Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Fluid Motor Union
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-10-2020, 10:59 AM
Member
 
Join Date: Feb 2010
Location: Chicago
Posts: 189
turquise1 is on a distinguished road
Keep burning TCMs..

Hey guys,


I did some transmission valvebody replacement job recently and now I keep frying TCMs!. Basically there is no crank and no start. Also, there is no gear display in instrument cluster. I have already replaced one TCM and car was back to normal for a week and then I burned another one with same symptoms.


I have checked all the fuses including the ones inside the DME box (all 30 Amps) and they are all good. Thinking about the process, I remember the Oil level sensor (at the bottom attached to pan) cables were slightly in bad shape but wouldn't that suppose to blow a fuse instead (From what I am reading Fuse 5 related to oil level sensor and TCM?) of keep burning the modules?


I have another TCM that I can put on but I am worried that would be also dead quickly..


Thoughts?.


Thanks,


Ozzie
__________________
X5 4.4 01
Reply With Quote

Sponsored Links

  #2  
Old 02-10-2020, 12:54 PM
EODguy's Avatar
Member
 
Join Date: Jun 2018
Location: Saudi Arabia/Philippines/USA
Posts: 1,038
EODguy is on a distinguished road
On the off chance that you're my long lost brother...

How is your classification resistor?

Just my WAG but I had "issues" before...

With the resistor I mean

Sent from my SM-A730F using Tapatalk
__________________
"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course
Reply With Quote
  #3  
Old 02-10-2020, 04:15 PM
Member
 
Join Date: Feb 2010
Location: Chicago
Posts: 189
turquise1 is on a distinguished road
Quote:
Originally Posted by EODguy View Post
On the off chance that you're my long lost brother...

How is your classification resistor?

Just my WAG but I had "issues" before...

With the resistor I mean

Correction : I replaced the TCM with another one and still had the same issue so it is not a broken TCM module. There are no related transmission errors but when I read the gears with INPA I only see gear 4 and nothing changes as I shift thru gears. No gear display in instrument cluster.



Any other ideas?


Thanks,


Ozzie
__________________
X5 4.4 01
Reply With Quote
  #4  
Old 02-10-2020, 06:43 PM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 5,326
andrewwynn is on a distinguished road
When the heat doesnít show properly itís usually the connection on the back of the transmission full of rusty water. It can also be the cable harness itself or the actual selector switch.
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
  #5  
Old 02-10-2020, 07:54 PM
Member
 
Join Date: Feb 2010
Location: Chicago
Posts: 189
turquise1 is on a distinguished road
I have replaced the neutral safety switch already. Everything else seems to wake up fine once the key is turned but no gear display and no crank..


Thanks,


Ozzie
__________________
X5 4.4 01
Reply With Quote
  #6  
Old 02-11-2020, 01:55 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 5,326
andrewwynn is on a distinguished road
Do you have a scanner that shows your gear selection; you canít start off course unless the dme is sure the transmission is in neutral or park.

I had that problem when my connector was dirty. Did you check it? You said you changed the valve body which would mean you had to disconnect and reconnect but was it already and stayed dirty. Also check the pins and see if they change appropriately when you pick different gears. If you canít see gear selections (I use foxwell NT510), neithe can the DME and you canít start.
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
  #7  
Old 02-11-2020, 09:24 AM
Member
 
Join Date: Feb 2010
Location: Chicago
Posts: 189
turquise1 is on a distinguished road
I use INPA and it shows the gear at 4 and it does not change as I move the shifter. I changed the neutral safety switch the first time the same thing happened right after replacing the transmission filter (which was a couple of weeks after replacing the valve body) to the original BMW. It did not solve the issue then until I replaced the TCM (I think I fried the TCM then when I was trying to snug in the oil level sensor cables which were not in real good shape) and I thought the same thing happened again. The connection felt a bit loose then so my next check would be that since I checked everything else..


Sorry for reporting a bit late each time but I do all my work on street in Chicago weather permitting and it takes time sometimes..


Thanks,


Ozzie
__________________
X5 4.4 01
Reply With Quote
  #8  
Old 02-11-2020, 10:00 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 5,326
andrewwynn is on a distinguished road
Are you north side of Chicago? Iím in Rogers park and have a garage I can work in. Itís even slightly heated as is under an apartment building so is typically about 45 in there.

It sounds like you have a bad harness. Was probably the actual problem vs the gear selector switch. Do you have 6 or 8 cylinder? The 6 is a birch to change the gear selector.

I had darn near exactly the same symptom you are describing and in my case was just a dirty connector plug. I would get crazy gear pin (I think they call them L pin) readings. And at one point the dash said I was in gear 54.

I would look up the pin out for the PRNDL and measure at the transmission. If you donít get the proper readings your internal harness is shot. If you do get the correct readings your harness from transmission to TCM is shot.

It can be just the connector in the eBOX.

Invest in some deoxit pro gold. Their is nothing better to clean up bad electrical connections.
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
  #9  
Old 02-11-2020, 10:35 AM
Member
 
Join Date: Feb 2010
Location: Chicago
Posts: 189
turquise1 is on a distinguished road
Wow, looks like you are only 10 mins away from me. I am at Edgewater by the lake. I have a 4.4 2001 which I would like to keep driving.


The harness inside the valvebody is replaced when I did that job to fix the transmission delayed engagement which did not change anything so I decided to replace the filter once again to an original one. That is when the trouble started in the garage that I was renting actually in Rogers Park. After I added the transmission fluid, everything was good until I tried to put the oil level sensor cable into its little groove which I believe fried the TCM. I replaced the neutral safety switch / transmission shift switch then to a new one. It did not solve the problem so I replaced the TCM to the spare I had for a while which fixed the issue. I have another spare one and this time it does not solve the problem. There is no gear display in instrument cluster and INPA only shows 4 when I switch thru gears. I can only see S when I move the gear to Sport side and nothing else.


I checked all the related fuses (5, 31, 54 are mentioned as engine control) but I will check them once again as well as the connection between neutral safety switch and transmission.


Thanks,


Ozzie
__________________
X5 4.4 01
Reply With Quote
  #10  
Old 02-11-2020, 10:39 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 5,326
andrewwynn is on a distinguished road
Do you have the original internal harness and did I read that you had the symptoms before doing the valve body? Everything you described points to wiring. Check all the connectors and do some pin to pin continuity testing.

Iíve read a few threads where the fix was replacing the cable from transmission to TCM and my bet is a worn through wiring harness at the firewall
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 05:07 AM.
vBulletin, Copyright 2020, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
© 2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.