CL600 ABC Light 1 Corner Down
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Joined: Sep 2016
Posts: 113
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From: San Diego
2002 CLK 430, 2005 CL600, 2009 Smart Fortwo
CL600 ABC Light 1 Corner Down
Hi, last night I was driving home and my ABC warning came on, not red so I kept going. When I got home and shut it off I could hear the ABC fluid exiting the left rear strut internally, not on the ground, and left rear strut lowering. What's more likely, valve block or the strut itself? Thanks
Thread Starter
Member
Joined: Sep 2016
Posts: 113
Likes: 24
From: San Diego
2002 CLK 430, 2005 CL600, 2009 Smart Fortwo
Thanks for the reply, after looking at the car in daylight I found that the back is down on both sides, I started it up and it didn't lift. I have Xentry, I'm going to check the diagnostics before proceeding. It looks like the valve blocks are easy to rebuild if necessary.
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S550 V8, CL600 V12, SLK32 AMG
From doing research, it seems the best kits are made by X8R
You are right, it doesn't seem to be too difficult to rebuild. The difficulty really is removing the valve block and then getting the valves out of the metal piece. Once the valves are out, it seems pretty straightforward to get the new o rings on.
Take pics when you do it, maybe post it here. Any issues you run into.
You are right, it doesn't seem to be too difficult to rebuild. The difficulty really is removing the valve block and then getting the valves out of the metal piece. Once the valves are out, it seems pretty straightforward to get the new o rings on.
Take pics when you do it, maybe post it here. Any issues you run into.
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Joined: Sep 2016
Posts: 113
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From: San Diego
2002 CLK 430, 2005 CL600, 2009 Smart Fortwo
I ran the Xentry diagnosis and got 2 faults, also the ABC warning was red when I started it up, only ran long enough for the scan to operate. I got 2 codes, C-1525-064 and, C1526-004. The first is low pressure, the 2nd is hydraulic fault rear left. That's where I heard the fluid moving out of the strut after I shut it off.
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Joined: May 2020
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From: Fort Worth
2005 CL55 AMG || 2005 CL65 AMG || 1989 560SEC
Probably a valve actuator or o-ring. I've rebuilt 2 front valve blocks, and had one actuator that puked some fluid out of the electrical connector, so it was obviously toast. Low pressure warning might be fixed by a fluid change, or it might go away on its own.
Replacing the o-rings is easy, just take a bunch of pics of how the wires are connected, maybe buy a random used valve block off ebay just in case you need another actuator.
You rotate the valves either 90deg or about 33deg (different for the big and small actuators) and they pull straight out of the block. Might have to get some big channel locks to get them to break free and rotate.
Maybe the accumulator on the rear popped and filled a line/the abc pump with nitrogen? I'd suspect that if the pump is showing 0 psi pressure.
Replacing the o-rings is easy, just take a bunch of pics of how the wires are connected, maybe buy a random used valve block off ebay just in case you need another actuator.
You rotate the valves either 90deg or about 33deg (different for the big and small actuators) and they pull straight out of the block. Might have to get some big channel locks to get them to break free and rotate.
Maybe the accumulator on the rear popped and filled a line/the abc pump with nitrogen? I'd suspect that if the pump is showing 0 psi pressure.
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Joined: May 2020
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From: Fort Worth
2005 CL55 AMG || 2005 CL65 AMG || 1989 560SEC
That's where I'd start, but I'd also suggest googling "abc troubleshooting pdf mercedes" and downloading the PDF that shows up in the results. Very handy for diagnosing ABC. o-rings would have more of an effect on drooping suspension after the car shuts off, which tracks with what you mentioned on the hissing. the low pressure error I'm not sure. Like I said, if an accumulator popped and pushed a bunch of compressed gas into the system, that could have gotten back to the pump and displaced all the hydraulic fluid with air, or caused some other issue. I checked the 1525-64 error and the PDF I mentioned says this, which matches what I thought: "The ABC pump may be weak, or one of the two main accumulators may be blown."
I had the hydraulic circuit fault error on a front strut, and that's the one that had the broken actuator that elaked fluid out of the electrical connector.
ABC does not take well to the american method of car maintenance, which is "wait until it breaks to fix it"- I'd replace the rear accumulator and replace o-rings on the valve block, then plan on replacing the other 3 accumulators and fixing the front valve block in the next 6 months max. I've had zero ABC issues with my CL55 over about 80k miles of driving, and I'm confident it's because I replaced the accumulators preventatively.
I had the hydraulic circuit fault error on a front strut, and that's the one that had the broken actuator that elaked fluid out of the electrical connector.
ABC does not take well to the american method of car maintenance, which is "wait until it breaks to fix it"- I'd replace the rear accumulator and replace o-rings on the valve block, then plan on replacing the other 3 accumulators and fixing the front valve block in the next 6 months max. I've had zero ABC issues with my CL55 over about 80k miles of driving, and I'm confident it's because I replaced the accumulators preventatively.
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