When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Theres 1 wire which goes from the ECU to the ACD ECU (pin 87 on the ecu). All it is is a sense wire which senses a resistance and will fault the ECU's out if it isnt there. A plug n play will have this wire set up. Haltech, Link etc plug n plays all work fine with ACD ECU. If for some reason it doesnt with the maxx which is unlikely you can set up a small resistor circuit or connect up to a DPO with this wire so that the ECU doesnt fault.
Theres 1 wire which goes from the ECU to the ACD ECU (pin 87 on the ecu). All it is is a sense wire which senses a resistance and will fault the ECU's out if it isnt there. A plug n play will have this wire set up. Haltech, Link etc plug n plays all work fine with ACD ECU. If for some reason it doesnt with the maxx which is unlikely you can set up a small resistor circuit or connect up to a DPO with this wire so that the ECU doesnt fault.
Interesting. I was wondering what that wire was. The link g4x plugin doesn't have that pin hooked up. I haven't turned my car on yet to know if that causes a problem with the ACD.
Interesting. I was wondering what that wire was. The link g4x plugin doesn't have that pin hooked up. I haven't turned my car on yet to know if that causes a problem with the ACD.
If you turn your ignition to full on and your ACD 3 lights dont come on after 30 seconds you good. I dont think this wire is much of a worry as long as you still have the ABS ecu. its when you get rid of both that it freaks out
Interesting. I was wondering what that wire was. The link g4x plugin doesn't have that pin hooked up. I haven't turned my car on yet to know if that causes a problem with the ACD.
yes maxx same too, 87pin empty.
let me know how it works when you know
yes maxx same too, 87pin empty.
let me know how it works when you know
Just refreshed myself with the wiring diagrams and pinouts etc.
Pin 87 on the ecu goes to pin 36 on the ACD computer and is listed as idle detection. I cant find any information about what this function is for. I dont have this pin connected anymore either and mine doesnt fault but it would be good to know its function. it seems to be an on/off input so it must either tell the acd ecu its idling or not but why it needs this information im not sure.
Luckily if you dont have AYC then you dont have the birdsnest of wheelspeed sensors where they ground through the ABS ECU rather than the ACD ECU and you dont have the sense pin 49 connecting the 2 together which causes all sorts of issues
@Dallas J have you ever seen something to do with idle detection or rpm when tuning your diff ecu?
Last edited by bee-raddd; Mar 22, 2022 at 10:46 AM.
Reason: added image
Yea theres about 4 or 5 companies that do this. Motec do one. ACDPro is another. Ralliart did 2 versions although rare now as they were discontinued, (i have a tarmac version Ralliart ECU) There was at least 1 other company also doing them
Yea theres about 4 or 5 companies that do this. Motec do one. ACDPro is another. Ralliart did 2 versions although rare now as they were discontinued, (i have a tarmac version Ralliart ECU) There was at least 1 other company also doing them
truth be told, ralliart ecu was just a reprogrammed stock one..
as for other ACD controllers, there was also PECTEL and Gems.. Most of this stuff came out of GrN racing, so it never supported AYC... although, if I remember correctly, there was at least 8 different Ralliart controllers, probably doe to it being applicable on e7,8,9
truth be told, ralliart ecu was just a reprogrammed stock one..
as for other ACD controllers, there was also PECTEL and Gems.. Most of this stuff came out of GrN racing, so it never supported AYC... although, if I remember correctly, there was at least 8 different Ralliart controllers, probably doe to it being applicable on e7,8,9
Yep your correct it is a stock ecu with ralliart parameters in them i believe, they have their own part numbers etc but they look identical to the factory ones.
Gems was the other brand i was trying to find earlier i couldnt find their website anymore. I think some modern ecu companies are offering diff support also, i think Haltech Nexus may offer it now?
I would assume that the MoTeC gear is powerful enough to handle any custom ACD control scheme you could dream up, but you'd need to hire John Reed to program it for you. He lists his rate as $120/hour on his website, which is really quite cheap.
The stock ACD controller is probably flexible enough for most people's needs, though. The real benefit of the alternatives would be that you could have a clean solution that didn't require hours of trolling through old forum threads and dealing with ancient tuning software to adjust.
