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Rover 800 825 Jatco Automatic Gearbox Inhibitor Switch.


Rover 800 825 Jatco Automatic Gearbox Inhibitor Switch.
Rover 800 825 Jatco Automatic Gearbox Inhibitor Switch.

Car: 1999 Rover 800 825 V6 Coupe

Colour: Zircon Silver

When I first got this coupe and did the Jatco automatic gear box self diagnosis check the sport mode light flashed up a '5-5' fault code. After removing the gear box fuse so that the gear box memory would reset the fault never came up again, but I decided I would take a look at the inhibitor switch at some time anyway.

The location of the inhibitor switch on top of the gearbox makes it very inaccessible from under the bonnet in the engine bay. With a torch and long screwdrivers, I did manage to undue the three bolts that hold it on to the car, I then made sure it was aligned correctly (by lining up the hole in switch with the one on the gearbox)(with a long piece of dowel {err, garden cane}!), and tightened up the screws. I was not able to remove it from above though, even when I had tried removing the air filter box and starter motor (unsuccessfully!) out of the way, first.

Whilst the car was jacked up on another occasion (and supported on axle stands) for work in the passenger side wheel well, I decided to have another try at removing the inhibitor switch. I found it was much easier to get to it from this location, although it is still difficult trying to undo the wiring and clip prior to removal!

The inhibitor switch was not very dirty but I cleaned it up anyway. It was not the device I had been expecting it to be, I thought it was something that went inside the gearbox, but it is an electronic switching device that just sits on top of the gear box and is attached to the gear selector cable.

I took it apart to reveal what was inside it (rather than just putting it straight back on the car). It is quite a simple device full of contacts so that the electronics know what gear you are in, and to prevent the car from being started in gear I suppose.

Taking the inhibitor switch off the car has finally given me the peace of mind that I needed that all was okay with it.

...& putting it back on proved so much easier!



Rover 800 825 Jatco Automatic Gearbox Inhibitor Switch.
The Inhibitor Switch is Somewhere Beneath the Brake Servo on Top of the Gearbox, but Difficult to See and Get to from Above!

Rover 800 825 Jatco Automatic Gearbox Inhibitor Switch.
The Inhibitor Switch is Much Easier to Access from the Passenger Side Front Wheel Arch with the Wheel Arch Liners Removed.

Rover 800 825 Jatco Automatic Gearbox Inhibitor Switch.
The Top of the Inhibitor Switch with the Gear Selector Lever.

Rover 800 825 Jatco Automatic Gearbox Inhibitor Switch.
The Underside of the Inhibitor Switch after it has been Cleaned Up!

Rover 800 825 Jatco Automatic Gearbox Inhibitor Switch.
Opening up the Inhibitor Switch reveals the Contacts.

Rover 800 825 Jatco Automatic Gearbox Inhibitor Switch.
The Inhibitor Switch is all Okay and so it was Screwed Back Together and Refitted to the Top of Gearbox.




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