ABC - pressure too low CL 600 year 2001
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ABC - pressure too low CL 600 year 2001
I have an issue with ABC;
Can it be that there is an internal leak inside the operating valve block - and one of the solenoids is not operating properly? How can I confirm that solenoids are OK using that diagnostic tool?
MB diagnostic software shows the fault code "low supply of hydraulic pressure". And the grey warnings of ABC workshop visit come to the instrument panel - after running the motor 15 mins - not even driving.
The pressure test gives at the beginning some 170 bar, but gradually comes down to some 120 bar in 15 mins.
I have changed all the O-rings in solenoinds in valve blocks and the car stands even months without any issues on any level it was left. No leak in blocking solenoids.
Can it be that there is an internal leak inside the operating valve block - and one of the solenoids is not operating properly? How can I confirm that solenoids are OK using that diagnostic tool?
MB diagnostic software shows the fault code "low supply of hydraulic pressure". And the grey warnings of ABC workshop visit come to the instrument panel - after running the motor 15 mins - not even driving.
The pressure test gives at the beginning some 170 bar, but gradually comes down to some 120 bar in 15 mins.
I have changed all the O-rings in solenoinds in valve blocks and the car stands even months without any issues on any level it was left. No leak in blocking solenoids.
Member
Joined: May 2011
Posts: 235
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From: Southern California
97 Lexus LS400, 04 Mustang, 08 Corvette Z51, 92 Honda Civic Si, 02 CL500, 03 E500
Since your car doesn't sag at any corners as you've stated then I would say your valve blocks are fine. You must have a weak pump so concentrate there.
Senior Member
Joined: Apr 2019
Posts: 428
Likes: 96
From: Houston
001 s600, 94 sl600
After many years of working on Nissan Active Suspension systems and decades of MBZ hydro-pneumatic systems, I offer the following:
(1) The pump is sucking air somewhere in the hose/connections/filter
(2) One of the pressure control elements 'O' rings is not holding once it heats up and it leaks internally.
(3) The pump has an internal fault --- one of the leaf valves has failed allowing internal leakage when it heats up.
(1) The pump is sucking air somewhere in the hose/connections/filter
(2) One of the pressure control elements 'O' rings is not holding once it heats up and it leaks internally.
(3) The pump has an internal fault --- one of the leaf valves has failed allowing internal leakage when it heats up.
