Corrado L4-1781cc 1.8L SOHC SC (PG) (1990)
- disconnect throttle switch harness connector (arrow)
- connect test adaptor VAG 1501 between throttle switch harness connector and throttle switch
- switch Fluke 83 multimeter to resistance range
- connect multimeter to terminals 1 and 2 of VAG 1501 test adaptor using jumpers from VW 1594 adaptor kit
- check idle switch I for continuity
-
throttle closed=0 Ohms (continuity)
throttle open = Infinite resistance (open)
- attach protractor 3084 to throttle shaft using magnetic adaptor 3084/1
- fasten protractor pointer to throttle cable sleeve using circlip
- note protractor position via pointer
- open throttle valve approx. 10° then slowly and carefully close throttle until idle switch is activated (continuity)
-
must be 1.0 ± 0.5° before idle speed stop
If NO
- adjust switch-on point by loosening throttle switch I and moving switch until throttle switch bracket is just resting against the throttle lever
- tighten switch and re-check
Full throttle switch (F 81), checking/adjusting
Requirement
-
bypass valve adjustment OK, See: Fuel Delivery and Air Induction/Throttle Body/Testing and Inspection
- disconnect throttle switch harness connector (arrow)
- connect test adaptor VAG 1501 between throttle switch harness connector and throttle switch
- switch Fluke 83 multimeter to resistance range
- connect multimeter to terminals 2 and 3 of VAG 1501 test adaptor using jumpers from VW 1594 adaptor kit
- check full throttle switch II for continuity
-
throttle open = 0 Ohms (continuity)
throttle closed = Infinite resistance (open)