ABS PSD Warnings after bump on '90 GT

Since getting my '90 GT back from service, the ABS & PSD warnings are displayed apparently after the first significant bump. Often they display at the same time, but sometimes the PSD followed by the ABS.

I am presuming it is a loose connection, and more likely rear of the car related since I don't think the PSD would care what happens at a front wheel. Any thoughts on what connections and where to check? Perhaps removing the two grounds at each rear wheel to start? They seem solidly connected when tugged at a bit.

The ABS and PSD circuits are linked through the fuse/ relay panel.....I'd check the relay (XV) to start.

Has the PSD system been serviced (fluid flush)?

malcolm;7245 wrote: The ABS and PSD circuits are linked through the fuse/ relay panel.....I'd check the relay (XV) to start.

Has the PSD system been serviced (fluid flush)?

I will re-seat the relay, inspect the pins, etc.

Yes, the PSD was flushed a year ago and operated fine after that. I suspect this issue has arisen due to the quite a bit of electrical diagnosis type work that was performed.

Thanks Malcolm.

no worries Stan.......beyond the relay Id look at the controller and the ABS sensors.

We are a captured audience for ~4 mths......damn winter:eek:

The rear abs sensors were my first thought.
I anticipate I am looking for a component in common between the ABS and PSD.
Do you know if they are used by the PSD?
Do you think I should remove clean and reinstall? Just looking at them I don't see an issue.

Yes, the ABS sensors are part of the shared PSD circuitry.

Yes, they can be cleaned, I use use brake cleaner and a small brush (toothbrush).

There are resistance spec for the ABS sensors.....let me find them