ECU & Speedo

[Roy]

Can anyone tell me where the speedo gets it input from. I know the dash gauge itself is electronic and comes from the ECU, but which engine/gearbox sensors allows the ECU to read road speed?

My prob is that my speedo isnt working. MY AVC-R is wired into the ECU and it too isnt displaying road speed, instead reads 00.

Coinciding with my speedo quitting, is that my steering got very heavy and after about 2-3kms the HICAS light came on.

My theory is that the HICAS light is coming on as a warning that the HICAS computer isnt getting a road speed signal. (I recall reading R32s have speed sensitive steering). The heavy steering is a result of the HICAS comp having no idea of road speed and is running home to mamma.

So back to which sensors allow the ECU to read road speed. Fingers crossed its a faulty plug, wire/sensor and after a simple fix all will be right. Thing is i need to know which sensor do i look at first.

Do modern cars still have spedo cables coming from the gearbox?

Thanks for any hlp you can offer

[Clint32]

im pretty sure the r32 has a mechanical spedo, not an electric one like a 33.

[Roy]

Cool, ill have a look at the gearbox in the morning

[aza]

have u got a wiering diegeram for the ecu

[aza]

try www.rb20det.com

[Roy]

Thanks aza

[Roy]

Replaced speedo cable and now as good as new. R32 GTR cable actually works with R32 GTSt as well.

and it would appear the steering drama was as a result of the Hicas/speed sensitive steering not having a speed input from the ECU.

[Roy]

How do i get this moved to Maintenance???

It may help someone out in the future.

[Clint32]

So the cable was the same as a 32 GTR one, that is good as i need to put a GTR speed sensor in my 33 gtst gearbox.

[Roy]

Shouldnt be a problem. No one wanted to sell me a 2nd hand cable out of a front cut for obvious reasons, and Nissan said a GTSt cable would be 2 weeks ex-Japan.

They sent out a GTR one and it did the trick.

[Bl4cK32]

Sorry to dig up an old one (seems to be a trend lately )

But i installed a r33 box in my r32. Now the speedo doesnt read anything, and the power fc hand controller isnt getting a speed reading as well....reads 00

My powersteering is also playing up big time as well

How did you end up knowing to replace the speedo cable Troy? Do i have to change the speedo cable to a 32 GTR one to get my speedo to work in the r32?

The speedo sender in the box is the r33 bottom with the gtr mechanical end on it. It and the r33 box was used in a previous r32 and both were working....

My speedo was working before the rb30det went in, with the rb20det and rb20det gearbox

[Roy]

I think Clints the man to speak to. Liek you said the R32 speedo is mechanical, R33 electric. Clint walked me thru it ages ago but i still havent had gearbox probs so not too concerned for the time being

[Bl4cK32]

The r33 box i have was put into a r32 and worked previously. Speedo and all. It has the modified speedo sender already in it...ie r33 bottom half with the r32 gtr top mechanical half.

So i thought it was a simple procedure of screwing my speedo cable in to get it to work, but unfortunatly it didnt work....

Clint....did you end up using a r32 GTR speedo cable in the r32 to get it to work, or is there something im missing???

cheers.

[R31 POWER]

I have the same prob with a R32 RB20det in my R31,it's all wired up but I have no speed showing on the PFC.BTW Mines electric not cable.....

[R31 POWER]

Bump and also the speedo in the dash works so what with that