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850R no obd2

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

Mstrshkbrnnn
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Joined: Wed Jul 10, 2019 12:13 am
Year and Model: 94 850
Location: Seattle
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Mstrshkbrnnn

850R no obd2

Post by Mstrshkbrnnn » Wed Oct 02, 2019 1:28 pm

I recently purchased a 96 r, and its got a few faults. ABS light and TRACS light are intermittently on, but i know the cause for those, so im not too worried about it, but at startup, the service light will turn on as well, before shutting off shortly after. my coworker has got one of those crazy matco scan tools with volvo software installed on it, but for some reason, no matter how many times he updates his tool, it can never "connect" to my car. I'm assuming there is some connection malfunction somewhere along the line, but im not sure what to check for, or where to start. for a little background, the previous owner installed some shitty aftermarket head unit, and did an equally shitty job installing it; could he have messed a connection up in the process?


'94 854 NA 287k (bought for $400)
'98 s70 GLT 243k (bought for $250 currently non running)
'96 854R 173K (bought for $900)

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Clemens
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Joined: Thu Sep 03, 2015 12:34 pm
Year and Model: 96 855 R + 94 855 T5
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Clemens

Re: 850R no obd2

Post by Clemens » Wed Oct 02, 2019 3:03 pm

the 96 and 97 Volvo OBD2 is kinda weird. most obd readers cannot communicate with it if I remember correctly. i always have a Volbo dealer read the codes if any appear.

the service light comes on after a year or xx.xxx miles. It reminds you of the annual service.
The lights to worry about are the dreadful blinking arrow and the lambda sign (might be a different icon for US models).


Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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matthew1
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Year and Model: 850 T5, 1997
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matthew1

Re: 850R no obd2

Post by matthew1 » Wed Oct 02, 2019 3:38 pm

What year 850 are we talking about here? Your profile lists a 1994 850, but the title says 850 R, which is a 1996 or 1997.

NM. I see your signature has a '96 854R.

A 1996 should connect. It is a fully functioning OBD-II system.

A head unit will not affect OBD.


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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

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erikv11
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erikv11

Re: 850R no obd2

Post by erikv11 » Wed Oct 02, 2019 3:42 pm

Yeah I agree, I would try a scanner that you know can connect to an 850 (or VOL-FCR etc.), before suspecting any problem with the car's OBD2. I suspect it is the scanner.

For the service light the fix is to remove the bulb.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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matthew1
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matthew1

Re: 850R no obd2

Post by matthew1 » Wed Oct 02, 2019 3:46 pm

Go ahead and get yourself a cheap OBD-II code reader. They're under $20, and it'll pay for itself many times over with your three OBD Volvos.

My Autel cheapie OBD-II scanner works every time, almost ten years later.


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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

Mstrshkbrnnn
Posts: 28
Joined: Wed Jul 10, 2019 12:13 am
Year and Model: 94 850
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Mstrshkbrnnn

Re: 850R no obd2

Post by Mstrshkbrnnn » Wed Oct 02, 2019 4:25 pm

I own a scanner just like that one Mathew. I'll try it when i get home. I was just concerned because, i assumed if a specialized scan tool failed to connect, it was an issue with the car


'94 854 NA 287k (bought for $400)
'98 s70 GLT 243k (bought for $250 currently non running)
'96 854R 173K (bought for $900)

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Goupil
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Goupil

Re: 850R no obd2

Post by Goupil » Thu Oct 03, 2019 12:38 pm

Might be a dumb question, but do you even have power to the OBD plug ?

When I got mine it had a blown fuse, iirc the obd fuse is shared with the AC
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1998 Volvo V70 B5254T manual 193hp - 319 000 km

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matthew1
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matthew1

Re: 850R no obd2

Post by matthew1 » Thu Oct 03, 2019 1:01 pm

Mstrshkbrnnn wrote:
Wed Oct 02, 2019 4:25 pm
I own a scanner just like that one Mathew. I'll try it when i get home. I was just concerned because, i assumed if a specialized scan tool failed to connect, it was an issue with the car
Sometimes the simplest effort is the most successful. More advanced technology always equals more variables. Reducing variables is the heart of troubleshooting.


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Also -> Amazon link
. Click that when you go to buy something on Amazon and MVS gets a kickback.

1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

Mstrshkbrnnn
Posts: 28
Joined: Wed Jul 10, 2019 12:13 am
Year and Model: 94 850
Location: Seattle
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Mstrshkbrnnn

Re: 850R no obd2

Post by Mstrshkbrnnn » Thu Oct 03, 2019 7:07 pm

Goupil wrote:
Thu Oct 03, 2019 12:38 pm
Might be a dumb question, but do you even have power to the OBD plug ?

When I got mine it had a blown fuse, iirc the obd fuse is shared with the AC
just checked the fuse, and yes, it is receiving power. when my roommate get back home im gonna use his cheapo scanner that Matthew was recommending, and i'll get back to the thread with the results.


'94 854 NA 287k (bought for $400)
'98 s70 GLT 243k (bought for $250 currently non running)
'96 854R 173K (bought for $900)

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