hello

alan here from Durham in england ,did you finaly solve your icv voltage problem ?

i have a 1991 r129 500sl with similar issues ,the icv functions on applying 12v on the bench and intermittently activates of its own accord ?

tested as forums suggest at pin 3 on the inner wing diagnostic port for the injection system (k e jetronic mechanical) they advise should be approx 6 volts
but only showing 0.8 volts ,have checked and double checked ovp relay and continuity from engine connector that sits next to ecu down to idle cont valve -all ok.
just getting weird readings at 2 conectors on icv .VERY wierd thing also is if
put my home made blink tester on the car and put 3rd wire into pin 3 on the 16pin diagnostic plug it clicks the icv into action ????

if anyone has similar experiences please help as spent hours and hours on this fault

cheers for any advice given