Vehicle & Technical > Range Rover

Speedo And Mileage Not Working

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benbenukuk:
Hi, The Speedo And Mileage are Not Working on my rrc any ideas of how I can sort it out, I have no ideas as I only got it to day, thanks.  Ben

Range Rover Blues:
Speedo and odometer go hand in hand.

Firstly then what year?

Earlier ones had a mechanical drive form the gearbox.  A favourite is for the right angled drive on the back of the speedo head to pack up, the gears are cast in White Metal (Babbit's metal) and are cack.

Any 3.5 and 1988 3.9s would have this speedo, it looks like the SD1 speedo if that helps.

When hot wire EFi came in on the last 3.5s it needed a road speed signal, so the speedo cable is interupted by the transducer bolted to the chassis rail alongside the gearbox, if you have one of these rare beasts then there's an axtra set of cable joints to check.

If it's a 1989 3.9 or later, with a more traditionally shaped speedo (that you can actually read by the dahboard lights) then it's an electronic unit.  This is driven by a transducer (same as described above) and is fully electronic, the sensor pulses (inside is a reed switch) are filtered by the road speed buffer, a white box that looks like a relay.  The signal is shared by the cruise control and the EAS too, so if you have those then check if they work, if you don't you can check for the road speed signal at the engine ECU.

Confused yet :)

Guardian.:
 :shock:ANd i was just gonna say change the cable. :)

barriesheene:
Bl@@dy hell  :shock: I'm glad mines working  :?

ChrisV8:
If it's the electronic type could be as simple as a blown fuse, that's what happened with daughters just after MOT, do the indicators work ? Cos I think it's on the same fuse !

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