I have an ASR system which at times has previously been problematic. I've done a few things;most improved the problems. Replacing the upper engine wiring harness solved it for awhile. Also readjusting the throttle linkage to the correct open throttle and wide open throttle positions repaired alot of the systems ability to periodically engage. I have thought about replacing the wiring to the ETA also; that seems somewhat involved. System will sometimes engage; I reset it by restarting. Stangely enough it will usually come on before the engine has reached proper operating condition. I'm no expert just an owner tired of paying the repair :fork_off: takers. Good luck
93 400E