Passat L4-1984cc 2.0L DOHC (1991)
Throttle Full Close Switch: Testing and Inspection
Idle and Full Throttle Switches, Checking and Adjusting
IDLE AND FULL THROTTLE SWITCHES, CHECKING AND ADJUSTING
For vehicles with separate idle and full throttle switches.
For vehicles built after 10-90 starting with control units:
49 states: 8A0 907 404
California: 893 907 404Q
The function of the idle and full throttle switches can also be checked using the VAG 1551 diagnostic Tester, see functional check later in this section
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disconnect harness connector from idle/full throttle switch connector
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connect VAG 1501 test adaptor to idle/full throttle switch connector
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wiring harness connector remains open
Idle switch (F 60), checking and adjusting
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switch Fluke 83 multimeter to resistance range
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connect multimeter to adaptor leads 1 and 2 using jumpers from VW 1594 adaptor kit
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must be 0 Ohms
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open throttle slightly
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idle switch must switch OFF and resistance must increase to infinite Ohms
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close throttle slowly and while doing so check switching point of idle switch using feeler gauge
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throttle body free play between operating lever and throttle lever
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throttle body without free play between throttle lever and idle stop (limiter screw)
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switch point "a" must occur between 0.15 mm and 0.5 mm as measured between throttle valve lever and stop screw
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adjust switch point "a" if necessary, by loosening. and moving idle switch (F 60) until specification is obtained
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re-tighten idle switch mounting screws and re-check
NOTE: To ensure proper switching of idle switch, check operating levers for freedom of movement.
Full throttle switch (F 81), checking and adjusting
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connect multimeter between adaptor test leads 2 and 3 using jumpers fromVW 1594 adaptor kit
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must be infinite Ohms
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open throttle completely
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idle switch must switch on and resistance decrease to 0 Ohms