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1993 850 coming from wrong port.

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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BigLib
Posts: 8
Joined: 30 March 2025
Year and Model: 1993 850
Location: Dallas, TX
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1993 850 coming from wrong port.

Post by BigLib »

All of my codes are coming out of A3 but according to the charts none of the codes should come out of A3. It's this a problem?

scot850
Posts: 14864
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Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
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Post by scot850 »

Been a long time since I had a 93 850 with the engine bay diagnostic ports. I had to go to this video from Robert DIY. Perhaps this may help to answer your question:



Neil.
2006 V70 2.5T AWD Polestar tune
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold

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misha
Posts: 5379
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Year and Model: '97 850 2.5 20v
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Post by misha »

A3 is diagnostic port for abs.
Engine codes should be read from A2(ecu) & A6 (ignition module).
'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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Clemens
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Year and Model: 96 855 R + 94 855 T5
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Post by Clemens »

Are the codes you are getting plausible?

If they are, it's weird but at least you can work with them. The blinky box in my 94 T5 is funky too, some ports that should work simply don't have a metal socket and therefore don't respond at all, and not all codes seem to have numbers that should be created by the specific port in use.
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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