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Post by renzo91 on Oct 5, 2022 20:35:12 GMT
Dear everybody,
Does anyone know what is the function of this setting?:
Long coding - > Activation of start-stop function: active?
Have you ever switch to Not active?
Thank you in advance for your help
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Post by newty on Oct 5, 2022 20:52:23 GMT
What to expect from telling the air condition that there is no start stop?
* Not preventing the motor to stop when in windshield defog mode (manually or automatic by sensor)
* Not starting the engine when there the compressor or electric heater is needed
.. probably more
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Post by renzo91 on Oct 6, 2022 7:42:22 GMT
Thank you for you feedback.
But, what does "deactivate" mean? If I set it, will the car always allow the start/stop functioning also when the "air conditioning" requires its deactivation or will the start-stop be always deactivated??
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Post by newty on Oct 6, 2022 8:38:54 GMT
First guess. The Air Condition will be unable to start the engine or keep it running in case it is too warm, too cold or too damp.
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Post by dv52 (Australia) on Oct 7, 2022 0:08:57 GMT
newty : good suggestion - but I expect that it's the opposite way around (albeit I'm guessing). My hunch (emphasis on "hunch") is that activating this software switch includes the Air-con operation into the Start Stop (SS) criteria that is used by the car's Energy Management System (EMS) to decide whether to turn-off the engine.
As you will be aware, there are a multitude of different conditions that must be satisfied before SS operates
The status of the Air-Con is one of these conditions in that the engine will not be switched-off if the driver chosen cabin temperature is NOT reached when the brake is pressed and the car comes to a stop. This is a separate condition to the other test about engine temperature being either too cold, or too hot (again, SS won't operate if this is the case)
So, my guess is that if this software switch is turned-off, the fact that the compressor might still be operating when the car has stopped and the actual cabin temperature test will be removed from the SS decision matrix.
Some folk mistakenly believe that disabling Activation of start-stop function: active is a way to disable SS entirely. It isn't! In fact, deactivating this software switch has the complete opposite effect; it actually causes SS to engage more often because the cabin temperature requirement is removed as a condition to switch-off the engine!
Again, I'm guessing!!
Don
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Post by newty on Oct 7, 2022 6:30:47 GMT
I now had a chance to get a closer look on it.
It is a mixup of Deactivation and Activation switches, which are not well described, some might even be non functional at all.
There are several other Start Stop related parameters which could be working, like the tolerance for cabin temperature before start stop will restart the engine to produce heat or start the compressor.
In the end: You can probably change how the AC will interact with start stop, but you will likely get the motor to stop longer and more often.
This is the case in almost all control units which are having a start/stop coding.
A lot of control units can indicate in their messages populated on the can bus that they are fine with an engine stop or they need the engine running (most even with a coded reason), they can also send a start request like the air condition, the ACC or the park assist.
Funfact: The common Golf 7 start stop deactivation hack did that exact thing. Modifying a value in the Gateway so it will never be satisfied with either the outside temperature or the bus voltage, so it will raise that specific reason to keep the engine running.
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Post by renzo91 on Oct 7, 2022 17:37:53 GMT
And what about the "start - stop" parameter, that can be supported or not supported, in the Long coding page of Multifunction Module?
I tried to switch the setting without any evident results. I didn't understand the aim of this parameter.
For sure it doesn't disable the start-stop but I am just curious about the function.
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Post by newty on Oct 7, 2022 18:34:40 GMT
4B is interesting, as this module can have plenty of functions in theory. Practically in MQBw, it is used for headlight and high beam range control and some sporty measurements in the Golf R and being described as being the low variant.
The type of FCM used in the passat for example does have adaptions for seat cushions to be adjusted (which is surely taking some energy from battery)
Some Skoda Superbs had the issue that voltage drops from the starter did cause a malfunction in the headlight range control, so maybe it is helpful for that.
So this might have no effect at all or an effect in other configurations apart from the Golf.
Please have cautions when coding 4B. Any change (maybe even resending an unchanged coding string) will void the range control and matrix settings which - even with a backup of the live data - will likely get you to a workshop for a realignment.
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Post by renzo91 on Oct 7, 2022 19:46:08 GMT
In fact, so it was. However I managed to calibrate the matrix on my own (not easy, I sweated cold for a while)
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Post by newty on Oct 8, 2022 6:04:36 GMT
You likely did not to be honest.
Just resetting the levelling does not work practically, so does resending madeup matrix calibration data.
You can copy matrix calibration from the live data, but you will need a backup.
Just sending zeros will miscalibrate them.
Since OBD11 does misinterpret the height levelling data, you cannot recreate the factory setting with it alone (plus you will need an empty fueh tank, some weights and lots of patience).
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Post by renzo91 on Oct 8, 2022 10:10:58 GMT
What about the parameter EMHLR_start_stop_function (coded/not coded) located in the Long coding menu of gateway 19?
I read conflicting opinions about it.
Have you got any information?
Moreover, what does EMHLR stay for?
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Post by newty on Oct 8, 2022 11:17:36 GMT
No Idea, but refers to the 12V Sytem and is enabled for all Cars with Start Stop, but no Mildhbyrid or Plug in Hybrid.
I would doubt that is it that easy, but thats how most of the codings have been found: Try and Error.
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vwguy
New Member
Posts: 22
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Post by vwguy on Nov 5, 2022 17:29:47 GMT
Has anyone been able to try this out to see if it prevents the engine from switching off? I believe one solution is to just unplug the sensor wire going to the battery but this can lead to sub-optimal charging from what I have read. I may do this though as start stop is driving me nuts!
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