Intermittent Speedo

[Tommo]

I have a problem with my speedo, it's only working every now and then. One minute it's working fine then it drops off to zero(usually approaching a speed camera). Not sure where the speedo pick up point is located, Is it on the gearbox? Need to sort this quite soon as my MOT is on the way and russian roulette with the cameras is not doing my nerves any good.

Cheers for any help

[eXOBeX]

Could be the speedo pickup, could be the speedo itself. If you manage to locate the pickup (should be on the gearbox), try running a wire from it to a frequency counter (or multimeter with an RPM or frequency range). Drive around a bit. When the speedo drops have a glance at the counter to see if it's stopped too. If it has, it's the pickup. If not, it's the speedo or the wiring - repeat the test with the wire connected to the back of the speedo to determine which.

[Tommo]

Cheers, I'll give that a go at the weekend and let you know how I get on.

[ColinBarber]

Probably more to do with a faulty, or poorly fitted, speed convertor seeing as you have an Altezza.

[Sirnixalot]

... and russian roulette with the cameras is not doing my nerves any good.

Cheers for any help

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I completly sympathise with your problem & dont know why but that made me laugh.

The speed sensor is on the gear box. I'll see if i can snap a pic of it tonight.

[Tommo]

Probably more to do with a faulty, or poorly fitted, speed convertor seeing as you have an Altezza.

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Where would I find the speed convertor so I could check it out and would you know how to test it. Would it just be a set resistance?

Too many questions sorry

[Monster-Mat]

the converter could be anywhere......

but try starting the search behind the instrument cluster, then either foot well fuse box areas(you will need to remove the kick panels)

[ColinBarber]

Where would I find the speed convertor so I could check it out and would you know how to test it. Would it just be a set resistance?

Too many questions sorry

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No you cannot test it like that. It has electronics in it to divide the number of speed pulses to give the correct output in mph.

If you can locate it then check the connections have been made correctly.

[Tommo]

Ive had the speedo cluster out a couple of times before and never noticed it behind there. So I'll try the kick panels first. what would it look like?

Cheers for the advice.

[Monster-Mat]

the ones ive ever fitted have been a little square o round chip looking part with either 3 or 4 wires coming from it