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R33 GTR VSpec Attessa Bleeding Issue

Pyren
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Pyren Contributor

Pyren

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Anyone had this issue before?:

i was trying to bleed the attessa (r33 gtr vspec) and the strange issue that I have is that the bleed mode of the pump does not work. Ive done it 2 years ago and it was working. so when i disconnect the white connector under the dash the pump only starts if i turn ignition on, but when opening the bleeders it wont start on loss of pressure. if the connector is connected the pump won't do anything no matter what.

also strange is that there is only very little fluid coming through the diff bleeder, as there is no pressure. On the other hand there is good pressure on the transfercase bleeder.

I have no ECU connected, never touched any wiring on the attessa sytem and fluid level is ok.

anyone can help?

joshuaho96 Veteran

joshuaho96

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23 hours ago, Pyren said:

Anyone had this issue before?:

i was trying to bleed the attessa (r33 gtr vspec) and the strange issue that I have is that the bleed mode of the pump does not work. Ive done it 2 years ago and it was working. so when i disconnect the white connector under the dash the pump only starts if i turn ignition on, but when opening the bleeders it wont start on loss of pressure. if the connector is connected the pump won't do anything no matter what.

also strange is that there is only very little fluid coming through the diff bleeder, as there is no pressure. On the other hand there is good pressure on the transfercase bleeder.

I have no ECU connected, never touched any wiring on the attessa sytem and fluid level is ok.

anyone can help?

I'm not sure I understand. When checking the factory service manual it explicitly says you must have the ignition switch on in order to have the pump run. Have you checked for codes on the ATTESA unit? I wonder if your pressure switch is working as intended. The bleeder mode is super simple, just running the pump to reach target pressure and switching off once it does. I'm pretty sure you don't need anything from the ECU either. Lack of fluid flow in your diff might be something clogged in the system but I haven't tried bleeding a known good system yet to see how much fluid should come out.

Pyren Contributor

Pyren

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1 minute ago, joshuaho96 said:

I'm not sure I understand. When checking the factory service manual it explicitly says you must have the ignition switch on in order to have the pump run. Have you checked for codes on the ATTESA unit? I wonder if your pressure switch is working as intended. The bleeder mode is super simple, just running the pump to reach target pressure and switching off once it does. I'm pretty sure you don't need anything from the ECU either. Lack of fluid flow in your diff might be something clogged in the system but I haven't tried bleeding a known good system yet to see how much fluid should come out.

thanks for the reply!

yes IGN was on when trying it and I also know how the bleed mode should work. My problem is that the pump wont turn on if I open the bleeder. Normally I should give it 1 sec blurps to bleed but it simply does not do anything when I open any bleeder.

Where can I see codes on the attessa unit? like directly on the unit in the trunk?

clogging shouldnt be an issue as the system was not taken apart. i only diconnected the line to the back of the trans as I had the engine out for a rebuild.

joshuaho96 Veteran

joshuaho96

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1 hour ago, Pyren said:

thanks for the reply!

yes IGN was on when trying it and I also know how the bleed mode should work. My problem is that the pump wont turn on if I open the bleeder. Normally I should give it 1 sec blurps to bleed but it simply does not do anything when I open any bleeder.

Where can I see codes on the attessa unit? like directly on the unit in the trunk?

clogging shouldnt be an issue as the system was not taken apart. i only diconnected the line to the back of the trans as I had the engine out for a rebuild.

Codes should blink out on the control unit in the trunk yes. You might be able to try and ground terminal 4 on the Consult connector without the engine running to get the codes to blink out, or maybe it'll just do it regardless of whether any terminals are jumpered: https://sites.google.com/site/tyndago/gt-rattesainfrormation

I would also try and see what's going on with your pressure switch with a multimeter.

Pyren Contributor

Pyren

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5 minutes ago, joshuaho96 said:

Codes should blink out on the control unit in the trunk yes. You might be able to try and ground terminal 4 on the Consult connector without the engine running to get the codes to blink out, or maybe it'll just do it regardless of whether any terminals are jumpered: https://sites.google.com/site/tyndago/gt-rattesainfrormation

I would also try and see what's going on with your pressure switch with a multimeter.

Thank your very much!

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