1997 940 - Speed/odometer temporary stopped working

Metallo · Post by **Metallo** » 13 Jun 2015, 16:49

Hi,

About one year ago my speed/odometer stopped working for a few minutes and then started again.
On week ago it stopped again, so I switched the engine off and started it again, the speed/odometer is working fine again since then.

Any suggestion on where to start from to locate the root cause of the problem?

Thank you
Alex

93Regina · Post by **93Regina** » 13 Jun 2015, 19:47

Metallo wrote:...speed/odometer stopped working..

When both are not working, it would suggest something from rear-end sensor to speed/odometer unit.

Drive it, and set cruise next time if fails...does cruise work?

I have no idea if this is applicable: 740/940 Instrument Cluster Repair (1991+)

lummert · Post by **lummert** » 13 Jun 2015, 20:14

Is ABS also not working correctly?

Metallo · Post by **Metallo** » 14 Jun 2015, 05:17

93Regina wrote:
Metallo wrote:...speed/odometer stopped working..
When both are not working, it would suggest something from rear-end sensor to speed/odometer unit.

Drive it, and set cruise next time if fails...does cruise work?

I have no idea if this is applicable: 740/940 Instrument Cluster Repair (1991+)

If by cruise you mean the cruise control, my car has no cruise control.
Everything seemed to work fine but the odo and the speed meters.
I will wait next time, it may take another year, what I find strange is that it gets to work again once you switch the motor off/on.

Anyhow, let's see next time

Thanks
Alex

Metallo · Post by **Metallo** » 14 Jun 2015, 05:19

lummert wrote:Is ABS also not working correctly?

ABS? It is working the few times I need it, that is, in the winter with snow and ice...

Alex

93Regina · Post by **93Regina** » 14 Jun 2015, 06:48

Metallo wrote:...odo and the speed meters..

I've never dealt with this issue, but most likely, either the ground or positive sources supplying electric motor is the issue.

I don't know if these +/- sources are via physical wires, or ribbon cable on back-side of board there.

Metallo · Post by **Metallo** » 23 Jun 2015, 14:32

OK guys,

this morning it happened again while on my way to work, however, I noticed that hitting the dashboard just above the whole cluster it makes the odo/speed meters work again, then stop then start again and so on.

It might be a soldering issue or perhaps, a connection, so I will follow the link previously posted by 93Regina: http://www.turbobricks.com/maint.php?content=art0031

Let's see what I will find out.

Alex

Metallo · Post by **Metallo** » 04 Jul 2015, 09:30

Working to remove the cluster... anybody knows the correct way to disconnect the hose that goes to the turbo gauge?

Do I simply need to pull out the plastic connector (beige color) from the gauge?
If yes, is there a specific direction I have to turn it to remove or simply pull it out?

Otherwise, should I just remove the black hose from the plastic connector?

Thank you!
Alex