[Diy_efi] RE: Nissan KA24E ECU and CAS

Tue May 9 03:29:17 UTC 2006

Interesting, this is rather different to the RB30 unit which
has the same gaps per cylinder except tdc, I'll find my
analyser traces somewhere - which show the pulse shape
and number of pulses overlap to distinguish tdc from other
cylinders. With the RB30 unit there are often reports of damage,
unfortunately the EHT leads can lie against the CAS leads
and any corona discharge (not a spark but a field effect) can
impress noise on the signals - make sure you have a good
separation between leads and check your ground connection on
the CAS. On the RB30 unit there is an extra ground wire which
goes to a spade on the body of the unit. it doesnt rely on the
interface connector alone.

rgds

Mike

At 02:20 AM 5/9/06, you wrote:
>Here is a picture of the RB26 disc which looks pretty similar.
>
>http://www.sol.co.uk/h/hugh/Motec/RB26%20Trigger%20Disk.JPG
>
>I have a great deal of noise on my RPM trace and assume that it it caused
>by cambelt harmonics probably made worse by high lift cams.
>
>Cheers
>
>Hugh
>
>Just email them to me Tom, my email address should be on the
>top of your header, if not then here  niche at iinet.net.au
>
>cheers
>
>mike
>
>
>At 03:02 AM 5/6/06, you wrote:
>>How to mail a pic? I assume attachments will be stripped, so there's an
>FTP somewhere?  I just took pics, not awesome ones, but between John's link
>and the pics, some useful info should be gleaned.  In case it doesn't come
>through, there is a fat slit in the CMP (sorry for the ISO terms vs. Nissan
>ones, it's a habit!) portion of the wheel, which identifies cylinder #1.  I
>have had an oil-fouled interrupter plate not fire the injectors every time
>the blocked hole came around, so I know the inner ring of holes is used to
>trigger the injectors.
>>
>>TomV
>>
>>Mike wrote:
>>
>>>Suggest email us a picture, because this sounds so much like the
>>>RB30 CAS and I have done a study of that one, there is no cam
>>>control but there are two lots of pulses which overlap to signal tdc...
>>>
>>>rgds
>>>
>>>mike
>>>
>>>
>>>
>>>At 12:00 AM 5/5/06, you wrote:
>>> 
>>>
>>>>1. Yup.  Fought one for a while; dealt with the same problem on an
>Altima, and similar problems on the VG30 which has the same setup.
>>>>2.
>>>>3.  No extra or missing slits; the 360 slits are actually for the crank
>angle sensor and the four slits, spaced inboard of those, are for the cam
>sensor (cylinder ID,) with one being wider then the others.  The signal
>conditioner makes the outputs into square waves.  There is no dead space in
>the ring of 360.
>>>>
>>>>
>>>>John Smith1882 wrote:
>>>>
>>>>   
>>>>
>>>>>1. Do you know that for sure?
>>>>>2. n/a
>>>>>3. I know all about the sensor except what the conditioning circuit
>does. Does it just "clean up" the rounded square wave signal from the
>optical sensors, or something else? On the 360 slots, is there a dead space
>like the #1 injector window?
>>>>>
>>>>>
>>>>>     
>>>>>
>>>>>>Date: Wed Apr 26 15:48:43 CDT 2006
>>>>>>From: Tom Visel five10man at commspeed.net Subject: RE:Nissan KA24E ECU
>and CAS
>>>>>>To: diy_efi at diy-efi.org
>>>>>>
>>>>>>
>>>>>>1. ECU will get all sorts of stupid without CAS.  Anything from not
>running at all to limp-in.
>>>>>>2. Don't know.
>>>>>>3. 360 slots, photocoupler-read, conditioning circuit inside the
>distributor.
>>>>>>       
>>>>>
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>>>
>>>
>>>
>>>Regards from
>>>
>>>
>>>Mike Massen
>>>Network Power Systems
>>>Lab 08 9444 8961
>>>Mb 0438 048961
>>>Perth, Western Australia
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>
>Regards from
>
>
>Mike
>Perth, Western Australia
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Regards from

Mike
Perth, Western Australia
VL Commodore Fuse Rail that wont warp or melt !
Twin tyres for most sedans, trikes and motorcycle sidecars
http://niche.iinet.net.au