E46Fanatics

E46Fanatics (http://forum.e46fanatics.com/index.php)
-   ///M3 Forum (http://forum.e46fanatics.com/forumdisplay.php?f=65)
-   -   Need help troubleshooting thermostat error (http://forum.e46fanatics.com/showthread.php?t=948751)

40mikemike 10-04-2012 11:12 PM

Need help troubleshooting thermostat error
 
Hey Guys,
New M3 owner here. When I took the car in for the pre-sale inspection, the DME threw (105) 69 Engine Temperature Signal Implausible (1x; Not
Present). I was told by the tech there that the thermostat needs to be replaced.
I took possession of the car today and even after driving 30 miles on the freeway, the temperature gauge needle stayed pegged in the middle. No sign of over-heating, is that possible with a stat failure:hmm:
What do you guys think could be the problem? Any ideas on troubleshooting this?

illestminimike 10-04-2012 11:58 PM

Seems like it would be the actual temp sensor.

turbo_f22_pilot 10-05-2012 03:46 AM

As stated in the other forum;

The thermostat is designed to fail open. Not like domestic vehicles that fail closed. Your thermostat probably isn't the issue. There are 2 temp sensors that might be causing the issue. Check the connectors. Your error means it sees the temp as completely out of range when compared to the rest of the data that it's processing.

BWOODM3 10-05-2012 09:20 PM

Where are these sensors located?

///MPR77 10-05-2012 09:30 PM

1 Attachment(s)
Check out menu 7 after unlocking OBC.

SolidJake has a great thread where everyone is checking in with their engine temp.
*Edit I couldnt find that thread.

My operating temp with new cooling system hangs around
88-95C


Your tstat sounds like its broken open.

A pic of my old t stat.
Attachment 472727

40mikemike 10-07-2012 07:34 PM

I got a chance to get into the OBC menu and take the car for a closed circuit test. This is what I found.

External temp: 75F

First leg: 15 miles with AC ON
Freeway, constant 80 mph, 3k rpm
Coolant temp: started from 80C(the engine was already warm when starting) and reached a constant 86C(needle at 12 o'clock)

Second leg: 15 miles with AC OFF
Freeway, constant 75 mph, 3k rpm
Coolant temp: went from 86C to constant 83C

Third leg: 6 miles with AC OFF
Semi-surface street, constant 60 mph
Coolant temp: went from 83C to constant 80C(needle a minute or two to the left of 12 o'clock)

What do you guys make of this temp range? Do you think my engine is running cold? Is yes, it does look like its the stat does'nt it.

///MPR77 10-07-2012 07:56 PM

Yep seems a bit cool.

Beamer Creamer 10-07-2012 07:56 PM

Temps all seem good to me. With a/c on they should go up and mine usually always runs dead center but tstat seems to be working if it changes temps up and down. Try running it with heater full blast and record numbers

BWOODM3 10-07-2012 11:10 PM

I thought I read somewhere on here about there being a DME update on engine running temps.

40mikemike 10-08-2012 11:07 PM

2 mile drive from work, heater at full blast, external temp 65F, coolant temp max was 83C
Also looking at this thread it looks like my cooling system is OK
http://www.e46fanatics.com/forum/sho...d.php?t=912749

Can I just clear the error code and forget about it? Do you guys know how to DIY clear the error?
Thanks for all your input.

Beamer Creamer 10-09-2012 09:35 AM

Quote:

Originally Posted by 40mikemike (Post 14798403)
2 mile drive from work, heater at full blast, external temp 65F, coolant temp max was 83C
Also looking at this thread it looks like my cooling system is OK
http://www.e46fanatics.com/forum/sho...d.php?t=912749

Can I just clear the error code and forget about it? Do you guys know how to DIY clear the error?
Thanks for all your input.

I just looked over thread again. Doesnt seem like sensor cuz your temp guage is so near normal and dont think tstat cause car prob wouldnt get to normal temp on guage if open tstat.Should be able to use just about any obd2 scan tool to erase. Try take car for a good drive before you think its good for sure. Keep it revved around 4000 rpm in first or second so it doesnt get much wind( disconnect fan) see that tstat is opening or if it gets too hot. Could use laser temp gun on rad. Just some more tests if you want. Sounds good to me but just watch the guage and erase is prob good

40mikemike 10-09-2012 10:55 PM

Im getting a bluetooth OBD2 scanner so I can keep an eye on the vitals. Will continue monitoring and report back.
Thanks BC and all.


All times are GMT -5. The time now is 07:12 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use