Looking for advise from ABC Expert

I have my car connected to Star and it indicated pump pressure is 187 bar. Is that normal or on the low side? How many bar should a new pump put out? My car has 135K miles and I do not know if the pump has been changed or not.

when he try to do Rodeo, the pressure go down to 120 bar and holding there. Should the pump holding 200 bar of pressure during the entire Rodeo process ?

 

Mine is around 190 bar not exactly 200. I think 187 bar is normal.

When rodeo it droped from 190 to 140 gradually.
If it functions normal it is fine. The pump is not a high volume one so it won't hold the highest pressure gained before rodeo. Sometime the rodeo will stop in the middle waiting for the pressure to be built up and it is normal. It's totally controled by the system.

BTW, my car is 2003 with 80k miles and I believe yours is fine.

Thanks.

Howard

 

during the Rodeo the pressure did drop fast and I was hoping it will continue but after holding around 120 bar for a little then Star system stop Rodeo and has a fault : Failure in pressure supply system .
Indy suggest new pump but I am confuse if the pump is bad then how it could supply 187 bar of pressure earlier.
He try again and it come back with the same fault again.

 

I thought you mentioned it held in 120 bar in your first post.
Now I understand it couldn't pass the rodeo. But I believe rodeo is tougher than regular driving.

Why do you need a rodeo ? Do you have any ABC issue during driving ? Beside rodeo error do you have any other msg related to ABC ?

If I were you I'll leave it there if driving was normal.
If I were the mechanic I'll replace the pump since there is error during rodeo.

Thanks.

Howard

 

I did have abc message visit work shop come up and go in last 2 months so that why I bring it in to check. Star system pull up code C1531-8 rear strut move even valve closed. I can see the rear passenger very very slowly raise by itself when park. Indy suggested change the fluid and Rodeo first to see if it go away. Since it drop the pressure from 187 bar all the way down to 120 I am very interested to find out what other owner has when they Rodeo their car . Howard, did your car ever drop below 140 bar during the Rodeo? Indy also show oil mark on the pump, he want to change the pump first, now I will need to find out where to buy a new pump at good price.

 

Mine didn't drop below 140 bar.

You initial msg pointed to the Check Valve in the rear Valve Block. It should tell you which side as well. That means the Check Valve for that strut didn't close properly hence the strut still move. BTW, the Check Valve is used for hold strut current position.

Base on this msg, if I were you I will do:
1, Replace old ABC filter which is 10 micron with new filter which is 3 micron;
2, Siphon and fill with new ABC Hydraulic fluid; if you can flush that's even better;
3, Rodeo again or just hit ABC button many times by your own;
4, Above process is regular ABC maintenance which help maintaining ABC healthy. Even you don't have ABC issue it need to be done every 60k miles. For your case it may help clean dirt accumulated after years;
5, Drive to see whether the issue comes back;
6, If still has the same issue you need clean the Valve Body like I did here:https://mbworld.org/forums/5184137-post81.html
But if you can't do it by your own, I guess the mechanic won't either, then you need to replace the Rear Valve Body.
Normally the mechanic will suggest replace major components one by one start from the pump. But in your case I believe the Rear Valve Body is the first.

If the Check Valve is leaking, replace pump seems won't cure your issue.

Base on my guess, here is the explanation for your rodeo issue: if the Check Valve in the Rear Valve Body has problem, the Regulate Valve may also not functioned properly. BTW, the Regulate Valve control the pressure and return flow. This issue led to fluid returned/leaked too much to reservior. When the pump couldn't feed the system as fast as the Regulate Valve leaked then the system won't hold enough pressure.

Visual check all the components and hydraulic lines provide more info too. But I doubt you are losing much fluid and cause your current issue.

Thanks.

Howard

 

When I RODEO'd my car last month, it started the 12-14 minute procedure at 187 bar. It fluctuated up and down the entire time, but net effect was a decrease in pressure that was dipping to 114 at the very end (with no errors or pauses). I'd say it averaged in the range of 130-140 for the majority of the time. Even at the end in the 114-120 range, the car was dancing around no slower than earlier in the process at higher pressure levels.