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OBD plug wiring 94 850

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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Sommerfeldt
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Re: OBD plug wiring 94 850

Post by Sommerfeldt »

misha wrote:If you read the thread more carefully from the begining,you would see that i thought he have n/a car...and UP TO '96 ,20V cars have Jetronic engine management.
;)
If he'd pulled a Jetronic and simply dumped in a Motronic box, he'd have more serious issues than the OBDII-connector not working.

- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
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misha
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Post by misha »

Basically....he couldn't even start the engine with mot 4.4 instead of jetronic since jetronic system have two ecu(s)...the other one is for ignition and both of them works like one.
But...with re-programmed ecu(like he allready mentioned) and with wiring modifications it could be possible.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
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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tryingbe
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Post by tryingbe »

skloon wrote:Same thing with the 4.3 no communication with ecu I will unplug the obd1 tomorrow and see what happens
Not sure how you're going to "unplug" the obd1. Regardless, the obd1 will have nothing to do with your obd2 not working.

misha wrote:But...with re-programmed ecu(like he allready mentioned) and with wiring modifications it could be possible.
There is no wiring modification needed for using M4.4 ECU on M4.3 car.
85 GLH, 367 whp
00 Insight, 72 mpg
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Ozark Lee
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Post by Ozark Lee »

The OBD-I box has a connector on the bottom and you can just unplug it.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe
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tryingbe
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Post by tryingbe »

Ozark Lee wrote:The OBD-I box has a connector on the bottom and you can just unplug it.

...Lee
Regardless, OP is wasting his time on OBDI connector when he should be checking the wiring on the OBDII connector.

Maybe I'm blind.

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85 GLH, 367 whp
00 Insight, 72 mpg
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Ozark Lee
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Post by Ozark Lee »

Since it didn't work with the 4.3 or the 4.4 I would tend to agree.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe
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Sommerfeldt
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Post by Sommerfeldt »

misha wrote:Basically....he couldn't even start the engine with mot 4.4 instead of jetronic since jetronic system have two ecu(s)...the other one is for ignition and both of them works like one.
But...with re-programmed ecu(like he allready mentioned) and with wiring modifications it could be possible.
:roll:

- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
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misha
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Post by misha »

:arrow:
:wink:
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
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
Top
Sommerfeldt
Posts: 1148
Joined: 29 July 2008
Year and Model: 2018 S90 T8
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Post by Sommerfeldt »

Because that's what I already said. I don't think he'd be worried about the OBDII not working if he'd tried to drop an M4.4 in a Jetronic-managed car. I'm not even sure it's possible, even with, as you say, programming and wiring modification. I can't find anyone who's done it, and with differences in even K and LH, I don't think it can be done w/o swapping the whole shebang. Everything is different - even the MAF, for crying out loud.

- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
Top
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skloon
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Post by skloon »

The car works and drives fine with the 4.4 but I threw a code and want to see what it is- I don't feel like tracing all the wires back to the ecu so I guess I will try and figure out the wiring diagram
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