I have the ASD warning light on my w124 1991 300CE 24v. Can some kind person please email me the relevant pages from the service manual or a system and electrical schematic for this please.
Are there any service requirements? I know there is an accumulator somewhere, does this need filling or does it get fluid from the brake system? Also does this system need bleeding if empty. Finally if the fault is fixed will the light go out or does it have to be reset with a diagnostic computer This car has the old pulse system

As posted before diagnosis starts with reading the codes in the ASD computer. With that info in hand then you can decide if there is an electrical of mechanical fault.