JaySee56

This is pretty long, but...
I had a slightly leaking front strut so, trying to stay ahead of the game, I had both front struts, front accumulator and pulsation damper changed by my Indy. A rodeo was done, but he does not have a Star Diagnostic kit. Since then, I get white “ABC- visit workshop” warnings whenever there is a large dip in the road (speed bumps etc.) Took it into the dealer for Star Diagnosis. Their first recommendation was to change the trunk battery (!!) Told them to have another look, and they came saying they found code “C1526-008 fault in hydraulic circuit at right rear suspension strut” so I needed the right rear strut changed. ($2800 plus labour). That didn’t jive with the work done on the front, so at that point I decided it was time to invest in a Star Diagnosis set myself. The car will go through both a rodeo and pitch cycling with no faults, minimum pressure during the rodeo is 145bar with 200 bar static. I have found that there is occasionally both faults C1526-002 and -008 fault in rear hydraulic circuit, right and left sides. When the ABC system locks up after a fault, the rear is typically at least 1 inch higher than normal. When the code is cleared it immediately returns to normal height. This made me suspect the return pressure reservoir, so I changed both the reservoir and the rear pressure accumulator. This did no good, even after several rodeos. I am now suspecting the rear valve block (cleaned and ‘O’ rings replaced last year, system flushed and filter replaced with 3 micron) or a pinched return line somewhere where the work was done up front. Any other ideas?

dgschroeder

get rid of the abc system its a geat money pit on an almost 13yr old car...

JaySee56

I'm guessing the top block is the manifold for the front and rear return lines. The exhaust line to the cooler was switched with the return line from the rear valve block. So far, so good.

Rudeney

Good catch! I am surprised there was enough slack to cross those lines.

Welwynnick

That's shocking. See what happens when you let professionals work on cars.


Nick

Rudeney

Yeah, like my local MBZ dealer who destroyed my flywheel and transmission fluid pump on the CLK when they pulled the engine to repair the timing chain idler sprocket. I think all mechanics will make mistakes. The difference is, when I do my own work and screw it up, I take full blame. Most shops make excuses and then charge more to fix theirs.

JaySee56

Yeah, but.. sure is nice having a fully functional sl55 again. Even without the ABC, she still rode better than a CTS.
"When she was good she was very, very good, but when she was bad she was horrid...."
Just have to get over the horrid bits.

Greyhound1

I know this is an old post but, I was reading your comment and I’m getting the same code 1526-008 and 1525-004 and I’ve replaced all of my accumulators and rebuilt my valve blocks but, I can’t understand your comment on how you fixed it. Can you please clarify

JaySee56

Take a look at the photos on post #3 above. The first is from WIS. The second is as found, The hoses feeding the top block are switched, the line coming from the bottom feeds the port on the right and vice versa. The third is the fixed photo with the lines routed as per the photo from WIS.
Is this Jay John?

Greyhound1

Ok, that’s the front valve block…..my problem is at the rear.

Greyhound1

I took a look at the hoses on my front valve block and compared them to your photos and I was hoping that I may have crossed them but, they are correct…now I’m wondering what could be my problem.

JaySee56

The codes are saying there is a problem in the hydraulics in the back of the car. (Yeah, thanks...) I was originally looking for a pinched line somewhere, but any kind of restriction or flow interruption would do it. A careful trace of the lines that you've worked on while referring to WIS might be in order. Good luck!

Greyhound1

When I rebuilt my valve blocks, the only thing I never touched was that small top block on the front where your hoses was switched. You think that might be restricted?

JaySee56

No. If there were no problems before you touched it, it was probably something you touched. ;-)

Greyhound1

Actually, no…. I was getting those ABC malfunctions before I touched it!