Having trouble bleeding ATTESA

[blind_elk]

I finally got round to purchasing the replacement solenoid for the ATTESA pump (refer my post in Vic section from April/2022).

So today I tried installing it - what a @#$% problem that is!. Gave up quickly, decided to see if simply bleeding ATTESA would help. Found a uTube video, watched, seemed simple enough. Had difficulty bleeding the rear nipple (can't swing a brake spanner up there), and had minimal fluid come out.

So, to front, disconnect clip, crack nipple, pump works for a bit, then stops. Keep cracking nipple, pump not working. (when disconnected, torque gauge goes 60% - is that right?)

So, anyone got a diagnosis? Is the whole ATTESA f*kced? Do I need to totally dismantle it and reassemble?

BTW, pic of my reservoir:

 

[joshuaho96]

22 hours ago, blind_elk said:

I finally got round to purchasing the replacement solenoid for the ATTESA pump (refer my post in Vic section from April/2022).

So today I tried installing it - what a @#$% problem that is!. Gave up quickly, decided to see if simply bleeding ATTESA would help. Found a uTube video, watched, seemed simple enough. Had difficulty bleeding the rear nipple (can't swing a brake spanner up there), and had minimal fluid come out.

So, to front, disconnect clip, crack nipple, pump works for a bit, then stops. Keep cracking nipple, pump not working. (when disconnected, torque gauge goes 60% - is that right?)

So, anyone got a diagnosis? Is the whole ATTESA f*kced? Do I need to totally dismantle it and reassemble?

BTW, pic of my reservoir:

 

The air gap in your reservoir at the bottom should not exceed 5mm. When the air bleed mode is set by unplugging the connector the pump should run to maintain a fixed target pressure. If it's not re-pressurizing after cracking the nipple for a second then something might be wrong. But if it holds pressure then it's probably fine.

[Duncan]

Yeah pump should not stop with a bleeder open when in bleeding mode, so something is not working OK. Is the error light flashing on the CU?

[blind_elk]

Well, finally got new solenoid fitted - no-one said anything about needing to drop the diff! Still getting code 18, which suggests its the pump that is rooted.

Anyone know if the pump is repairable / serviceable? Where I might find one (even to take apart to see how it works)?

[joshuaho96]

1 hour ago, blind_elk said:

Well, finally got new solenoid fitted - no-one said anything about needing to drop the diff! Still getting code 18, which suggests its the pump that is rooted.

Anyone know if the pump is repairable / serviceable? Where I might find one (even to take apart to see how it works)?

https://www.nismo.co.jp/heritage_parts/repair.html

Nismo offers an ATTESA actuator block rebuild service, but have you replaced the accumulator on the ATTESA block yet? That can cause a code 18.

[blind_elk]

So, where is the accumulator?

[GTSBoy]

It's on the same assembly as the pump. Little pressure vessel.