Temperature needle problem - M43 engine - E46Fanatics E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 04-05-2013, 07:16 PM   #1
E46-MOTOLING
Registered User
 
Join Date: Apr 2013
Location: Indonesia
Posts: 4
My Ride: 2000 / 318i
Temperature needle problem - M43 engine

Can anybody tell me why the temperature needle rise to a high level when the engine is cold?
When opening the key to on, right up until the temperature needle into the red.
What's the problem with a heat sensor?



Thanks in advance.

Last edited by E46-MOTOLING; 04-05-2013 at 07:18 PM.
E46-MOTOLING is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 04-06-2013, 08:47 PM   #2
E46-MOTOLING
Registered User
 
Join Date: Apr 2013
Location: Indonesia
Posts: 4
My Ride: 2000 / 318i
E46-MOTOLING is offline   Reply With Quote
Old 04-06-2013, 08:57 PM   #3
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
It might be the engine coolant temperature sensor, or the wiring to the sensor. Does it change with the engine running?
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
lszlszx is offline   Reply With Quote
Old 04-06-2013, 11:01 PM   #4
E46-MOTOLING
Registered User
 
Join Date: Apr 2013
Location: Indonesia
Posts: 4
My Ride: 2000 / 318i
Quote:
Originally Posted by lszlszx View Post
It might be the engine coolant temperature sensor, or the wiring to the sensor. Does it change with the engine running?
Is the number 13 is designated temperature sensor is the purpose?
The engine is cold or being on the run, the position of the temperature needle stuck in the red.



*13 Part 13621433076

Last edited by E46-MOTOLING; 04-06-2013 at 11:03 PM.
E46-MOTOLING is offline   Reply With Quote
Old 04-15-2013, 11:55 AM   #5
Iggy27
Registered User
 
Join Date: Nov 2012
Location: Inkom
Posts: 525
My Ride: 2003 330xi
Mine does that too! But my thermostat is stuck open so my engine stays around 70 degrees could that be playing a role? And what is the little cylinder thing that goes into the bottom of the expansion tank? Is that a sensor also? Cause I broke mine in half but do I need it?
Iggy27 is offline   Reply With Quote
Old 04-15-2013, 12:04 PM   #6
NumbaOneNewb
Registered User
 
Join Date: Jul 2012
Location: Portland, OR
Posts: 3,366
My Ride: 2003 330CI Silver
I believe there's also a thermostat in our expansion tank. how did yours broke in half?
__________________
Portland Metro: ECU updates, Euro tune, euro corner delete, air bag light, DSC light, cluster and any led color change, soldering work, transponders for keys, and all custom work related to computer or electronics.DIY AK90 A walk through on coding your mcu and transponders EWS3 How to make your own key (ak90 review)
NumbaOneNewb is offline   Reply With Quote
Old 04-15-2013, 12:05 PM   #7
Iggy27
Registered User
 
Join Date: Nov 2012
Location: Inkom
Posts: 525
My Ride: 2003 330xi
Quote:
Originally Posted by NumbaOneNewb View Post
I believe there's also a thermostat in our expansion tank. how did yours broke in half?
Ha taking out my expansion tank haha and the car had 130000 miles so I think that also played a role in breaking it
Iggy27 is offline   Reply With Quote
Old 04-15-2013, 12:07 PM   #8
Iggy27
Registered User
 
Join Date: Nov 2012
Location: Inkom
Posts: 525
My Ride: 2003 330xi
This thing, do I need to fix it?
Attached Thumbnails
Click image for larger version

Name:	ImageUploadedByBimmerApp1366045621.564398.jpg
Views:	176
Size:	6.4 KB
ID:	500610  

Last edited by Iggy27; 04-16-2013 at 02:31 AM.
Iggy27 is offline   Reply With Quote
Old 12-09-2014, 07:09 AM   #9
mandla24
Registered User
 
Join Date: Dec 2014
Location: Swaziland
Posts: 2
My Ride: BMW
Temp gauge problem

My BMW 318 also has the same problem. How were you able to solve it in your car? Please kindly advise.
mandla24 is offline   Reply With Quote
Old 03-20-2015, 09:47 AM   #10
BMW_E46_DK
Registered User
 
Join Date: Mar 2015
Location: Denmark
Posts: 1
My Ride: BMW E46
Hi,

My E46 did this last month. I have a 316i 1.9 with the M43 engine from year 2000. Here is what I did to solve the problem.
I replaced the temperature sensor (part 13), shown at the picture below:


How to do it:
Remove the air intake.
Remove the throttle housing.
Remove the upper part of the intake manifold.
After removing these parts you are able to remove the temperature sensor water/oil.
It can be a little tricky, but is manageable.

What you need (except a new temperature sensor):
Four new profile-gaskets (number 7 shown below)


At the same time I drained the cooling system and replaced the thermostat housing (as part of the general maintenance of the car).

