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1995 OBD 1 malfunctioning

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
tysauce1986
Posts: 18
Joined: Sun Jan 20, 2019 2:35 pm
Year and Model: 1995 850 GLT wagon 5
Location: Norwich,CT
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tysauce1986

1995 OBD 1 malfunctioning

Post by tysauce1986 » Sun Apr 14, 2019 7:03 am

Hello MVS community. About 3 months ago I inherited a 1995 850 glt wagon 5spd NA. Needless to say I've got the bug! I'm having an issue with the obd1. The terminal lights up when I press the button and there is power (about 10v) to all the sockets. When I try to retrieve codes it does not work. My brother, whom I inherited the car from, said something about wires being disconnected somewhere but he wasn't sure. The check engine light is on and I'm not sure what to do. It's like it's not communicating with the computer. I've read about replacing the unit. But I'm not even sure where to get a known good one. Am I doing something wrong? Any advice welcome. Thanks in advance!!



Ozark Lee
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Ozark Lee

Re: 1995 OBD 1 malfunctioning

Post by Ozark Lee » Sun Apr 14, 2019 1:18 pm

The jumper wire (flywire) with the plug that you insert into the port(s) is a known weak spot. I have repaired them before by shortening the flywire and soldering it back onto the contact plate below the button and I have also replaced the wire completely on another one. I think I used a standard crimp on "Bulllet" connector from the electrical aisle at Home Depot to make the plug and then some old 22 gauge stranded wire I had laying around.

In either case, you need to disassemble the socket assembly which is actually quite easy. The entire assembly fits on a connector and then the case can be opened by prying it gently away from its locking tabs. I think there are four tabs so I used toothpicks to keep them open while I went onto the next tab.

You do need to be a bit careful when taking it apart or the spring under the button will go sailing on you as the shell comes off.

...Lee
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tysauce1986


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

tysauce1986
Posts: 18
Joined: Sun Jan 20, 2019 2:35 pm
Year and Model: 1995 850 GLT wagon 5
Location: Norwich,CT
Has thanked: 6 times
Been thanked: 1 time
United States of America
tysauce1986

Re: 1995 OBD 1 malfunctioning

Post by tysauce1986 » Sun Apr 14, 2019 3:43 pm

I pulled the OBD 1 unit out and it looks like the fly wire has already been shortened and or soldered to the "Bullet". When I was pulling the box I noticed there is a single green/red stripe wire at the front. It doesn't appear to be connected to anything. There was plenty of corrosion in the in the exposed connector. could this have anything to do with my problem?



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