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Motronic 4.4 immobilizer

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

radek93
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Motronic 4.4 immobilizer

Post by radek93 » Thu Mar 05, 2020 1:47 pm

I have S70 2.5t 98r. How works immobilizer? Immobilizer module take signal from key and send info to engine ecu? Can I change engine ecu without immobilizer cut?

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misha
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Re: Motronic 4.4 immobilizer

Post by misha » Thu Mar 05, 2020 1:59 pm

Up to '99 immobiliser reads the code from the key and just sends OK signal to ecu.

Basically....key communicates ONLY with immo2 box and then immo2 box sends OK signal to ecu.
Key(chip in it) is only married to immo2 box module.

That said...up to '99 you can swap ecu since it's not married to the car.
BUT....you will need ecu with the same BOSCH numbers because of software difference with M4.4 management.

Late 850 like mine also have M4.4 from the factory,but it's non-turbo.
You will need ecu from LPT 850 with M4.4 or from '97 & '98 s,v70 for LPT engine.
Last edited by misha on Thu Mar 05, 2020 2:04 pm, edited 1 time in total.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

radek93
Posts: 26
Joined: Sat Dec 07, 2019 2:43 pm
Year and Model: S70 98
Location: Home
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Re: Motronic 4.4 immobilizer

Post by radek93 » Thu Mar 05, 2020 2:03 pm

misha wrote: ↑
Thu Mar 05, 2020 1:59 pm
Up to '99 immobiliser reads the code from the key and just sends OK signal to ecu.

Basically....key communicates ONLY with immo2 box and then immo2 box sends OK signal to ecu.

That said...up to '99 you can swap ecu since it's not married to the car.
BUT....you will need ecu with the same BOSCH numbers because of software difference with M4.4 management.

Late 850 like mine also have M4.4 from the factory,but it's non-turbo.
You will need ecu from LPT 850 with M4.4 or from '97 & '98 s,v70 for LPT engine.
Approx. So all I have to do is buy a computer with b5254t and it should work?

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misha
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Re: Motronic 4.4 immobilizer

Post by misha » Thu Mar 05, 2020 2:06 pm

Yes...but Bosch numbers from original ecu needs to be exactly the same on a replacement ecu...year too.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

User avatar
misha
Posts: 4202
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 54 times
Been thanked: 117 times
Serbia
misha

Re: Motronic 4.4 immobilizer

Post by misha » Thu Mar 05, 2020 2:09 pm

Where are you from?
1997 850 GLT B5254T and s,v70 2.5T(B5254T) from '97 & '98 have the same engine and management(M4.4).
So...ecu swap between those two cars for EU spec.will be plug and play as long as Bosch numbers match.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

radek93
Posts: 26
Joined: Sat Dec 07, 2019 2:43 pm
Year and Model: S70 98
Location: Home
Has thanked: 0
Been thanked: 0
Poland
radek93

Re: Motronic 4.4 immobilizer

Post by radek93 » Thu Mar 05, 2020 5:54 pm

misha wrote: ↑
Thu Mar 05, 2020 2:09 pm
Where are you from?
1997 850 GLT B5254T and s,v70 2.5T(B5254T) from '97 & '98 have the same engine and management(M4.4).
So...ecu swap between those two cars for EU spec.will be plug and play as long as Bosch numbers match.
Poland. Ok. Thank You.

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RickHaleParker
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Re: Motronic 4.4 immobilizer

Post by RickHaleParker » Thu Mar 05, 2020 10:10 pm

radek93 wrote: ↑
Thu Mar 05, 2020 2:03 pm
Approx. So all I have to do is buy a computer with b5254t and it should work?
Look at your ECM. You will find a software number in the format "0 261 204 XXX".
You need to find a replacement ECM with the same software number. All ten digits must match.
--------
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

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misha
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Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
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Re: Motronic 4.4 immobilizer

Post by misha » Fri Mar 06, 2020 2:16 am

RickHaleParker wrote: ↑
Thu Mar 05, 2020 10:10 pm
Look at your ECM. You will find a software number in the format "0 261 204 XXX".
That would be a Bosch part number(10-digit number).
Software numbers are under bar codes.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

User avatar
RickHaleParker
Posts: 3962
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 492 times
United States of America
RickHaleParker

Re: Motronic 4.4 immobilizer

Post by RickHaleParker » Fri Mar 06, 2020 1:39 pm

misha wrote: ↑
Fri Mar 06, 2020 2:16 am
RickHaleParker wrote: ↑
Thu Mar 05, 2020 10:10 pm
Look at your ECM. You will find a software number in the format "0 261 204 XXX".
That would be a Bosch part number(10-digit number).
Software numbers are under bar codes.
All Bosch M4.4 hardware is the same. The only difference between one Bosch M4.4 part number and another is the software. That is why the tuners call out the software version by the last three digits of the part number. Match the numbers as I outlined above and the software will match. It is that simple.
--------
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

User avatar
misha
Posts: 4202
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 54 times
Been thanked: 117 times
Serbia
misha

Re: Motronic 4.4 immobilizer

Post by misha » Fri Mar 06, 2020 2:06 pm

Nope.....
https://www.google.com/search?sxsrf=ALe ... ZVxo_UDmQM:

Software version is somewhere under those bar codes.

Bosch 10 digit numbers indicates just part number for ecu.

Those numbers are the same and software numbers(codes) are different.

As you can see from the picture...last 3 digits from Bosch part number (10 digits number)doesn't match with any number under the bar codes.

I have somewhere in my computer a data where exactly is softvare version,but i'm on the phone now.
I'll post it if you want to see yourself.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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