Passat L4-1984cc 2.0L DOHC (1991)
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switch point "a"=0.15 mm to 0.5 mm before idle stop
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measure resistance between adaptor leads 2 and 3
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must be infinite Ohms
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open throttle completely
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full throttle switch must switch on and resistance decrease 0 Ohms
Idle and full throttle switches, adjusting
NOTE: The switching point of the idle switch is the only adjustment possible. The full throttle switch and potentiometer become adjusted as a result
of adjusting the idle switch and are not adjusted separately.
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remove throttle body
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remove heat shield
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loosen potentiometer 1 (arrows)
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rotate and hold potentiometer first clockwise and then fully counterclockwise (carefully) up to stop
CAUTION: Turn potentiometer using very light force otherwise the throttle will open.
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tighten potentiometer in this position and check switching point as described in section "Air Flow Sensor Potentiometer, Checking and Adjusting".
See: Air Flow Meter/Sensor/Testing and Inspection
Idle and full throttle switches, functional testing
For vehicles built after 10-90 starting with control unit:
49 states: A0 907 404
California: 893 907 404Q
Requirements
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A/C switched OFF
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selector lever in "P or N setting" (vehicles with automatic transmission)