560sec cruise control - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 03-22-2019, 01:04 PM Thread Starter
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560sec cruise control

Hello everyone,
As i'm sorting through some stuff on my 560, now i got to the cruise control. I read how to test and repair the amp and how to test the actuator. However, before i get to that, i was changing the valve cover gaskets and I noticed the linkage between the throttle and actuator is missing.
I have a couple of questions here:
1. Could it have been removed for a reason? Perhaps it was removed because it was making the throttle stick in an open position?

2. I read somewhere that the actuator arm should move on its own to match throttle movement even if it was disconnected. Is that true? Because mine doesn't so that probably solves half thr problem

PS: The car js an euro 1990 car with asr
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post #2 of 13 (permalink) Old 03-22-2019, 01:24 PM
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Originally Posted by CactiGuy View Post
2. I read somewhere that the actuator arm should move on its own to match throttle movement even if it was disconnected. Is that true? Because mine doesn't so that probably solves half thr problem
I suspect that means disconnected from the cruise amplifier, not from the throttle. The actuator will not follow the throttle if it's not connected to the throttle...
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post #3 of 13 (permalink) Old 03-22-2019, 10:56 PM Thread Starter
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Originally Posted by CactiGuy View Post
2. I read somewhere that the actuator arm should move on its own to match throttle movement even if it was disconnected. Is that true? Because mine doesn't so that probably solves half thr problem
I suspect that means disconnected from the cruise amplifier, not from the throttle. The actuator will not follow the throttle if it's not connected to the throttle...
Makes a lot of sense thanks! Sounds like it will not be an easy fix
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post #4 of 13 (permalink) Old 03-23-2019, 02:51 AM
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Makes a lot of sense thanks! Sounds like it will not be an easy fix
Hey CactiGuy,

In addition to John's contribution above, here are the MBCD pdfs showing the physical differences between conventional throttle linkage and the ASR variant.
*PDATE: Here are all pdfs for the Acceleration Control System - M116/4.2 L & M117/5.6 L.

As a note here, M16 the cruise actuator in manual throttle control is replaced in the ASR variants with M16/1, the actual throttle controller. Its a 'drive by wire' system.

At least you'll be able to see what it should look like & where you are..

Good luck man.

MBL
Attached Files
File Type: pdf 30-300.pdf (297.1 KB, 10 views)
File Type: pdf 30-310.pdf (33.8 KB, 5 views)
File Type: pdf 30-320.pdf (104.3 KB, 4 views)
File Type: pdf 30-330.pdf (47.0 KB, 4 views)
File Type: pdf 30-335.pdf (36.4 KB, 4 views)
File Type: pdf 30-350.pdf (1.62 MB, 5 views)
File Type: pdf 30-355.pdf (35.6 KB, 4 views)
File Type: pdf 30-360.pdf (80.4 KB, 5 views)
File Type: pdf 30-365.pdf (662.6 KB, 5 views)
File Type: pdf 30-370.pdf (305.2 KB, 6 views)
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Last edited by MBL87560SEC; 03-23-2019 at 11:53 AM. Reason: Added additional ASR Tech Info
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post #5 of 13 (permalink) Old 03-23-2019, 05:47 AM
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Hi CactiGuy,
Maybe it was disconnected for the same reason I did mine (although I unplugged the actuator, rather than disconnect the linkage): After I replaced the amplifier with a resoldered one (which didn't change anything) and installed another actuator, I could feel a vibration in the accelerator. Going back to the last thing I changed before it occurred, I unplugged the actuator and the vibration disappeared.
I am no further in figuring out why my cruise control still doesn't work, but at least I no longer have this nagging vibration under my right foot.
Tempur
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post #6 of 13 (permalink) Old 03-23-2019, 08:35 AM Thread Starter
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Quote:
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Makes a lot of sense thanks! Sounds like it will not be an easy fix
Hey CactiGuy,

In addition to John's contribution above, here is the MBCD pdf showing the physical differences between conventional throttle linkage and the ASR variant.
Here too, is the ASR Design & Function pdf.

As a note here, M16 the cruise actuator in manual throttle control is replaced in the ASR variants with M16/1, the actual throttle controller. Its a 'drive by wire' system.

At least you'll be able to see what it should look like & where you are..

Good luck man.

MBL
Hello MBL and thanks a lot for the very helpful info! It's very easy to get the wrong part
However, i am having trouble loading the photos you attached
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post #7 of 13 (permalink) Old 03-23-2019, 08:36 AM Thread Starter
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Hi CactiGuy,
Maybe it was disconnected for the same reason I did mine (although I unplugged the actuator, rather than disconnect the linkage): After I replaced the amplifier with a resoldered one (which didn't change anything) and installed another actuator, I could feel a vibration in the accelerator. Going back to the last thing I changed before it occurred, I unplugged the actuator and the vibration disappeared.
I am no further in figuring out why my cruise control still doesn't work, but at least I no longer have this nagging vibration under my right foot.
Tempur
I figured the must be a reason it was disconnected. If it ever happens to me now i know the culprit!
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post #8 of 13 (permalink) Old 03-23-2019, 08:38 AM Thread Starter
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As a side not, when i reconnect the actuator, i wouldn't feel too confident to test out the cruise control on the road. Would jacking up the read end work?
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post #9 of 13 (permalink) Old 03-23-2019, 08:59 AM
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As a side not, when i reconnect the actuator, i wouldn't feel too confident to test out the cruise control on the road. Would jacking up the read end work?
I wouldn't worry...

I think mine did the worst thing possible: when you turned the cruise on it would floorboard the throttle. When the speed exceeded the set speed by about 5km/hr, it would let the throttle completely off, which reduced the speed below the set point, so it again boarded the accelerator. Wash, rinse, repeat...

Of course, it might be a little worse with a 560 than a 350SD...

John
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post #10 of 13 (permalink) Old 03-23-2019, 10:50 AM
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Originally Posted by CactiGuy View Post
As a side not, when i reconnect the actuator, i wouldn't feel too confident to test out the cruise control on the road. Would jacking up the read end work?
I fear this would NOT work as the ASR would sense speed differences between the wheels & apply the ABS to stabilize the perceived incorrect situation.

MBL


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