The repair is not that complicated, and by I believe you can save a lot of money by doing it yourself
BMW_E46_DK is offline   Reply With Quote
Old 03-20-2015, 10:08 AM   #11
mandla24
Registered User
 
Join Date: Dec 2014
Location: Swaziland
Posts: 2
My Ride: BMW
Temperature Needle

Thanks for kindness in taking your precious time to give such a superb explanation. I will order the Engine temperature sensor and will then give you a feedback once I am done with this project

Last edited by mandla24; 03-20-2015 at 10:09 AM.
mandla24 is offline   Reply With Quote
Old 06-16-2017, 11:59 AM   #12
bassman123
Registered User
 
Join Date: Apr 2014
Location: Czech Republic
Posts: 2
My Ride: E46 318i
One little question in this thread

Hi to all, does anybody knows if there is one or two temperature sensor(s)?
One for sending information into engine control unit and second to inform the driver in the cabin, or one for both purposes?
I suppose that there is just one piece of sensor, but I'm not so sure. :-)
Thank you very much.
bassman123 is offline   Reply With Quote
Old 06-16-2017, 03:01 PM   #13
BMW-North
// Quandt AG (Retired) //
 
Join Date: Feb 2008
Location: GTA or Myrtle Beach
Posts: 2,743
My Ride: AMv8,e46x3,e90,e83
Quote:
Originally Posted by bassman123 View Post
Hi to all, does anybody knows if there is one or two temperature sensor(s)?
One for sending information into engine control unit and second to inform the driver in the cabin, or one for both purposes?
I suppose that there is just one piece of sensor, but I'm not so sure. :-)
Thank you very much.
There are more than 2 temperature (sensors) input devices in your e46.

The most common are the CTS - Coolant temperature sensor in the lower rad hose - it primarily feeds the DME (engine computer ) data regarding the coolant temp for the purposes of driving the electric fan.

The ECT Engine Coolant temperature sensor is located in the head near cylinder 4 or 6 (depending on your engine) and sends DME info on coolant temperature for other related functions including thermostat operation.


There are three more less common temp sensors - one for outside ambient air and another for the heater core temperature which IHKA (climate control brain) uses to determine whether it is safe to allow flow and also to activate other functions like AC compressor.

DME uses redundant input to generate output (Actions) having more than one input allows for logic decisions to continue using alternate data.

There is also an oil temperature sensor near the oil filter housing.

Last edited by BMW-North; 06-16-2017 at 04:05 PM.
BMW-North is offline   Reply With Quote
Old 06-16-2017, 03:14 PM   #14
scottjoh
Modded ///Member
 
Join Date: Aug 2008
Location: Torrance, CA
Posts: 2,655
My Ride: '99 323i & '02 540i
Quote:
Originally Posted by bassman123 View Post
Hi to all, does anybody knows if there is one or two temperature sensor(s)?
One for sending information into engine control unit and second to inform the driver in the cabin, or one for both purposes?
I suppose that there is just one piece of sensor, but I'm not so sure. :-)
Thank you very much.
BMW-North is correct as far as I know, but, he didn't touch upon how the engine temp gets to the cluster. The DME sends the coolant temp to the cluster over the CAN bus. If the cluster looses communication with the DME it waits about a second and then the needle goes full hot. When the cluster looses CAN communication with the DME the fuel economy gauge under the RPM will stop working as well.
scottjoh is offline   Reply With Quote
Old 06-16-2017, 03:52 PM   #15
BMW-North
// Quandt AG (Retired) //
 
Join Date: Feb 2008
Location: GTA or Myrtle Beach
Posts: 2,743
My Ride: AMv8,e46x3,e90,e83
Good follow up Scott - that's important data for diagnosing.

Edit: I should have also clarified that the cluster input is from the ECT (item #13) in one of the above diagrams in post #10.

Last edited by BMW-North; 06-16-2017 at 03:55 PM.
BMW-North is offline   Reply With Quote
Old 06-16-2017, 04:00 PM   #16
bassman123
Registered User
 
Join Date: Apr 2014
Location: Czech Republic
Posts: 2
My Ride: E46 318i
Yes, that's correct and I know about them. Sorry, I wasn't exact enough with my question. I drive bmw e46 318i with m43 engine - 4 cylinders.
In few days I will recieve 2 new sensors for replacement the old ones. One of them is CTS for fan control and it is clear for me how to make this job with this one.
But second one is no. 13 almost the same as on the picture above - link for my engine:
http://www.realoem.com/bmw/en/showpa...diagId=11_2054
P.N. 13621433076
And I've been told, that there is possibility, that this kind of sensor could appear twice. One for the control unit and one for needle.
Simply said - If this is true, I would like to find out which one is for control unit purposes before I start my work.
But for me it looks like there is just one ECT Engine Coolant temperature sensor and that its possition is in the level between 3rd and 4th cylinder.
http://aswr-partsimages.s3.amazonaws...8521bb6d68.jpg
So please, can you confirm that it is one piece, not two of them?
Thank you in advance.
Martin
bassman123 is offline   Reply With Quote
Old 06-17-2017, 06:42 AM   #17
markusmarkus
Registered User
 
Join Date: Jul 2008
Location: USA
Posts: 6,171
My Ride: 2001 330Ci
The DME controls the temperature gauge. Why? It's part of the BMW "wussification" process (/s). Actually, BMW did this so that unknowledgeable customers don't complain to the dealer that the temperature gauge is acting "funny." Basically, the temperature gauge needle will remain in the 12 o'clock position as long as the engine coolant temperature (as sensed by part #13) remains in a factory specified range.

Google "BMW E46 hidden obc functions." Test #7 will show you the coolant temperature in centigrade degrees as seen by the DME.
markusmarkus is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON





All times are GMT -5. The time now is 08:20 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - VerticalScope Inc. All rights reserved.