AEM and CPS help PLEASE

p5150

p5150

ASE and FAA A&P Certified
Mar 31, 2005
1,176
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36
Central Idaho
Im running the MKIII CPS with a 1100 AEM box and im having some problems. Once I solve them i will type up the solution to share.... Basically, when I crank over the motor, I am getting no spark.

I am running a C2DI AEM ignition box and I have wired up as follows:

55B (Ignitor 3) - coil 3
56B (Ignitor 2) - coil 2
57B (Ignitor 1) - coil 1

The CPS has 6B (G1-) and 7B (Ne-) connected. G2/5B is not connected because it is "not used". 26B (G1) and 27B (Ne) are connected but G2/25B is not connected.

I am getting a signal (as viewed through the "scope" option of the parameters window of the advance cam/crank sensor options) for the crank (Ne) but it doesnt look like im getting a signal for the cam (maybe there isnt a scope indication for it?)


I saw that secretSC (gadgetSC) was running the vvti coil packs and ignitor and that he was feeding the IGF signal back into the aem via pin 58B. I think that another guy was feeding the IGF back into the G2 signal 25B. However, I am not using the stock ingitor, so I dont really know if the IGF signal is something I can get from somewhere else because I dont know what it is or the format of its output. Do you think I can just use the tach out of the AEM C2DI in place of the IGF signal?

Also, when checking timing with the coil packs are you guys using a jumper wire from the plug to the coil pack for an inductive timing light or are you just clipping the inductive light pickup onto the wire feeds into the pack from the CDI/Ignitor? Im not sure if there will be enough voltage for the light to pick up on because I have never checked timing on this setup. Thanks.
 
Shadow

Shadow

87 1JZ-GTE Single Turbo
May 25, 2005
304
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Windsor, Ct
The only thing that stands out to me is the cam sensor. If it isn't working right, you won't get a good spark. I'd look into making sure that's working correctly and go from there.
 
RacerXJ220

RacerXJ220

Interdimensional
Mar 30, 2005
1,504
0
0
Abalama
I swapped setups from the stock 7M coils to the 1J coils. I used a timing light on their respected feeds (plug wire for 7M, lead wires to 1J coil 1) just fine with no problems. There was enough voltage with mine. I was using the MSD DIS-4 both times.

Try the tach out, shouldn't blow anything up. You're getting ready to fire this thing up!!! YEAH!!!
 
p5150

p5150

ASE and FAA A&P Certified
Mar 31, 2005
1,176
0
36
Central Idaho
I dont think its the cam sensor - I think its the lack of pin 58B feeding back into the AEM which is the IGF signal from the stock ignitor. Since I have a CDI the AEM doesnt see this signal. I think the AEM uses it to verify its timing pattern before sending a spark signal.
 
p5150

p5150

ASE and FAA A&P Certified
Mar 31, 2005
1,176
0
36
Central Idaho
Well I just got off of the phone with AEM, and they said that it is not related to 58b. Not quite sure if I believe that but anyway.....

Also, Stat Sync comes on when I crank the engine so it is definately getting a signal from the CPS from both the Ne and G1 sensors. I also have the correct resistance measured through the circuit of G1. I didnt bother measuring NE because the EMS shows it on the scope.
 
p5150

p5150

ASE and FAA A&P Certified
Mar 31, 2005
1,176
0
36
Central Idaho
IJ - thanks for putting that in bold so that I could really see it.

The air gaps are about .002 over the MINIMUM spec so they are well within limits. Additionally, the stat sync parameter comes on so I know that the AEM is getting both signals and that they are correctly synchronized.

I think the problem lies somewhere with the config of the AEM. I just did a manual check of the C2DI and it works very well so I know that it is not to blame.

I do not know what type of signal the IGF signal from the stock ignitor is. The CDI is a 12v square wave... Maybe I need to replicate the IGF signal for the AEM with some type of adaptor?
 
I

IJ.

Grumpy Old Man
Mar 30, 2005
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I come from a land down under
Damn!

I looked at em when v 1.0 was around and gave it a miss after reading the AEM forums but thought they'd fixed the issues. (guess not)

P5150: Try wiring it without the CDI and see if it'll run.
 
Rich

Rich

tunin' tha beast
Jun 2, 2007
319
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the netherlands
In the 2jzgte tsrm ('95 version) from page EG-519 and further it is described how this igf signal works (voltage: 4.5-5.5V, signal type, when it occurs etc.).
It's the troubleshooting part of the tsrm.
 
I

IJ.

Grumpy Old Man
Mar 30, 2005
38,728
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I come from a land down under
5150: I'd try it Batch Fire with an ignitor and make sure it will run like that to verify it's the CDI.

It's a bit more screwing around but at least you'll know for sure.

I had a few issues getting the MoTeC to run and it's very easy to lose track with so many variables.
 
p5150

p5150

ASE and FAA A&P Certified
Mar 31, 2005
1,176
0
36
Central Idaho
Not having the stock ignitor after the AEM and before the c2di has to be my problem. Im leaning towards the C2DI not recognizing the signal from the AEM. The AEM tech explained it to me like this:

The toyota signal is a floater - basically it is a very small change to signal on/off (2.5 to 4v). The C2DI is looking for a much larger signal like a falling or rising wave. (0-5v or 5-0v). Basically I need to figure out a way to make the output look appropriate for the C2DI or put it in a format that it will recognize.

http://forum.aempower.com/forum/index.php/topic,8680.0.html

This post talks about modifying the AEM so that it will pull to ground. I shunted the terminals like DaveH and the AEM guy talks about but I still could not get the c2di to fire. Dammit. I think that next I will try to re-install the transistors and wire it to ground like the pictures say to.

Updates to follow.
 
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p5150

p5150

ASE and FAA A&P Certified
Mar 31, 2005
1,176
0
36
Central Idaho
I need to get an oscilloscope to see what the wave output is on the channels for the AEM. Does anybody have any recommendations?
 
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