Hey,

 

Bloody speedo isn't working again!

 

It's not a converter problem, as I took that out last time the thing stopped working and then it was OK (until now)

 

So.... it's either the auto box sensor or the dial itself.

 

Now I reckon it's the auto box sensor because the steering is all heavy and the HICAS light comes on, plus the car keeps pulling back under boost now. Those things are dependent on the pulses from the auto box aren't they? Not the dial itself?

 

Anyone got any ideas on that one?

 

Cheers,

 

Christian

Hi Mate,

Your dead right, it's the speed sensor on the gearbox. You shouldn't drive it really because the HICAS doesn't know what's what and can turn unexpectidly.

 

Cheers,

 

Steve.

the speedsensor signal goes directly to the speedo dial and the electronics in the dial convert the signal into a pulse signal which is then send to all ECU's

 

In a lot of cases the cause of non or intermittent working speedo's is caused by tiny cracks in the solder joints on the speedo board.

Resoldering the joints solves the problem (in most cases)

 

Also before you start replacing the speed sensor it's best to measure it's signal at the speedo with a multimeter first (signal is an AC voltage)