In an effort to make my car a bit more durable, I decided to move the ACD pump assembly from the stock location to the space behind the seats (i.e. somewhere that the rocks can't get it at a rally).

I've bled the ACD before, both with the stock ACD computer, and also with the MoTeC MDC unit, and both times, I've used the "ignition on, full throttle" and after a few seconds, the unit will pump for 5 seconds. We used this method to drain the reservior prior to removing it from the car. It only took one 5 second stint to just about empty the reservior.

I re-routed the wires and had a new hydraulic line fabbed up. Once everything was double checked, I went to bleed the system. When I turn the car on, the ACD pump primes itself, bringing pressure to ~1600kPa. Then, after some time, when the pressure drops, it will re-prime the system back to 1600kPa. Unfortunately, I never looked to see what kPa readings it gave me before with the MoTeC, and I didn't have the stock unit handy. According to the factory manual, 1600kPa is the top of the range for factory pressure. Holding the throttle down does not seem to work to get the pump to bleed.

Since the system is programmed to max at ~1600kPa, I think the safety mode or shutoff valve is working. When the bleeder valve is opened, I'm not getting huge amounts of fluid coming out. We're seeing bubbles and fluid dripping out, but the system is not losing much pressure when the bleeder is open.

Any thoughts, tips, tricks? What am I missing?

Thanks,

Dave

 

Pics?

 

Using the gas pedal is the incorrect procedure. The correct procedure for bleeding the ACD is somewhat more in depth. Here is what i have been given by an experienced mitsu tech:


Select the "Air Bleed ACD" actuator
crack the bleeder, have the steering wheel at 0 degrees with the ebrake off, then turn the steering wheel past 15 degrees or so and the pump will run for a few seconds, then turn the steering wheel 15 degrees the other way and repeat. When no more air is present, close the bleeder and fill the reservoir higher than the MAX line.

Select the "Oil Level" Actuator.
The oil level should suck down, afterwards fill the reservoir to the MAX level.


Select the "Motor Drive" Actuator
This should lower the oil level to just about the MIN line.
Procedure is complete. (Do NOT refill the reservoir back up to the MAX line.)


The only way I have done this correctly is with the MUTT-III, however while I was playing around with evoscan once, I did see the actuator tests listed, I have not tried using them yet though.

 

I've always used the 'internet' procedure before and have never had any issues. Just this time, it won't seem to do anything on the pump. The primary difference, is before I was just bleeding to get rid of a little air, this time the pump sat out of the car for a few days with all the fluid drained out.

Any chance you'd know what kPa levels the pump uses when going thru with the Mitsu scan tool?

I brought my stock ACD computer with me today, so this afternoon, I'll swap it back in instead of the MoTeC unit. I'm thinking maybe I mistakenly loaded some different program into it...or that having the diagnostic cable hooked up might not allow for the bleed procedure. Either way, I'm stumped since the pump seems to be doing the right things except for the bleed procedure.

Also, if anyone's used the MoTeC box, have you ever used the bleed procedure outlined in the instruction manual? I couldn't get that to work.

Thanks,

Dave

 

dave,

turn the car off...
press the acd mode button and hold it while turning on the ignition...
after five seconds, all of the acd lights will start to flash...
you are now in bleed mode...
depress the throttle to run the pump...
be careful as there is no time limit for the pump to run...
when you are done, cycle the ignition and everything will be normal.

-franz

if you have trouble getting this to work, just give me a call.

 

Thanks so much! In the manual it didn't say when to begin pressing the ACD switch, so I was waiting till the ignition was on. Hopefully this will get me going.

Also, I was curious if you know how to get any fault codes out of the ACD unit? I don't have a MoTeC ECU on the car, just the MDC. Its showing 1 in the fault code.

One last thing...I couldn't find one way or the other in the manual. But, when you're driving with around, is the ACD indicator light always supposed to flash, or should the light be solid? Mine will run thru the 6 modes, but the lights always flash.

Thanks,

Dave

 

is this for the MOtec or does it work for the stock ACD ecu?

 

I beleive its just a MoTeC thing...they just didn't describe it too well in their manual...or I was too frustrated to read it clearly.

Dave

 

Connect to mdc and go online to see erro.

Flashing lights indicate error that needs to be sorted

 

I connected up to the MDC last night, but I'm not able to find anywhere in the window to download error data. I can look at all the parameters when I go "Online" ---> "Monitor Channels" (wheel speeds, pump pressure, voltage, etc), and that's the screen where the system is showing one error. I just don't see anywhere in the menu where I can do anything with error checking.

I see in the manual it lists out all the different fault codes...but I'm unsure how I'd go about getting those from the MDC.

Thanks!

Dave

 

Made some progress in figuring out the problem. We pulled the lines off the car to see if there were any issues with the newly brazed lines...thought a blockage might've been causing the issues. No problems there. Next up, wiring. We checked for continuity between the plugs at the pump and the plugs at the ACD. No problems there.

Then it was time to check to see if I got the wires in the right places. I de-pinned and re-pinned one at a time when I did the swap, but the pin that goes to the pressure regulator got put in pin 14 instead of pin 1. Ooops! So, it apears to be all good to go now, but it was late and I didn't feel like buttoning everything up, so I'll wrap up the project this afternoon.

The MoTeC is still seeing one error, but when I plug the factory ACD box into the car, all is well.

Thanks to all who offered help!

Dave