So hears what guy i got an evo 7 and my problem is that the three lights on the dash remain on at all times... i scanned the car and its says pump fail... but i am guessing that the pump works because my mechanic said that it is working... never the less another problem is that i am hearing an annoying humming noise coming from the rear of the vehicle an it is sounding like the diff is making noise... i spoke to my tuner and he told me that i should invest in the evo rs diff that does not work with the AYC pump... i am from the Caribbean and its very hard to get my hands on an rs diff so can you guys advise me on what i can do?

 

http://www.lancerregister.com/showthread.php?t=196813

Read this , hope it helps

 

there can be faulty sensors on the pump, check them first. Its under the rear bumper...