Intermittent power steering loss on a Q?

[spc]

I have a 91 Q & I am getting intermittent power steering loss. It steers fine for a while & then it's like it has no power steering. I am still able to steer but like I said it is like a car without power steering. Any help would be appreciated. Thank you.

[Professor_Mike]

The manual gives the procedure to check the circuitry, usually checking the correct terminal in the diagnostic connector while driving will isolate the problem. I have seen 2 controllers fail recently, both would drop test voltage when tapped.

[Rmay]

Does your sppedo drop out at the same time? That's what happens to me - speedo conks out and the power steering drops out at the same time.

When I posted this problem recentlyy, the reply was that the speed sensor/speedo head unit needs to be replaced. I have the part on order, so I haven't replaced it yet.

[spc]

No, I have not noticed that but when it happens, if I shut the car off & start it up again power steering comes back. Also it seems to happen more in warmer weather.

[forecast]

sounds like a failing power steering control unit. This is box about the size of a deck of cards buried in the dash.

The manual shows to test the units output (control) voltage where the consult adapter is in the fuse box.