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Hello Everyone.
I wondered why my ECO dissapears shortly after a short drive (Yellow as from beginning, then dissapear)
The ECO button do not function (no green LED)
I runned a Diagnose test and this say "Vechicle Wiring grid: Not in order"
All other fuctions is OK.
So my question:. Where shall i start to look/check the wiring for this part of system.
Sorry for the Danish language.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
A failed ECO is actually a good thing. Many people pay to have it permanently disabled. It is not good for the engine or transmission.
If you don't get any errors on the dash, I would ignore it. You can actually get it coded out so the car is unaware of the feature. Check with @BenzNinja .
Not going into ECO mode can be indicative of a larger issue.
Your car could have a possible bad/loose ground somewhere. What is interesting about your screenshot is it appears to have passed the ECO function test. Which will usually fail if there is a problem with that system. Without prior information, It’s very possible you have two separate issues.
But other things that will cause the ECO function to not engage:
Most common is a weak/old auxiliary battery. How old is your Auxiliary Battery?
Leaky fuel injectors will also cause the ECO function to not engage. ECO malfunctions are a sign of a larger issue somewhere.
Since you probably have a copy of the WIS. There is a section on the ECO circuit of your car, It will show all the ground points and their locations and some testing info. ( see below for an example) ) You’ll need to test the circuits involved for resistance to confirm. Chasing bad grounds is one of my least favorite things to do, but left unchecked it can lead to some other unintended consequences.
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