Speed sensor on the gearbox, is it Canbus? or direct pulse?

[ben_p]

I have removed the renault ECU from my car. I now just run a Omex 600 with custom loom.

My car is a psh1 so i have a pencil sensor in the gearbox for roadspeed (off final drive)

How can i wire this to the clocks to bypass the old renault loom that I removed? Does it go though CanBus i.e does the signal from the sensor need de-coding to the run the speedo?

f**king Renault.

 

[Matteh]

iirc, the speed sensor signal wire splits into 2 and one goes to the ecu and the other to the clocks, though I can't remember which pin

it's just a +12v pulse, once every 0.2m iirc

 

[ben_p]

sweet, so just direct then?

 

[Matteh]

yep, should be

 

[ben_p]

Sweet. Why does it go into the ecu too? I could just meet the wire up at the firewall conection block. I know which pin is speed (white wire)

Does it need grounding!?

 

[bmh.01]

Lower limiter in 3rd, 4th and 5th as standard so might be for that?

 

[ben_p]

yeah or could be for the fan?

Thoughts on grounding?

 

[Matteh]

it controls the fan speeds and the limiter... I think it controls fueling or something too, as mine behaves differently with it unplugged (esp on overrun), though it might just be a placebo effect

the sensor needs 3 wires, yellow is an ignition live, black is an earth and the white wire is your signal wire

 

[ben_p]

sweet, can i just spit a iginition live that is near to the sensor and run it off that

 

[Matteh]

don't see why not

I think it's original power supply comes from the input to the fuel pump relay

 

[ben_p]

matty, how much to drive down and wire my new loom in?

 

[Matteh]

lol, long way from London

 

[ben_p]