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Re: Temperature sensor accuracy?
Ok, while I didn't get the ice water, etc out to check the temp sensor, I did check it over the last few mornings before starting the car (after ~12+ hours at rest, and well and truly at "ambient" ) - it's pretty much spot on compared to my weather station.
So as a few people have suggested: any high reading is probably due to a lack of airflow over the sensor, and the resulting radiant heat from the engine. In other words, it's only going to be accurate when the car's moving.
The service manual describes the algorithm the controller uses (linked below) - apparently the car makes all kinds of limits on the rate of change according to car speed. Who'd have though such an apparently simple thing could be so complicated.
 
Cronauer : "Hey, uh, hi, can you help me, what's your name? "My name's Roosevelt E. Roosevelt." Roosevelt, what town are you stationed in? "I'm stationed in Poontang." Well, thank you, Roosevelt. What's the weather like out there? "It's hot. Damn hot! Real hat! Hottest things is my shorts. I could cook things in it. A little crotch pot cooking." Well, can you tell me what it feels like? "Fool, it's hot! I told you again! Were you born on the sun? It's damn hot! I saw... It's so damn hot, I saw little guys, their orange robes burst into flames. It's that hot! Do you know what I'm talking about?" What do you think it's going to be like tonight? "It's gonna be hot and wet! That's nice if you're with a lady, but it ain't no good if you're in the jungle."
---
X-Trail 2003 ST II
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4/Feb/2006, 11:32 pm
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Re: Temperature sensor accuracy?
Hi Guys,
Roger (Canadas FarEast) has relocated his temp. sensor recently and will soon be reporting the accuracy of the temp readings so you can do the same 
Roger: Over to you mate to post a DIY on this when you have time.
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6/Aug/2006, 11:31 am
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Canadas FarEast
BANNED USER
Date Registered: 10-2005
Location: Newfoundland Canada
TOTAL POSTS: 395
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Re: Temperature sensor accuracy?
quote:
jalalski wrote:
Hi Guys,
Roger (Canadas FarEast) has relocated his temp. sensor recently and will soon be reporting the accuracy of the temp readings so you can do the same
Roger: Over to you mate to post a DIY on this when you have time.
Jalal:
My pleasure.
Decided to do a quick (and somewhat short) re-location of the temperature sensor. Will assess this new location for a few days to see if the readings improve any (more accurate). If affirmative, will consider moving it even further from the radiator, hopefully for even better results.
Took a few pics, for the benefit of others.
Here’s the sensor, in it’s original location.
Fairly easy to remove – has the same type of connector as used on the white prop rod holder – has to be released from behind.
There’s enough wiring on it for a short move, without disturbing anything. However, there are just a few ties holding it in place and, with those released, it could be moved considerably further (away from the rad).
For now, I just placed it in the grill opening, where it fits quite nicely. It’s not very visible (it’s black) even in the open grill area.
As you may know, I have the CloudRider grill screens. With these re-installed, it’s completely hidden.
As I said, I’ll assess for any improvement (or otherwise) and will report on findings.
Cheers = Roger
I posted the above on another forum last week. Below is an update that I made the next day. Jalal is correct - the improvement was immediately noticable.
Just about every day I pass 3 outdoor thermometers, in different parts of the city. They tend to vary from one another by 1 to 5 degrees.
My sensor had been showing differences of 5 to 12 degrees in excess of these 3.
On just one trip today, the variance was only 1 to 3 degrees.
Seems like the move of the sensor may have helped. However, it was somewhat overcast here today and the temp was below 20 c. I'll await some warmer temps before passing final judgement.....
Will follow-up after the weekend.
Cheers = Roger
My findings today show a variance of between only 1 and 2 degrees. I may not even need to relocate it further from the rad - - - however, just for curiosity, I might have a go at it....
Cheers to all = Roger
--- Roger
X 228
2006 X-T Bonavista Edition
Production Number 0001
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6/Aug/2006, 12:04 pm
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Re: Temperature sensor accuracy?
Hi Guys,
The T31 xtrail temp. sensor is also located at the front just near the bonnet locking mechanism, so I believe the accuracy of the temp. reading would also be questionable, depending on the driving conditions and is best relocated as per the T30 method described by Roger above.
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24/Apr/2008, 7:22 pm
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Re: Temperature sensor accuracy?
quote:
Dunoon wrote:
I have a 2002 Ti with Climate control.
I believe that the outside ambient temperature readings for my vehicle are pretty accurate going on what the known temperatures are for the area and my thermometer at home. Regarding lower temperatures I have seen my ambient reading as low as minus 3 near Blayney one frosty night.
However, I have found that it takes about 3 km travel for the reading to settle after the car has been stationary. Another thing we need to remember is that the temperature taken over bitumen or conrete will differ to the temperature taken over say grass or under a shady tree.
But I do have a concern about the regulation of the temperature on the climate control and I often feel that the temperature in the car is not being maintained at the temperature that I have set. There must be another component/sensor that regulates that. (Sometimes I think I should treat the readings set just as a number on a scale rather than actual temperatures!)
Does anyone have any advice or experience with this issue?
Yes, the climate control looks at more than just the ambient sensor, Its primary sensor is the cabin temp sensor, secondary is the blower intake sensor, then it references the outside temp sensor and sunload sensor to complete its calculations. All of the cabin sensors can & do accumulate dust and this can effect there sensitivity. try cleaning these with a air blower and seeing if this improves the climate temp set point. The component layout is shown on page ATC35 in the workshop manual.
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2007 TI/L X-Trail T30
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26/Apr/2008, 10:14 am
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Re: Temperature sensor accuracy?
so we are have all these crazy readings... so where would be a good spot to move this sensor.... I have an 2005 X-trail and I would have a more accurate reading if I knew where a good spot would be. Thanks
--- Michael
X-1400
2005 SE Red,Auto, 2.5l, Cosmo Racing CAI, AlphaMirror Auto-Dimming Mirror, RedlineTuning Gas Hood Struts, Rear Brake Decal, Modified Centre Armrest
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17/Sep/2009, 10:09 am
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Re: Temperature sensor accuracy?
If you read your countryman's post above, you will get an idea as to where to move it and it seems to bring good results in Canada when moved there behind the grille.
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17/Sep/2009, 10:27 am
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