AEM Pinouts

[mb3000]

Ah OK. I don't own a first gen, obviously.

Lucky bastard

[Tigchamp]

Not exactly. First, this is an output function, so in this case you want to use an LS driver that grounds a relay for your SMIC fans.

It's not quite that easy though. At the risk of getting too in-depth: the AEM has some limitations, one of which is that you can't just arbitrarily assign conditions to output drivers. For "general purpose" outputs, you're stuck with the parameters they provide, which are RPM, Load, TPS, Road Speed, and Coolant Temp. So you can say things like, "Activate this pin when RPM > 6000 and Load > 10", but not "Activate when AIT > 150".

For your purposes that's probably fine, since high AITs are pretty much going to directly correspond with high load, RPM, and/or coolant temp.

Thanks for Your answer.
In this instance I would probably be left with RPM or road speed, as the main reason for the fans would be whilst at idle to 1500 revs to stop heat soak whilst stationary or driving slow, as unlike a FMIC there will be no engine cooling or AC fan to draw cool air through the intercoolers.
Jeff

[Tigchamp]

Not exactly. First, this is an output function, so in this case you want to use an LS driver that grounds a relay for your SMIC fans.

It's not quite that easy though. At the risk of getting too in-depth: the AEM has some limitations, one of which is that you can't just arbitrarily assign conditions to output drivers. For "general purpose" outputs, you're stuck with the parameters they provide, which are RPM, Load, TPS, Road Speed, and Coolant Temp. So you can say things like, "Activate this pin when RPM > 6000 and Load > 10", but not "Activate when AIT > 150".

For your purposes that's probably fine, since high AITs are pretty much going to directly correspond with high load, RPM, and/or coolant temp.

So for this I would conect a LS Ground output to the ground terminal of a relay to switch on the fans?
There are a few available LS, Output, switched ground 1.5A, would this be the corect ones to use?
Does the amount of current being drawn from the relay affect the ground in any way?
Jeff

[Intropy]

Yes, you connect the LS output to the relay ground (the coil ground, obviously). You should never exceed 1.5A, which you won't because all you're hooking up is a relay.

[Tigchamp]

Yes, you connect the LS output to the relay ground (the coil ground, obviously). You should never exceed 1.5A, which you won't because all you're hooking up is a relay.

Thanks for Your help, I have just spent the day figuring out all the pin outs for the CDI & COPS, two EGT sensors & the WI, this should be the final conection that I need to make, Phew!
Jeff

[Tigchamp]

Questions dont get any more basic, and probably more important.
I am not convinced that I understand: "As viewed from end of EMS"
This is the "C" plug, is the top right pin as you see it, 80 or 85? (91-93)

[J. Fast]

[QUOTE=Tigchamp;152262]Questions dont get any more basic, and probably more important.
I am not convinced that I understand: "As viewed from end of EMS"
This is the "C" plug, is the top right pin as you see it, 80 or 85? (91-93)


Top right pin is pin # 80. When you plug it into the EMS that will be on the top left.

[Tigchamp]

Thanks, Matey.
That means that I have done it right.
I keep convincing myself that it is right then the next minute I doubt myself LOL
Jeff

[fastfalcon94]

Bumping an old thread because it's the only thing useful I can find on here about it. Did you get any of the Low Side or High Side pins working? I need v2 aem to trigger a relay (it can either use high side or low side, doesn't matter) under a certain boost condition. This is for a 94 vr4. AEM only lists pin 43 as being HS#4 which is the only high side listed. My 94 vr4 does not have a wire at this location. I tried adding one from a spare ecu pigtail I had but it's not working. I configured the output to "General Purpose" and set it to activate with TPS at least 10% for testing purposes. I enabled the pin. In AEM I can monitor it and see HS#4 activating if I press on the gas pedal. But voltage measured at pin 43 is in mV. It's not getting 12volts like it should. I think the aem diagram is wrong.

So I went through some other potential pins, and I can't come up with anything. The only wire that was actually present and available for me to use was the maf reset. However I tested that and it doesn't see ground at all when a condition is met. Again I think the aem pin out diagram is not correct. If either of you got any output working, if you could let me know the pin I would really appreciate it.

LS# 11 - fuel pump can't use this
LS# 4 - evap can't use this
LS# 8 - maf reset. Wire is here, but tested it and does not force continuity to ground when conditions are met
LS# 9 - rad fan high can't use this
LS# 2 - rad fan low can't use this
LS# 6 - a/c switch can't use this
LS# 10 - Check Engine light can't use this
LS# 1 is pin 39, no wire on factory 94 vr4 harness here
HS# 4 no wire on factory harness here, still tried wiring it up, doesn't get 12v when condition is met
LS# 3 is pin 51, no wire on factory 94 vr4 harness here
LS# 5 is pin 55, no wire on factory 94 vr4 harness here
LS# 12 - ac clutch slip input can't use this
Injector 11 is pin 60 no wire here on factory 94 vr4 harness
injector 7 is pin 46 no wire here on factory 94 vr4 harness

Thanks - Charlie