AEM Ultimate Resource Thread>>>>

[mjannusch]

Originally Posted by Davey07

AEM map sensors:
The black MAP sensor wire can be t'd into the black tps wire (ground). The green wire goes to the ECU EGR pin for your model year (53 or 73). The red wire can be t'd into the green/yellow striped tps wire (+5v). The vampire taps shown below are NOT recommended but are only shown for example purposes (in this case when the aem was just being tested and then removed).


Question the green wire where exactly does that go? run a wire through my firewall or what?? understand everything cept that wire.. thanks guys Dave, oh and if i took off my egr do i even need to do anything with this wire.??

The green wire needs to go to the connector that your EGR sensor used to connect to by the rats nest of vacuum lines on the firewall. I forget what pin if there are multiple pins in that connector, and my car isn't real accessible at the moment. The AEM won't use the EGR sensor for anything, since it is using that signal wire for the MAP sensor.

[Davey07]

Originally Posted by mjannusch

The green wire needs to go to the connector that your EGR sensor used to connect to by the rats nest of vacuum lines on the firewall. I forget what pin if there are multiple pins in that connector, and my car isn't real accessible at the moment. The AEM won't use the EGR sensor for anything, since it is using that signal wire for the MAP sensor.

so i don't even have to hook up the green wire...? Ya i took out all that crap against the firewall. theres still i know one connector left( just laying there ) so tap into one of those wires not sure which one? correct?

[mjannusch]

Yes, you need to hook the green wire to the ECU side of the factory EGR wire that you unhooked when you removed your EGR valve/sensor assembly.

You can determine which wire to connect to at the EGR connector by using a multimeter set to measure ohms and connect it to the right pin at the ECU and then hook the other end to one of the wires at the EGR connector. When you find the right one, the meter will show 0 ohms or very close to zero. Otherwise, look at the wire color at the ECU for that pin and see if there's one at the EGR connector that matches the colors.

[mjannusch]

Wait a sec... You are putting it in a '99 VR4? Did you swap the engine harness or whatever the heck you need to do in order to put an AEM in a '99 car? It isn't plug-and-play in a '99 as far as I know.

[Davey07]

Originally Posted by mjannusch

Yes, you need to hook the green wire to the ECU side of the factory EGR wire that you unhooked when you removed your EGR valve/sensor assembly.

You can determine which wire to connect to at the EGR connector by using a multimeter set to measure ohms and connect it to the right pin at the ECU and then hook the other end to one of the wires at the EGR connector. When you find the right one, the meter will show 0 ohms or very close to zero. Otherwise, look at the wire color at the ECU for that pin and see if there's one at the EGR connector that matches the colors.

so i check continunity between one of the pins on the connector that i pulled out my egr connector, to what???( you said right pin, what pin is that?) and the correct wire is the wire with no resistance? That doesn't make any sense to me. Wouldn't it be the wire that has contunity, cuz if it doesn't, where does the wire go to? Or is this just the process of elimination because the other wires have resistance between those and the "right pin" and correct wire from the connector doesn't have resistance, but has resistance with another wire.. and then this wire needs to be connected to the green wire?? I'm confused thanks again..

yup ips , they made me a custom harness" plug n play" Haven't received it yet, and i also don't know which year they use.
Its kinda like a boomslang harness thats located right at the ecu. one has a 99 side , and the other has a male connector thats compatiable with aem ems. Vr4 me did a hell of a good write up on it, but i decided i didn't wanna spend all that time soldering cuz I suck at it. I would never attempt to swap out an entire harness that would be mega time consuming/expensive

[mjannusch]

Originally Posted by Davey07

so i check continunity between one of the pins on the connector that i pulled out my egr connector, to what???( you said right pin, what pin is that?) and the correct wire is the wire with no resistance? That doesn't make any sense to me. Wouldn't it be the wire that has contunity, cuz if it doesn't, where does the wire go to? Or is this just the process of elimination because the other wires have resistance between those and the "right pin" and correct wire from the connector doesn't have resistance, but has resistance with another wire.. and then this wire needs to be connected to the green wire?? I'm confused thanks again..

Continuity = no resistance

I don't know what pin on the '99 harness is EGR temp, so I cannot tell you what pin to trace. I don't have a '99 service manual.

You need to find continuity (no resistance) between the EGR signal wire at the ECU and the EGR connector in the engine compartment. That line will hook to the green wire on your MAP sensor.

[Davey07]

continunity something will show up , because every wire has some resistance when current passes through it... OL will show up if there no resistance. or theres an open...correct?

[Davey07]

actually i'm 100 percent sure, cuz thats basic elecrtical, thats all we did last quater is test diodes, relays and transistors..

[mjannusch]

"OL" is "overload", or more ohms (resistance) than the scale your meter is set to can display. For example, if a wire and the associated components connected to it had a resistance of 500 ohms, and your meter was set to display zero to 250 ohms, when you measured it then you would see "OL" which means that what was read was higher than the scale your meter is set to. An open circuit is "infinite" resistance, and will always display "OL".

Make sense?

[Davey07]

Originally Posted by mjannusch

"OL" is "overload", or more ohms (resistance) than the scale your meter is set to can display. For example, if a wire and the associated components connected to it had a resistance of 500 ohms, and your meter was set to display zero to 250 ohms, when you measured it then you would see "OL" which means that what was read was higher than the scale your meter is set to. An open circuit is "infinite" resistance, and will always display "OL".

Make sense?

yes i 100 percent agree with you! with the statement above!!!