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Author Topic: Crank sensor wiring help!  (Read 1224 times)

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guru

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Crank sensor wiring help!
« on: 11 December 2007, 09:33:40 »

Hi guys!
hopefully you can help me out. Ive replaced the crank sensor on my Omega 99 Mv6 3.0 v6, and it has fixed my stalling problem.. most of the time.
Ive found the problem is actually a broken wire very close to the connector that connects to the sensor wiring.
My question is, where does this wiring run to? ie. Runs from the crank sensor, along the rear of the engine to pins 6,7,8 on the ECU?
I was planning on chopping a part of the cable up to the connector and replacing as much of the wiring as I can access, but then thought it might be easier to just run a new trace directly to the ECU, assuming you cant buy a part of the loom, eg just the connector and some wiring to repair it.

Also, is there any specific type of cable I need to use?
Cheers,
Ben
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Marks DTM Calib

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Re: Crank sensor wiring help!
« Reply #1 on: 11 December 2007, 09:40:24 »

If you route the cable as per our maintenance guide (i.e. NOT as per the original install), you should have 5cms or so to allow you to remove a short section.

The cable actualy runs from the rear of the engine bay, through the cable tray on the 2-4-6 bank (passenger side) and though the main loom to the ecu box and are not particulalry bound so acces to teh wires is easy.

The wire it self is 2 core screened (good balanced mic cable would do), pin 1 and 2 of the crank sensor are the signal wires with pin 3 being ground (from memory)
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guru

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Re: Crank sensor wiring help!
« Reply #2 on: 11 December 2007, 09:50:17 »

OK thanks a lot for this - I bought some 240v 3 core lamp wiring - not particularly heavy duty stuff thinking this would probably do the job, shouldnt have a high impedance, although does it need to be shielded in a particular way (like, is this giving some kind of a signal that needs to be particularly clean, or does it give just an on/off signal via a switched voltage?)

Cheers for your help!!
Ben
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Marks DTM Calib

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Re: Crank sensor wiring help!
« Reply #3 on: 11 December 2007, 09:55:35 »

It MUST be screened.....the ignition noise from the spark plugs/leads is pretty high and the crank signal is pretty low level.

You want something like this:

http://www.maplin.co.uk/Module.aspx?TabID=1&ModuleNo=128&doy=11m12
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guru

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Re: Crank sensor wiring help!
« Reply #4 on: 11 December 2007, 10:16:25 »

OK - champ! thanks.
Last question before i go running off to maplins, is the shield connected up as the third wire on the 3 pin connector that goes to the crank sensor? or are there three wires on the inside running through with a grounded shield?

Thanks
Ben
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Marks DTM Calib

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Re: Crank sensor wiring help!
« Reply #5 on: 11 December 2007, 10:19:45 »

The shield is connected up to one of the pins and serves as the 0V connection so the cable has two cores and a shield/screen and hence why balanced microphone cable is ideal.! :y.
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Re: Crank sensor wiring help!
« Reply #6 on: 11 December 2007, 10:26:58 »

Awesome. Like I said before, fast responses and you know what your talking about. Pure class all the way.

Cheers buddy
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