have a 2000 (X) Citroen Xsara Picasso, 1.6, without aircon.

The Problem -

The engine was sat idling for about 10 minutes. Then the display said 'Stop Engine Temperature' and it was beeping. The temp display on the dashboard was up to max. I stopped the engine and there was a slight burning smell from the engine bay.

What I Have Done -

Checked the fan operation, it was seized (hence the smell). Replaced the fan. No different from before, as soon as the ignition is turned, the display beeps and says 'Stop Engine temperature' with the temp gauge at max. The fan is running all the time.

Checked the coolant tempereture sensor (blue sensor), 4.9v to the sensor. It had a resistance of around 2.2 kohms. Started the engine and the resistance dropped slowly.

Checked the engine temperature fan switch (blue sensor). It is always in an open circuit state. It was receiving 2v (from the temp sensor).

Checked the ECU double relay (this is bolted to the side of the ECU). I put 12v to each of the coils to force a switch and both are pulling in fine.

It seems that everything i have checked is working fine.

Does anyone have any ideas, any help is much appreciated.

Thanks.


It seems we both have the same problem. I notice your thread is from April this year, can I ask if and how you resolved your problem..
The fan on my car runs constantly and turn off engine message and beeps permanently on display on dashboard. I replaced both sender units and checked for poor and faulty connections. Does the system need to be reset? If so then how? Already spent fifty quid on sensors, is this problem going to be a long protracted and costly affair?
can email me direct martyn404@gmail.com. Not sure if this site sends email notifications of replys..
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#72 martyn404

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Posted 28 November 2010 - 11:49 AM

It seems things just have to get worse!
When I was out tinkering with the cooling system sensors yesterday and the fan was constantly kicking in on a cold engine and I have drained the battery. So at this minute it's on charge and I have made no progress in eliminating the dreaded switch off engine alarm. I have dismantled the switch connectors and put new wires into them ( took ages) I cleaned all the connections and refitted them.. No luck whatsoever. I have learned to unplug the fan from the fuse box. In this weather the fan doesn't need to kick in at all when the car is on the move. I am at a complete loss on this problem, it's looking like a visit to an auto electrician.
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#73 martyn404

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Posted 28 November 2010 - 01:38 PM

Well at least I've got the battery charged and the car going.. Now back to that infernal switch off engine alarm
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#74 deano2106

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Posted 28 November 2010 - 06:54 PM

Hi All i'm new here and can't yet upload my own threads so i'll put my query here as its a simular problem.

Just latley the engine temperature sensor has been naughty!! It's a 1.6 petrol engine and up until around a week ago the cars temperature used to get upto 3 bars and stay there regardless of outside temperature or how much the engine is been laboured.

About a week ago i noticed that it was taking ages for anything to register on the temperature gauge on the dash, e.g: 5 days ago i needed to make a trip of around 40 miles and it was a very cold morning so i started the car 10 minutes before setting off to 'warm the engine up'. after 10 minutes i set off and it wasn't until i had done about 20 miles until 1 bar came up (bearing in mind i was doing 70mph on the motorway for about 12 mile prior to the 1st bar showing)!!

Today i used the motorway again and it was the same story again, but a second bar popped up for about 30 seconds and then it went back just 1 bar.
I also think the heating temperature isn't as hot as it could be (although we are having a really cold spell at the mo).

I suspect that this is some kind of sensor problem but does anyone have any suggestions before i start dismantling the car??

I look foreward to speaking to you guyz!!

#75 Lancelot

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Posted 28 November 2010 - 07:44 PM

More likely the engine water thermostat is up the duff as you are not getting any decent heating. If it was the sensor that was faulty the heating wouldn't be affected, you'd still get hot air after that mileage.

Edited by Lancelot, 28 November 2010 - 07:45 PM.

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#76 deano2106

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Posted 28 November 2010 - 08:25 PM

More likely the engine water thermostat is up the duff as you are not getting any decent heating. If it was the sensor that was faulty the heating wouldn't be affected, you'd still get hot air after that mileage.


Thanks for that, i've been looking into it further over the last few hours...i learned it could be the thermostat stuck in the open position.... Does this sound on the right lines to you?

Also where is the thermostat located and is it DIY'able to replace??

Cheers

#77 martyn404

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Posted 29 November 2010 - 10:42 PM

Well it's minus eight outdoors tonight and I hope the princess will fire up in the morning, she has an important appointment tomorrow.. With an auto electrician.. This auto electrician guy has been recommended to me and is supposed to be hot with the wires... We'll see!!!
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#78 martyn404

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Posted 30 November 2010 - 12:48 PM

No luck with the auto electrician this morning. This is a very local garage to me, within 20mins walking distance of our house.
I didn't even leave the car with them, I drove it back home! The garage's customer services left much to be desired and needs to be improved. I got there this morning at 10.30 as per arrangement by phone. The guy was having his breakfast and so, being polite, I said I'd wait outside..... 20 minutes later his wife comes out to me and says he won't be long he's just ordering some parts.. I saw red, he know's I was waiting in the freezing cold outside and then can't be bothered to deal with me and is ordering parts for someone else.. How Rude!


When I got back home and thawed out I had a flick through the Yellow Pages and found this specialist Simon-Dean garage Their website looks ok and I booked the car in ( very nice receptionist.) for Thursday morning.. The downside is that they charge £45.00 per hour.. I wan't the job done properly and I'm tired of being messed about.. No more cowboys I hope..
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#79 TomL

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Posted 30 November 2010 - 10:16 PM

Hi Folks,

I'm new to the site and for whatever reason can't start a new topic, so will post here. I'm having a problem with my steering being unusually heavy. I took the car to a mechanic and he said I don't need to worry about the power steering pump as it's fine. What could possibly be the problem? Thanks in advance.

--Tom

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#80 martyn404

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Posted 02 December 2010 - 06:21 PM

I dropped our Picasso off at Simon-Dean Motor services.LTD this morning! I gave them my details and all the necessary and relevant info, the receptionist lady was very polite and helpful. It was going to cost £47.00 for a full diagnosis and £45.00 per hour for any subsequent labour. After the initial diagnosis Simon-Dean Motor services.LTD gave us a call to say that the ECU was at fault as the coolant sender units and wiring were ok. We already have an initial bill for £200.00 for the diagnosis and labour and we were told that the ECU would cost £400 and will not arrive until Tuesday next week. Simon-Dean Motor Services. LTD kept us informed with phone calls at all stages of the investigation! I gave the go ahead for the replacement ECU as we need our car, I have borrowed my mums for the time being!
We have already paid out £50.00 to a back street garage for sender units that were not needed


We can expect a bill in excess of £600.00 on Tuesday..
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