Standalone ECU questions.

[Bleu]

I hope that some of this stuff is very similar/exactly the same as an AEM. I have an old G1 Link Plus ECU and was curious if someone on here could help me figure out how to tune with it and make sure everything is hooked up correctly. I know someone here has ran this computer before. I have a few question so I guess I'll just list them out.

1. My IAT sensor is only reading 220 and I'm fairly certain that's not right. Should I have the IAT wired into the IAT part of the MAF (I'm running speed density) or does it need to be wired in to the computer directly?

2. When I started the car and managed to figure out how to record a log I noticed there was knock and knock count. What's the difference?

3. I have a wideband O2 sensor. Specifically its a LM1. How do I wire that into the ECU? There's only 1 wire for O2 if I recall and the analog out has 3ish wires. Should I only use 1 of them?

4. If anyone on here is fairly advanced when it comes to tuning or at least has a better idea about it than me, can I send some logs and the LINK PC program? I'd like to try to get a general idea of what is going on with the motor.

Hope that you guys here can help me get this all situated. I know I'm asking a lot. :D

(Yes this looks very similar to the post I made on the gtoperformance website.)

[mb3000]

220 is not correct, so I'm guessing you would wire it directly to the ecu.

Knock and knock count may refer to the voltage from the sensor, and then the stock reported values.

There should be an input on the ECU for a wideband O2. Check your manual for the LM1 for a 5v output wire, and that would most likely wire directly to the ECU.


Sorry I can't be of more help, but I've never even heard of the ECU you're using.

[Bleu]

Haha, yea the guys in New Zealand have heard of it but have never used it on a Stealth. I recently learned what to look for on the LM1 to get it wired in and that will be a nice addition for the computer. I've been looking into the IAT thing but can't seem to find my problem. I'll keep people posted.

[ICPREY]

The IAT wires for my AEM are wired at the MAF wiring.

[mb3000]

Look at the AEM wiki install. It tells you what MAF wires to use. Although it is wired up there, it is not the factory "AIT" wire IIRC.

[ICPREY]

3000GT/Stealth AEM FAQ (http://mjannusch.3sg.org/)

[Bleu]

Look at the AEM wiki install. It tells you what MAF wires to use. Although it is wired up there, it is not the factory "AIT" wire IIRC.


That makes a bit of sense. I'll check that FAQ out. I thought I had it figured out by looking at the diagrams, guess I was wrong.

EDIT: I think I have it wired into pins 5 and 6. I'll get back to ya'll about that. Thanks

[mb3000]

3000GT/Stealth AEM FAQ (http://mjannusch.3sg.org/)

You'd think I would remember that, considering I wrote that part :lol:.

[Bleu]

If you are installing a GM AIT Sensor, wire the sensor to pin 6 (black wire, ground) and pin 7 (red/blue stripe, signal) of the stock MAF connector.

That's not your quote but its from the install guide.

I have my sensor wired into the black wire and the red with blue striped wire IAW the TO. The problem I have though is that on my car, a 91 dodge stealth, Pin 5 is Black. Pin 6 is red/blue. Pin 7 is solid red. I have mine wired into pins 5 and 6. Should it be 5 and 6 or 6 and 7?

I have the wiring diagram of my car saved as a picture. I need to upload it to image bucket and try to EDIT it into this post.

[mb3000]

Whatever is written in the guide is what I used with my '92 VR4, and my AEM install went flawlessly.

That guide is also copied from the 3si wiki, which is what I contributed to.

Edit: It sounds like you just tied into the wires. IIRC the wires need to be cut and fed by your new sensor only.

[Bleu]

Maybe I used the wrong wiring terminology. I don't work with electricity too much, sorry. What I mean is that my red and black wires for the IAT sensor are butt connected to the wires that were going to the MAF. I have it hooked to the black and the red/blue wires. Its just in your guide you say the solid black and the red/blue, but those are not pins 6 and 7 they're pins 5 and 6.

I guess I was just curious if the pin number was correct or if the wire color was correct. Maybe I read the wiring diagram wrong.

[mb3000]

Under the "How do I install the AEM EMS in my car" subsection,

AEM Engine Management System (EMS) FAQ - 3SI Wiki (http://www.3si.org/wiki/index.php?title=AEM_Engine_Management_System_%28EM S%29_FAQ&printable=yes)

Have you ruled out the sensor itself for the odd reading?

[Bleu]

I guess I could buy another to try but I'd rather not... I'll check my tuning software and see if there is a voltage scale that needs adjusted first and then I'll look into buying another.

Or is there a way to test a sensor like that?

[ICPREY]

http://www.youtube.com/watch?v=FlQ-aGL0upA

[Bleu]

Thanks for the how to. I feel really stupid I didn't think of that since I knew it was a resistance based circuit. Sadly the sensor checks out to be functional. I'm going to have to dive deeper into my wiring now it looks like or wire it into the ambient sensor section of the ECU.

[Bleu]

Also, does anyone know where to go if the MAF harness connector isn't getting juice?

[mjannusch]

"You'd think I would remember that, considering I wrote that part."
That guide is also copied from the 3si wiki, which is what I contributed to.
Not to nitpick, but I wrote that AEM FAQ years before the Wiki even existed, a few months after the AEM was released for the 3S. So thanks for posting it and saying it is your own.

[mb3000]

^ I did not say I wrote it, I contributed to it by correcting some of the information that was wrong. In specific, the wires that are used for the AIT wiring. I guess your post was copied over to the 3si wiki, where I later corrected that specific part. If you'd like I can just put the incorrect info back in?


I never said that I wrote the guide.

[Bleu]

Just an update for anyone who invested time in helping me out I figured out the IAT problem. The way it needed wired was different from an AEM. I now have an active IAT sensor. I think I juest need to lean it out a tiny bit and then let the wideband sort out the AFR once it warms up.

Just need a wee bit more exhaust on it so the O2 reads right.