AEM v2 ECU wont connect unless benched off the car?? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

R3b · 03-29-2019, 02:21 PM

Whats up guys have an usual issue. Picked up a V2 from my buddy was working fine on his car and when I went to do a basemap and get into AEM tuner. I had nonstop issues trying to get my laptop connect. Checked everything from comport settings to usb, different windows OS, etc and nothing.

Went and probed and checked my harness and nothing. Then I benched the ecu off the car, gave it power and would connect instantly through comport or USB..... Next thing I did was put it on the car and started disconnecting my sensors. It was until I disconnected my maf and dizzy which share a B/W power wire coming from the chassis did the ecu finally connect on the car. Soon as I plug both in the ecu instantly disconnects. Wiring harness is fairly new wiring specialties harness. My engine is a KA24de boost, made 467whp on stock ecu e85 after I couldnt get my aem to work on my dyno day.

Any ideas? Possibly its something internally wrong with my ecu and friend hurt the ecu before selling it to me? I assumed it was noise somewhere in my harness and sold it to another guy, he had similar issues, refunded him and now have the ecu back. Is there anything I should do besides sending it in to get checked out? Way back I spoke to a rep and they said if I can bench the ecu then it should be fine but then I emailed someone from tech recently and they said to send it in to diagnosis if its working or not then charge again for whatever needs to be fixed.

tuzzio · 03-31-2019, 07:46 AM

When you click connect, does it show the box that says "connecting" (or whatever, its been a while..)

Mine won't connect until I cycle the the key to off, and back on. I think its a safety feature.

R3b · 03-31-2019, 11:24 AM

Quote:

Originally Posted by tuzzio

When you click connect, does it show the box that says "connecting" (or whatever, its been a while..)

Mine won't connect until I cycle the the key to off, and back on. I think its a safety feature.

I cant remember exactly but I do remember trying the key cycle click a million times when I was looking through forums. AEM forum is useless for help, even facebook groups. Then when I contacted AEM i've got two different answers. One was if I can bench it off the car then ecu is fine and recently they said I need to send it in.

I got the ecu fairly cheap but id rather not pay 100 plus shipping for them to tell me its fine and be at square 1 trying to figure out something in my harness is the issue.

Jfornachon · 04-01-2019, 10:43 PM

It sounds like something is shorted int he ecu! It would be cheep insurance to make sure that you have a factory perfect ecu going in. If they find more wrong or have an update they can take care of it at that time and you can kill 2 birds with one stone. On the other hand if they guy sold you a bad ecu that's fucked and would be talking to him about it.

03-29-2019, 02:21 PM	#1
R3b Zilvia Junkie Join Date: Mar 2015 Location: South FL Age: 27 Posts: 581 Trader Rating: (0) Feedback Score: 0 reviews	AEM v2 ECU wont connect unless benched off the car?? Whats up guys have an usual issue. Picked up a V2 from my buddy was working fine on his car and when I went to do a basemap and get into AEM tuner. I had nonstop issues trying to get my laptop connect. Checked everything from comport settings to usb, different windows OS, etc and nothing. Went and probed and checked my harness and nothing. Then I benched the ecu off the car, gave it power and would connect instantly through comport or USB..... Next thing I did was put it on the car and started disconnecting my sensors. It was until I disconnected my maf and dizzy which share a B/W power wire coming from the chassis did the ecu finally connect on the car. Soon as I plug both in the ecu instantly disconnects. Wiring harness is fairly new wiring specialties harness. My engine is a KA24de boost, made 467whp on stock ecu e85 after I couldnt get my aem to work on my dyno day. Any ideas? Possibly its something internally wrong with my ecu and friend hurt the ecu before selling it to me? I assumed it was noise somewhere in my harness and sold it to another guy, he had similar issues, refunded him and now have the ecu back. Is there anything I should do besides sending it in to get checked out? Way back I spoke to a rep and they said if I can bench the ecu then it should be fine but then I emailed someone from tech recently and they said to send it in to diagnosis if its working or not then charge again for whatever needs to be fixed.

03-31-2019, 07:46 AM	#2
tuzzio Post Whore! Join Date: Oct 2013 Location: Western Mass. Posts: 2,605 Trader Rating: (3) Feedback Score: 3 reviews	When you click connect, does it show the box that says "connecting" (or whatever, its been a while..) Mine won't connect until I cycle the the key to off, and back on. I think its a safety feature.

04-01-2019, 10:43 PM	#4
Jfornachon Zilvia Junkie Join Date: Dec 2011 Location: Caldwell Idaho Posts: 300 Trader Rating: (3) Feedback Score: 3 reviews	It sounds like something is shorted int he ecu! It would be cheep insurance to make sure that you have a factory perfect ecu going in. If they find more wrong or have an update they can take care of it at that time and you can kill 2 birds with one stone. On the other hand if they guy sold you a bad ecu that's fucked and would be talking to him about it.