1998 940 OBDII port

[Casheye]

Does anyone know if you need any special software/hardware to read any diagnostic info from this port? I've got an ABS light staying on with this car and I need to find the reason yesterday.

The bloke doing the work on at the moment said he can't read anything from the port. I know there are tutorials on making your own reader and that's probably something I'll do in the future, but right now I need an immediate answer. So any help would be great.

[Joe of Loath]

General consensus is, it's OBD2 shaped but it's not OBD2. As I understand it doesn't even use any sort of protocol, just pulls lines low and high to flash LEDs in a proprietary reader.

[Casheye]

Bottom line... Does that mean a trip to Volvo if I need it sorting?

[Joe of Loath]

No, the diagnostic box is super easy to build: http://www.volvoforums.org.uk/showthread.php?t=61562. If you're in a mega rush then either Volvo or a specialist might have one if you're desperate. I know a specialist in the Swindon area that might be worth phoning, they knew how to adjust my K-jet fuel injection so they're competent with cars of this era.

[TonyS9]

just unplug the abs sensors one at a time and check them, 2 pin grey plugs in the engine bay near the top of the wing. looking for 1Kohm from memory.

[Casheye]

just unplug the abs sensors one at a time and check them, 2 pin grey plugs in the engine bay near the top of the wing. looking for 1Kohm from memory.

Thanks, I'll look at it in the morning.