OM602 ELR not working at all

[alghamedGT]

Hi folks
Recently after repairing the ovp relay i found that my car has an ELR Relay and thats make sense because my car was auto (now 5spd Manual) and has AC but i dont think that ELR is working anymore
any hope to bring my ELR to life ?
because in cold morning or when using ac in neutral my engine shakes horribly
and from my research the ELR increases engine speed in when ac on and when engine is cold
because of the lack of informations for this ELR i have no ideas of things i need to do or any diagnostic steps
any Ideas ??

my car is a 1991 w201 NA OM602