[Diy_efi] Nissan KA24E ECU and CAS

Tom Visel five10man
Wed Apr 26 20:48:43 UTC 2006

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.  4 more slots, also read by a photocoupler, with a 
conditioning circuit inside the distributor.  Subject to fouling with 
oil if the distributor bushing is loose.  Altima uses the same 
electrical setup but mounted to the back of the head, and is easier to 
find in the JY for testing purposes.


John Smith1882 wrote:

> I have a TB, MAF, injectors, fuel rail, ECU,etc from an '89-90 Nissan 
> 240SX that I am going to be adapting to another engine. The crank 
> angle sensor(CAS) and injector trigger are in the distributor, but  
> that is the one part of the systemI do not have. The CAS is, from what 
> I understand, mainly for ignition. The ignition will handled separate 
> from the ECU. I still need the injector trigger wheel, though, and I 
> can build that.
> My qestions are:
> 1. Will the ECU still funtion without the CAS, or will it go into 
> "limp" mode?
> 2. If I cannot remove it, does anyone know if I can remove the CAS 
> function in the binary file?
> 3. If I can't do either of those, does anyone have a clear picture of 
> what the trigger wheel looks like? All I have is a bad illustration 
> from an online factory service manual.
> I have been all over the net looking and even the Nissan 
> tuners/chippers/programmers can't help for whatever reason.
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