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850 fuel and temp gauge doesn't work

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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misuli18
Posts: 2
Joined: Tue Mar 13, 2018 1:15 am
Year and Model: 1988 740
Location: Europe

850 fuel and temp gauge doesn't work

Post by misuli18 »

Hello
My father has volvo 850 and odometer didn't work, he changed the gear and instrument panel worked 1 week as it should, then odometer stopped working again and he took that new gear and put it to another volvo 850 instrument panel. and he tested v70 instrument panels also, i dont know why.
Then fuel and temp and lights stopped working. Light fault was faulty light relay which probably didn't like v70 instrument panels.
But why fuel and coolant temp gauges won't work.
At a start both 850 instrument panels worked except odometers, and now neither of them works.

Is there some fuse or relay?
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WhatAmIDoing
Posts: 761
Joined: Sat Jul 30, 2016 1:13 pm
Year and Model: 1998 S70 T5M
Location: North America
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Re: 850 fuel and temp gauge doesn't work

Post by WhatAmIDoing »

The odometer does not display, or the odometer and speedometer do not measure speed/distance? My fuel and temp gauges read wonky, and I still have not been able to figure out why.
'98 S70 T5M - 282,000+mi - forever a project
'99 S70 "AWD" - 220,000+mi - part out :cry:
Knows enough to be dangerous :wink:
misuli18
Posts: 2
Joined: Tue Mar 13, 2018 1:15 am
Year and Model: 1988 740
Location: Europe

Re: 850 fuel and temp gauge doesn't work

Post by misuli18 »

odometer works now but fuel and temp gauges won't
scot850
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Joined: Mon Apr 05, 2010 2:46 pm
Year and Model: 2000 V70 R
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Re: 850 fuel and temp gauge doesn't work

Post by scot850 »

Have you tried pulling another speedo unit and fitting it to see if the circuit board has failed? Did both of those items work before and stop working at the same time? If they were bad before it may not be the speedo, but could be the sender units themselves (the ECT temp sensor for the temp gauge, check the connector at the power steering pump, and check the resistance values to make sure it is reading correctly), and it could be a bad earth or fuel level sensor in the fuel pump or in the wiring, particularly at the fuel pump itself.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold
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