4AGE Distributor Question

aukword1
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4AGE Distributor Question

Postby aukword1 » Fri Apr 07, 2017 8:06 am

Hello,

Was wondering what wire on the distributor can be used as a Cam Sensor input that can go directly to my ECU to read the teeth on the dizzy wheel. Anyone have any ideas? I removed my igniter so maybe one of the wires on that plug can be used? Any thoughts are welcome!

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jondee86
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Re: 4AGE Distributor Question

Postby jondee86 » Sat Apr 08, 2017 2:19 pm

This is the basic wiring diagram for a typical 4AGE distributor (or CAS)...

Image

The 24-tooth wheel generates the Ne (rpm) signal, and the 1-tooth wheel generates
reset signals at 360 crank degree intervals. The kind of signal required for the ECU
depends on which ECU you are using. Aftermarket ECU's should be able to accept the
signal straight from the pickup. Later model OEM ECU's send all the signals to the
ECU which then sends signals back to the igniter.

Some older OEM ECU's send the Ne signal directly to the igniter which converts it to
a square wave and sends it to the ECU. This type of system will typically have a 4-tooth
wheel for the Ne signal and a 1-tooth wheel for the reset... like so...

Image

If you are running an aftermarket ECU with a trigger wheel on the crank for a rpm signal,
then you must have a reset signal from the cam if you want to run sequential ignition.

Cheers... jondee86
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aukword1
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Re: 4AGE Distributor Question

Postby aukword1 » Sat Apr 08, 2017 4:09 pm

I'm trying to use that 4 tooth distributor as the trigger wheel instead of the running a trigger wheel on the crank but my ECU needs to get a signal from the distributor so that it will read the teeth on crank rotation.

aukword1
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Re: 4AGE Distributor Question

Postby aukword1 » Sat Apr 08, 2017 6:43 pm

well looks like I will have to go with an EDIS4 setup unless I can find a 24 tooth distributor. Do you happen to know what year and model they come off of? its a 90-92 corolla right? I want to see if my local autopart's store might have one.

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jondee86
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Re: 4AGE Distributor Question

Postby jondee86 » Sat Apr 08, 2017 8:28 pm

Way back in aceforevers's forum thread (not build thread) he was up against the same problem
when his old Haltech ECU could not get a reliable rpm reading off the 4-tooth wheel. He solved
the problem by using the 4AGE igniter to condition the signal (convert from VR form to square
wave form) that the ECU could read. He had to change a few settings on the Haltech to get the
ECU to look for a digital signal rather than an analog signal.

Once he did that, the ECU was happy and the car ran fine. If you still have the igniter that came
with the original ignition system/distributor, you can use that.

Cheers... jondee86
Give a person a fish, they eat for a day. Suggest they search before posting, and they learn a skill for a lifetime.

aukword1
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Re: 4AGE Distributor Question

Postby aukword1 » Sat Apr 08, 2017 8:42 pm

Yeah I do have the original igniter but I tried that and still no signal. I am told that on my distributor the vr1 and vr2 sensors are configured in a way that it wont work with my ECU so my only options are to run and EDIS4, find a smallport distributor with a 24 tooth wheel or get a 4agze cam sensor. At least if I want to run COP's. The distributor cap and plugs get in the way of my turbo so it would be much nicer to either delete it fully or cut it down in half by using it as a cam sensor only.

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jondee86
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Re: 4AGE Distributor Question

Postby jondee86 » Sat Apr 08, 2017 11:38 pm

I think I saw somewhere that the US got some of these on the 4AGE...

Image

Not sure on which cars or what years (maybe AW11 ?), I'm sure that someone else
will know the details and let you know if they see this pic :)

Cheers... jondee86
Give a person a fish, they eat for a day. Suggest they search before posting, and they learn a skill for a lifetime.

aukword1
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Re: 4AGE Distributor Question

Postby aukword1 » Sun Apr 09, 2017 8:13 am

yeah thats the one I need right there. Hopefully someone will chime in on how to acquire one. Thanks jondee!

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