Vanagon F4-1915cc 1.9L (Water Cooled) (1983)
Throttle Full Close Switch: Testing and Inspection
Late Version With Single Combined Switch
Throttle Valve Switch, Checking/Adjusting
Checking And Adjusting The Throttle Valve Switch
Combined switch in single housing
Check switch continuity as follows
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Connect multimeter US 1119 across terminals of unplugged switch connector 1
Multimeter must read 0 ohms only when throttle lever is at idle stop and full throttle stop
Check switch-on point of throttle switch as follows
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Open throttle valve and slowly close
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Measure switch-on point with feeler gauge between idle stop and idle adjusting screw
Must be 0.05-0.10 mm (0.002-0.004 in) before idle stop (gap a)
If measurement NOT OK
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Correct by adjusting position of switch.
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Loosen screw 2 and adjust screw 3
CAUTION: Basic throttle valve adjustment must NOT be changed.
Note: Correct adjustment is important. Following are conditions that are created by improper adjustment:
Gap a too large:
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Engine surges with lean condition.
Gap a too small:
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With cold engine, stalling at full throttle acceleration.
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With engine warm, no deceleration fuel shut-off.
Control Unit and Wiring, Checking
Checking Control Unit And Wiring