Speedometer sensor location?

[Harvey]

1992 9000 Automatic.

My speedo has stopped working. The parts list shows a sensor and wiring to the speedo head.  The sensor appears in the drawing to be behind the dash but I assume that it must be near the gearbox somewhere.

Anyone know the exact location?

thanks,

Harvey

[chris aka zaphod]

ABS - left rear wheel, IIRC.

[Paul @ Kippen]

Harvey,

Sorry,  can't agree with Zaphod on this one.  The  'sender' is located on the top of the gearbox casing down the back of the engine.  it is retained by one 'Torx' bolt which can be a pig to loosen.  There's very little space and it's difficult to get enough downward pressure to stop the bit from 'camming' out.

The sender is gear driven from a little nylon gear on the differential crown wheel.  If this, and the gear that is part of the sender gets worn then you will loose the speedo.  THIS IS A BAD THING.  The engine ecu gradually looses the place and running becomes very rough.  Stalls every time you slow down etc.

If you're lucky, replacement of the gear attached to the sender gives enough engagement for it to work, if not then it's a 'box out and strip job.  Of ourse it could just be that the sender is goosed, the connector has fallen off or there is a wiring fault.  Unforunately my experiences fall in the middle ground.

Paul @ Kippen.

[chris aka zaphod]

Sorry yes - completely wrong vehicle
I am going senile. 

[wrighar]

Hoppefully being an Auto it will not suffer the problems the manuals had with the drive gear failing, but what do I know...

When mine went it was the transducer mounted on the gearbox, so was an easy and cheap fix, and failure in the prevoious weeks showed a bouncing or lathargic speedo when pulling away.

[Harvey]

Thanks guys.  Yes, as Paul says, on the gearbox casing.  I haven't actually seen it yet but I can see where it is and the electrical connector..  Probably access from underneath.  I'll try the connector first if I can get it apart.

There have been no symptoms of poor running at all. No indication that the speedo was failing: just didn't work one day.  Maybe that means the sender is ok and it is the speedo end that's failed.

This car is a 2.3 Auto non-turbo.  Maybe it is only the turbo cars that 'hiccup' when this sender fails............

Harvey