K Series Crank Sensor lead?

[RogW]

Have just stumped the £'s for an Emerald and looked at fitting it, which should be a straight fit (EU2 spec car).

However, it seems, a prior owner to me, has put in place a fly-lead for the crank sensor (is going to a non-standard ECU currently). rather than going trough the standard loom. By the looks of it I can 'just' get at the previous wire in the main loom - they were cut off v close to the main loom shielding.

Question is - is it better to stick to the existing external option and somehow wire it in to the Emerald unit (probably via an extension loom lead) or link back to the previous, original wiring?

Research seems to point at the Crank Sensor lead needing to be shielded. 

Any thoughts? I am not breaking new ground - just wondering what folk have done previously.

Thanks in advance

Rog

[Ian Mackenzie]

Six and two threes if both are shielded, though if my memory serves me correctly the shielding should be earthed at the ECU end.

Cheers

Ian

[7 wonders of the world]

You can buy twin shield crank sensor cable on fleabay from brands hatch performance £2.50 /m plus shippingg.

or

Emerald do a prewired plug for £90 with all the ECU wiring in there,

I opted for a new bare plug and I'm wiring my complete car from scratch, the OE CC loom is far from a stunner !!

http://www.ebay.co.uk/itm/111611069787?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

 

[7 wonders of the world]

your correct with earthing, I will confirm pin numbers for all 3 cables for you in the morning

[RogW]

A follow on question on this - I now have the bits to make up a new lead. (Brands Hatch Performance were fantastic with delivery - excellent service)

Can anyone tell me on the crank sensor itself - which output is which? (ie which colour on the Caterham loom connects to which pin).

Currently it has one black and one white lead coming out of the connector plug, which is then connected to another plug and lead on which the wires are red and blue! So at the mo its 50/50 on getting it right!

If I get it wrong - is there any dramatic consequence if I turn the ignition etc on and spinning it up on the starter (apart from it probably not actually starting). Would the wonky way round wiring effect anything else? Or would it simply not start.

Rog

http://bladecomms.com/samples/Crank.jpg

http://bladecomms.com/samples/Crank.jpg

[revilla]

Standard EU3 Wiring:

Pin 1 - Blue/Purple - To ECU Pin 4 "Crank Position" (EU2 Pin 31 "Crankshaft Position Sensor +ve")
Pin 2 - White/Blue - To ECU Pin 30 "Crank Negative" (EU2 Pin 32 "Crankshaft Position Sensor -ve")
Screened Cable, Screen to ECU Pin 17 "Crank/Cam Screen" (EU2 Pin 29 "ECU Earth A").

Wire Positions: