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Also, in line with Uncle Onkel Udo II's question, did you perform teh:
https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm
See Bill's list, though the FAQ ECU list may be newer by now.
http://www.nuceng.ca/bill/volvo/database/ecu.htm
Though if you reside in a snow and salty, or always wet, or what have you climate, than that can cause corrosion in wire harness connectors where the little seals have failed.
As for grounds, well, you have wiring diagram resources in the big blue Bentley 240 manual (if yeh can read em), and in teh Haynes, and in teh:
http://www.volvowiringdiagrams.com/
As for grounds, well, visual inspection around the engine bay.
A Volvo TSB suggests treating the injector ground wires, secured to the top of intake port runner #2 and #3, should be treated by flowing solder into the crimps, replacing the ring terminals at teh end of the brown wires, and so forth. There a carbon steel hex head bolt (10 mm) that secure into the light aluminum alloy intake port, so aluminum being less noble, corrodes in contact with the more noble carbon steel alloy bolt.
Dialectric grease in the connectors. Yet you can use No-Ox or DeOX (a conductive, corrosion inhibiting grease treatment) on grounds and such.
The fuse box -- clip contact that hold the fuses in -- corrosion forms on the terminated wires that connect to the fuse box. (Disconnect the battery).
You have grounds under teh dash, secured to the body sheet metal, connected to the dash sheet metal, and more.
I dunno.
Hope that helps.
Happy Friday everybody!
And now, from Grumpy Cat!
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