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volvo 1993 850 GLT codes check engine light

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

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lawsontg
Posts: 2
Joined: Wed Jul 10, 2019 12:35 am
Year and Model: 1993 850 GLT
Location: Arizona

volvo 1993 850 GLT codes check engine light

Post by lawsontg »

My 93 850 had service light on for couple weeks, goes off after couple minutes. Then Check Engine light came on and stayed on. I followed steps from an 850 document on this site, recorded codes then cleared. drove car check engine still on. tried again, then checked cleared B box. now no check engine light. now what? Do codes that were cleared need to be checked out? Still get short service light, but car runs fine. Some codes match with list in this sites OD1 for 850, some not but wonder if clearing them means they were just stored or needed attention. Bottom line is all codes except B5 were cleared, no Check Engine light on after driving several times, Service light comes on for a minute. Anyone know what next step is. Don't really want to go foreign car place and spend $500 - $1000, especially if car only needs some tune-up adjustment. Had oil changed and all fluids checked recently.
codes were:
A1 clear
A2 clear
A3 4-4-4 2-1-4 2-1-3
A6 1-1-2 1-3-2
A7 clear

B1 4-1-4 2-1-1 2-3-5
B2 1-2-2
B5 2-1-2

B2 would not clear using steps in OD document.
User avatar
misha
Posts: 4506
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 59 times
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Re: volvo 1993 850 GLT codes check engine light

Post by misha »

A6 is ignition ecu.
It sets cel just like A2,which is engine management(ecu).
LH 3.2 Jetronic have engine management and ignition ecu as a two separate units.

You need to read and reset codes from A6 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
lawsontg
Posts: 2
Joined: Wed Jul 10, 2019 12:35 am
Year and Model: 1993 850 GLT
Location: Arizona

Re: volvo 1993 850 GLT codes check engine light

Post by lawsontg »

Thanks for reply. Have reset all, and check light not back on. Does that they were just stored and not important, or do I need to have a mechanic check it all out? The car is starting and running great, all fluid levels ok, oil change and checkup done 3 weeks ago.
Don't want to pay the high prices of foreign car shops unless immediate need.
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BEJinFbk
Posts: 3756
Joined: Sat Jan 05, 2008 10:32 pm
Year and Model: '98 V70 R
Location: Fairbanks, Alaska
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Re: volvo 1993 850 GLT codes check engine light

Post by BEJinFbk »

Service light is just that. It’s triggered by
your odometer to remaind you to change,
your oil, etc. Should be an easy reset on
an 850. Dig around the site a little.
'98 V70 R - Well Equipped for Life Up North... ;)
User avatar
misha
Posts: 4506
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 59 times
Been thanked: 163 times

Re: volvo 1993 850 GLT codes check engine light

Post by misha »

'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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