Please read everything I have troubleshooted first before making suggestions

I have the 3 acd light on and it comes on consistently after driving for a few minutes every time. I jumped pins 1-4 and read the code and got code 82 for the pump. also my abs light is not on at all.

all of this started after I pulled out my tcase to replace the inner seals that mate inside the trans because it was leaking trans fluid bad. So I pulled off the acd line and leaked out all the fluid when I pulled the t case out.

troubleshooting I have done

first tried lots of bleeding and I mean lots. Key on hold gas pedal down on and off for 5 seconds while I cracked the bleed port.

then tried jumping the relay and bleeding

Then Rebuilt my acd pump with a rebuild kit and followed the video to a T and positive I put the plate in the right direction and none of the O rings were pinched. Also the pump had little to no corrosion and I cleaned it all out. I will say the pump in the video claimed it was and Evo 9 pump but looked slightly different from mine think it was off a Canadian car
.

Example from the rebuild video and direction of plate the wider ends face towards the switch and solenoid


got a new acd pressure switch swapped that in

got a new relay swapped that in

swapped my buddys working acd module

tested all the connectors going to the pump all had voltage or continuity

tested the solenoid with a 9v battery visually saw the it click and move

got a second acd pump which I was told was bench tested built pressure and in working condition. Put in it and did the same bleed procedure key on gas pedal down. This one sounds like a jet engine compared to my old pump and my buddys known working pump. Bleed it until zero bubbles came out. Still have the 3 lights on.

I do not have the test unit for the pumps couldn’t find it in stock.

also I do not have a whine coming from the tcase but that seems to be the last thing that can be wrong. How can I check if it’s the tcase? Or it’s possible I have two bad pumps. But the pump I rebuilt sounded exactly like my buddys working pump. Compared to the so called good pump that sounded like a jet engine.

 

yeah... US cars have a different pump... JDM/EUDM are like in the video..

did you test your pump for pressure after you rebuilt it?

 

as I said I could not find anywhere I could order the pressure tester kit. But in the video he stated the jdm ones aren’t different than the us ones internally. They have a high and low pressure side the same.

 

yeah, I stated that, and internally they are the same. If you want to test it without the kit, just fill the reservoir and connect the motor directly to 12V. take care that the + is red wire on the connector. The pump will run and you should hear the motor slow down as the pressure rises. If it just runs at constant rpm, you still have the problem. Make this test and get back to this topic... then we will discuss more..

 

yes I did that test with both pumps from the car. Same thing key on gas pedal down and the pump runs constantly for 30 seconds or so then trips the 3 acd lights. I took a video of mine and my buddys doing the same test but it won’t let me post the video. His runs for a very short time then stops unlike mine.

 

if it runs constantly it is not making the pressure.. You might have any of the following problems (I had all off them at some point):

1. replacement parts you bought are bad
2. You did not clean the pump properly
3. You assembled it wrong (easy to happen as it is not just the orientation of the plate but the pump body too)
4. pump cant pull the fluid from the reservoir

My suggestion is to take the pump off the car and first test the 4. Take off the reservoir and put some oil directly into the bigger rubber pipe... run the pump and see if it takes in the oil

if it doesnt work, take the pump apart and take some pics.. I will help you further

 

so the pump that is currently in the car I bought from a trusted seller in the Evo community and he said it was bench tested it built pressure and has 70k on it. I guess it’s possible it’s another bad pump or they rebuilt it wrong but I am timid to take it apart. here’s is a video comparing it to my buddys working acd system


now the other old pump I rebuilt. I saw some of your old comments on another video saying his plate was in backwards and the groves in the housing need to follow the plate. Here’s how I built it now with the bigger end of the groove pointing down.



After this I did what you recommend and took of the reservoir and filled the bigger black hose with fluid. I used gator clips and touched the red wire to positive and other one to negative the pump made a noise for one second but did not run. Tried this on 3 different batteries.

also I saw and old comment stating the Canadian rebuild kit the plate was to thick by .25mm. I measured the thickness vs the original plate and actually the new plate was about .20mm thinner. I also saw in the comments to put all the bolts in lightly just hand tight which I did as to not pinch the plate.

 

plate thicknes makes no difference.. what is important is that it is flat... did you grind down the pump body? if the pump doesnt turn (presuming the motor is ok, does it run on its own?) then either someone ground down the body where the rotor sits, or the plate is not flat enough and it pinches the rotor when you tighten the pump...

 

remove the o ring from the pump body, put in both rotos, and then put something really flat over it.. like a straight edge or something similar... see if the rotor can be turned..

also, find a flat surface, get some 1000 - 2000 sandpaper and run the pump plate over it... see if any points on the plate stick out..

 

is that plate orientation the proper direction in my pictures?

also I did not grind of any part of the pump at all.

also what about the pump that is currently in the car? As I had said I was told it was bench tested and good. And you can hear it run in my video and it is much much louder than my buddys pump as you can tell. Does the pump in the car sound okay?

 

I'm no acd expert but I have done a lot of troubleshooting. Since you said this started after you serviced the t-case, have you looked in to what kind of troubleshooting you can do on the t-case? 3 different pumps same result..... I mean sure its possible but seems likely the problem is somewhere else. Being that the only other thing you touched was the acd... seems like things are pointing in that direction.

 

buddy's sounds great... yours doesnt..

plate orientation looks ok, but I will check.. it has been some time since I rebuilt one..

 

if it was the acd problem the OP would be loosing oil in the acd pump .... is that the case?

 

I have no idea. All I know about the acd system is very high level. When I said I do a lot of troubleshooting, I mean all kinds of random broken stuff, not ACD's specifically.

 

the ACD part in the transfer box is relatively simple. It is an aluminium piston with 2 O rings.. If the clutch pack wears down too much, or if one of the O rings fails, the ATF fluid that is coming from the ACD pump will start leaking into the transfer box.. eventually leaking out from the vent. That is the only ACD issue that I can see.

From what I have seen in the OP video, I would say that there is some sort of mechanical problem in the pump itself. He needs to take off the motor, see if the rotor turns over freely with the motor off. Check, the motor, if it turns over. I think the pump needs to get out of the car and get tested on the bench...