Engine: 850 T5/R - HELP!! ECU dead but I don't want have to scrap the car

dgremac · Nov 5th, 2022, 12:58

850 T5 1995:

I love my T5 but after numerous garage visits it is now confirmed that the ECU is dead and can't be repaired. I have tried so many ECU specialists etc. but I'm getting the impression they are laughing at me when I tell them; apparently there were some 14 different ECU's used on the T5's during the late 1990's!
Does anyone have a T5 they are breaking or similar, with an ECU that will do the job? Or, any recommendations for an alternative unit?
The 'dead' ECU is a BOSCH 0261 200 549
I really don't want to give up on the car and break it.

downstream · Nov 5th, 2022, 13:57

Upgrade to a Motronic 4.4 ECU? Better than scrapping the car...

https://m44.fandom.com/wiki/M44_Wiki

dgremac · Nov 5th, 2022, 18:14

Thank you. I'll have to refer this to my other half as it's far too technical for me.

PNuT · Nov 5th, 2022, 18:50

Motronic 4.3 ecus are fairly plug and play....

IIRC a auto ecu will work on both auto & manual but a manual ecu will only work on manual...

I do have two 4.3 ecus kicking about but I never get round to posting stuff like that hence why I have them!

Goupil · Nov 5th, 2022, 21:09

This is definitely not something worth scrapping a car.

You could either find another M4.3 ECU, with people still parting out these cars it shouldn't be impossible, or upgrade to an M4.4 if you feel like it.

dgremac · Nov 6th, 2022, 13:16

Quote:

Originally Posted by PNuT

Motronic 4.3 ecus are fairly plug and play....

IIRC a auto ecu will work on both auto & manual but a manual ecu will only work on manual...

I do have two 4.3 ecus kicking about but I never get round to posting stuff like that hence why I have them!

Many thanks for this, Motronics seems the way to go (even the Haynes manual refers to it). How about breaking a habit of a lifetime and mailing one out to me? I'll reimburse you the costs and, of course pay you for the unit. PM me if you are able to oblige. Tx

Simmy · Nov 6th, 2022, 14:43

give shem green a call at shemtec automotive im sure he will be able to help.

RollingThunder · Nov 7th, 2022, 11:23

Something I found a few years ago, might be useful for you... (its on my website nowadays)

Good luck!

Volvocano · Nov 7th, 2022, 14:15

Another option for cars where you're starting to distrust the older electronics and/pr they are becoming rare is to fit an aftermarket Megaquirt ECU and (where appropriate), individual spark plug coil packs while you're there to get rid of all the HT paraphernalia, not that expensive. More popular cars will have maps ready to go but something more left-field may require a fair bit of rolling road time or a Wideband Lambda setup for closed loop auto tuning. More often than not most cars with any form of stock EFi will already have all the triggers and sensors you need fitted.

PNuT · Nov 8th, 2022, 07:49

Quote:

Originally Posted by dgremac

Many thanks for this, Motronics seems the way to go (even the Haynes manual refers to it). How about breaking a habit of a lifetime and mailing one out to me? I'll reimburse you the costs and, of course pay you for the unit. PM me if you are able to oblige. Tx

I have two & I don't know which is which!

I may be able to work it out from the above table.....

Nov 5th, 2022, 12:58	#1
dgremac Mitch Last Online: May 21st, 2023 22:13 Join Date: Nov 2022 Location: CRAVEN ARMS	HELP!! ECU dead but I don't want have to scrap the car 850 T5 1995: I love my T5 but after numerous garage visits it is now confirmed that the ECU is dead and can't be repaired. I have tried so many ECU specialists etc. but I'm getting the impression they are laughing at me when I tell them; apparently there were some 14 different ECU's used on the T5's during the late 1990's! Does anyone have a T5 they are breaking or similar, with an ECU that will do the job? Or, any recommendations for an alternative unit? The 'dead' ECU is a BOSCH 0261 200 549 I really don't want to give up on the car and break it. Last edited by dgremac; Nov 5th, 2022 at 13:09. Reason: Added ECU details

Nov 5th, 2022, 18:50	#4
PNuT MaDMaN Last Online: Nov 26th, 2022 18:47 Join Date: Sep 2006 Location: Red Lodge	Motronic 4.3 ecus are fairly plug and play.... IIRC a auto ecu will work on both auto & manual but a manual ecu will only work on manual... I do have two 4.3 ecus kicking about but I never get round to posting stuff like that hence why I have them! __________________

Nov 5th, 2022, 21:09	#5
Goupil Junior Member Last Online: Apr 8th, 2024 19:08 Join Date: Mar 2019 Location: Brittany	This is definitely not something worth scrapping a car. You could either find another M4.3 ECU, with people still parting out these cars it shouldn't be impossible, or upgrade to an M4.4 if you feel like it. __________________ 1998 V70 2.5T Summum - B5254T - M56

Nov 7th, 2022, 11:23	#8
RollingThunder Grumpy Old Git Last Online: Jun 18th, 2024 12:28 Join Date: Dec 2004 Location: South Yorkshire View Photos By: RollingThunder	Something I found a few years ago, might be useful for you... (its on my website nowadays) Good luck! __________________ S40 2.4i '07 Japanese import '96 850R - https://www.volvoforums.org.uk/showthread.php?t=312484 Ex Danish Embassy '96 940 GLE LPT - https://www.volvoforums.org.uk/showthread.php?t=326071

Nov 5th, 2022, 13:57	#2
downstream Junior Member Last Online: Today 05:49 Join Date: Sep 2019 Location: Carlisle	Upgrade to a Motronic 4.4 ECU? Better than scrapping the car... https://m44.fandom.com/wiki/M44_Wiki

Nov 5th, 2022, 18:14	#3
dgremac Mitch Last Online: May 21st, 2023 22:13 Join Date: Nov 2022 Location: CRAVEN ARMS	Thank you. I'll have to refer this to my other half as it's far too technical for me.

Nov 6th, 2022, 14:43	#7
Simmy Premier Member Last Online: Today 15:09 Join Date: Mar 2017 Location: Manchester	give shem green a call at shemtec automotive im sure he will be able to help.

Nov 7th, 2022, 14:15	#9
Volvocano Member Last Online: Yesterday 20:04 Join Date: Jul 2022 Location: London	Another option for cars where you're starting to distrust the older electronics and/pr they are becoming rare is to fit an aftermarket Megaquirt ECU and (where appropriate), individual spark plug coil packs while you're there to get rid of all the HT paraphernalia, not that expensive. More popular cars will have maps ready to go but something more left-field may require a fair bit of rolling road time or a Wideband Lambda setup for closed loop auto tuning. More often than not most cars with any form of stock EFi will already have all the triggers and sensors you need fitted.

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