2. Connect the ohmmeter to the central terminal (18) on the switch and to each of the outer terminals (2 and 3) in turn (photo). The resistance between terminals 2 and 18 should be zero, and between terminals 3 and 18 infinity.
3. To adjust the switch on the L3 Jetronic system, loosen the two screws, turn the switch clockwise, then turn it slowly counterclockwise until you hear the microswitch click. Tighten the screws with the switch in this position.
Text copied from an internet website OpelBook.ru
4. To adjust the switch on the Motronic system, loosen the two screws, turn the switch clockwise, then slowly counterclockwise until you feel resistance. Tighten the screws with the switch in this position. Slowly open the throttle and check that the switch clicks as it begins to open.
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