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Hi everyone,
I have fault code #11 in my cluster for PSD unit & abs light is also on.. today I checked the unit, there was no oil inside so I filled brake fluid in reservoir, before I could proceed as per instruction( I found instruction here in ten list), I saw that there was leak from a nut/screw behind blessed valve, any idea why it was leaking .. & leak was continuous...please check the picture for getting a better idea.
My all 3 connectors are disconnected & I do not see 12v with ignition on at pump connection, is this a problem...?
Thanks
Unless I'm not looking at your picture right, that bolt shouldn't be there. That's where the output (high pressure) line should be screwed in. Follow the green line in the picture below. Just shooting from the hip, but it looks like someone unscrewed the line and put a bolt in its place.
Here's a pic from further back, showing the high pressure line looping over and then running down and then over to the transmission and slave cylinder.
Unless I'm not looking at your picture right, that bolt shouldn't be there. That's where the output (high pressure) line should be screwed in. Follow the green line in the picture below. Just shooting from the hip, but it looks like someone unscrewed the line and put a bolt in its place.
There's a hole in the center of that "nut"....I'm betting the line is broken off.
Confirmed p....should be attached to that nut, it is cracked at the end, now I have completely removed the unit & bench tested it applied constant 12V at pump & supplied 12 v to solenoid as well for a very small period, I was cautious while doing this test as I had read that it is high pressure system...
i saw the flow coming from bleeder screw & the high pressure line( from the nut in my case).... Although it was not very fast.... I checked resistance of pump around 40ohm & solenoid 2.7 ohm....
With ignition on I could not see 12v at motor connection.....
Thanks you everybody for your time....
Confirmed p....should be attached to that nut, it is cracked at the end, now I have completely removed the unit & bench tested it applied constant 12V at pump & supplied 12 v to solenoid as well for a very small period, I was cautious while doing this test as I had read that it is high pressure system...
i saw the flow coming from bleeder screw & the high pressure line( from the nut in my case).... Although it was not very fast.... I checked resistance of pump around 40ohm & solenoid 2.7 ohm....
With ignition on I could not see 12v at motor connection.....
Thanks you everybody for your time....
If you are playing around with the PSD unit make sure you wear eye protection. That thing can throw brake fluid across the room [and further] in the blink of an eye! If it is not sealed it will not build up pressure and if the line from the unit to the diff is fractured that would be the case. I forget what the operating pressure is when working correctly but it is very high and 88 barg comes to mind.
In such condition the car must have been spinning one of the rear wheels very easily.
With ignition on I could not see 12v at motor connection.....
Not uncommon for the PSD fuse in the spare tire area to burn out; especially if the motor went into a state where it constantly ran. Have you tried replacing it?
We stock rebuilt PSD units and seal kits for the PSD slave if needed.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
If you are playing around with the PSD unit make sure you wear eye protection. That thing can throw brake fluid across the room [and further] in the blink of an eye! If it is not sealed it will not build up pressure and if the line from the unit to the diff is fractured that would be the case. I forget what the operating pressure is when working correctly but it is very high and 88 barg comes to mind.
In such condition the car must have been spinning one of the rear wheels very easily.
How it got like that is the interesting bit.
Yes I had safety gear on... I believe you are right about sealing it than only it will be pressurised ..so I will get the pipe repaired than test it on rough roads.
Not uncommon for the PSD fuse in the spare tire area to burn out; especially if the motor went into a state where it constantly ran. Have you tried replacing it?
Thankyou for the attachment... I have not checked it yet, soon will go for it
Update guys....
i have replaced pipe & now I have completed bleeding procedure as per the instructions ( found in same site rennlist)... Tried to reset fault with duramatics... But the fault is still on. ( PSD fault, differential fault on cluster )
Do you now have power at the PSD? I.e., you were able to connect power to the pump motor and build up pressure in the collector in ~20 seconds and after that you were able to trigger the solenoid and bleed fluid at the PSD and the slave cylinder? Just not sure where you're at in your diagnostics.
Have you cleaned the lateral acceleration sensor under the driver seat? If it is sending an implausible signal to the PSD control the system will be disabled. Remove the sensor, pop the plastic cover off and rinse with some electronics cleaner. Allow to dry completely and reassemble. The sensor contains a magnet. When enough ferrous debris collects on the magnet the field is able to capture the senor moving element. This will create a false signal.
01-29-2020, 02:36 PM
Porsche 928 GTS ,PSD unit leak
George Layton March 2014