Speedo stops working intermittently

[Geewhite32]

Hi all, I am having issues with my speedo.

Sometimes it doesnt work or other times it works then stops working...only for a short time though. but occasionally while just driving about.

It also.... when it stops working seems to increase the power and response from the engine and the throttle.

As well as that, if it isnt working on start up, when it does work, the central locking clicks on, locking the doors ( I have it set up to lock on moving)

Can anyone explain as to why this is please?

Hope you can help.

Gee.

 

[Colin-S]

I'm having similar issues with my Cup.

It was raining very heavy the other day and the speedo just dropped to 0 mph when I was doing about 30mph and then 30 seconds later is went back to normal.

I was wondering if the rain had some effect on it as it was raining heavy at the time.

I've read it could be the wiring to the speed sensor on the gearbox or the sensor itself. Renault part no: 7700418919.

Your central locking is linked to a set mph, but if your speedo isn't working then thats also causing the auto door locks / central locking issue.

Use the link below to check the dials / instrument.

 

[chazza114]

It'll be your gearbox speed sensor, I had the exact same thing with my Phase 1. When the sensor stops reading and you lose the speedo, the ecu makes the car run slightly richer, that'll be why you're feeling it pick up a bit when the speedo doesn't work.

They're fairly cheap to buy ( https://renaultpartsdirect.co.uk/parts/transmission-parts/renault-speedo-sensor-7700418919/ ) and not too much of a pain to change, it just requires a fair bit of reaching down the back of the gearbox.

 

[npt]

Defo the sensor on the gearbox for sure

 

[the_baron_von_richthofen]

Most commonly the gearbox sensor but I had the same issue and it turned to be the wiring/plug going into the sensor.

You can get replacement plugs on ebay.

 

[Geewhite32]

Guys, thank you... very much appreciated.
Gee.

 

[Geewhite32]

Just one thing....is this what the lambda sensor from the cat plugs into?

 

[Colin-S]

Just one thing....is this what the lambda sensor from the cat plugs into?

The gearbox speedo sensor is a different sensor and plugs into the top of the gearbox.

You've got 2 Lambda sensors that plug into the exhaust - one before the cat (pre-cat) and one after the cat (post-cat)

 

[npt]

I had the same issues, new sensor on gearbox and its been fine since, remove wire, pull out in push other one in, takes no time, you could check power at the connection first, that's what I did and all was good

 

[Geewhite32]

Thanks guys, I have ordered one up.
Gee.

 

[Colin-S]

Thanks guys, I have ordered one up.
Gee.

Let us know if replacing it works. Cheers!

 

[Geewhite32]

New one fitted, so far so good. Will find out taking it to work tonight.
Thanks all for your help.
Graeme

 

[Colin-S]

Excellent news I've ordered a new one. Thanks!

 

[Geewhite32]

My mechanic friend was clearing codes for the ECU light. He fitted it while I was there.
Very tight, original one was still in.
He used a socket to loosen it first, it's not screwed in, just to help loosen it.
Might save a bit of arm tugging.
Gee.

 

[Colin-S]

Thanks for the tip, mine is the original one as well.
It must just be that time (around 20yrs) where a lot of original parts are starting to fail.

 

[Geewhite32]

Just a final update, speedo all ok now since changing the speed sensor. No more issues. Thanks all. Gee.

 

[rctempire]

Just swapped mine with the same issues. Pull out on one side harder and it popped out. Swapped over in 5 minutes or less.
Speedo now works. Hurrah.

 

[Colin-S]

Replaced mine yesterday, as it was defo on the way out,
speedo dropping to 0mph a couple of times while moving. Working now

 

[adamlstr]

When it doesn't work, your mileage on the odometer also doesn't increase, just sayin....