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.
How do you get aftermarket engine ECU and AYC to work - Evo 4 1997
Hello!
I have some trouble getting the AYC pump to turn on as it should. I have changed to a aftermarket ECU called MaxxECU Sport with flying lead so no plug in play.
I have looked up what signals the AYC ECU got from the engine ECU and seems like it was only TPS signal. I got a TPS signal wire from the TPS to the AYC TPS input and I get a 0v to 5v singal from the TPS and it changes when i move the gas pedal but no pump starting when I try to test the pump with the pedal down 3 sec test or while driving.
The AYC worked fine before the engine ECU change and have now checked that everything else is in order from relays to all grounds needed and signals and that the actual pump worked. Checked that all ABS sensors as well because the AYC uses the wheel speed sensors as well and it seems that eveything is in order their as well.
I use a bosch TPS for this ECU with 3 wires, 5v, sensor earth and signal instead of 4 as the OEM one has.
Has anyone had the same problem when changing to a aftermarket ECU or those anyone have any advice or thoughts on this?
Apr 25, 2024, 01:03 PM
