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93 850NA A2 OBD light on as soon as plugged in

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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Clivus
Posts: 6
Joined: 30 September 2023
Year and Model: 1993
Location: AR

93 850NA A2 OBD light on as soon as plugged in

Post by Clivus »

This is a new one, maybe, for you folks. I have been chasing an intermittent failure to start. Replaced fuel relay, fuel pump, injector seals, ECT. Thought I had it fixed until tonight.
I had previously had ECT codes even after replacing the ECT. I finally cut the wires and respliced. Since then, I've had no other 123 codes on A2 or A6.

I plugged the wire into A2 tonight and the light illuminated without any button press. If I pressed the button, the light would get brighter, but didn't respond as usual. Couldn't read, couldn't clear. The other ports responded as normal.

I'm praying this is a clue to what is finally wrong with this thing.

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