Volkswagen Golf/Jetta 2 manual

Throttle valve switch - testing
Fuel and exhaust systems - Digijet fuel injection / Throttle valve switch - testing


1 A multi-meter (set to the resistance scale) will be required to make this test.

2 Pull free the wiring connector from the throttle valve switch, connect up the meter probes between the switch contacts and check that the reading is zero ohms (see illustration). Operate the throttle to fully open it (a high СinfiniteТ resistance reading will be shown on the meter), then slowly close the throttle to the point where 0.3 mm clearance exists between the throttle lever and the stop screw. Check that zero ohms is shown on the meter.

7.2 Throttle valve switch test meter connections and securing screws
7.2 Throttle valve switch test meter connections and securing screws

3 Insert a feeler blade of 0.3 mm thickness between the lever and the stop screw to ensure the correct clearance (see illustration). If adjustment is required, loosen off the throttle valve switch screws then move the switch in the required direction to the point where the zero ohms reading is shown. Retighten the screws. Fully open the throttle valve and check that it is switched СonТ as described above.

Reconnect the wiring connector to the switch on completion of the check.

7.3 Feeler blade location for throttle valve switch check
7.3 Feeler blade location for throttle valve switch check

4 It should be noted that the throttle valve basic setting is made during production and in normal circumstances, it should not require further adjustment.

5 If minor adjustment to the valve setting is necessary, it can be made by loosening off the limiting screw to provide a minimal clearance between the screw and the stop, then tightening the screw until it just comes into contact with the stop (see illustration).

This setting is critical and to judge when the contact point is made, a piece of thin paper should be positioned between the lever and stop screw. Move the paper and simultaneously tighten the screw to the point where the paper is just clamped by the screw.

From this point, tighten the screw a further half turn.

7.5 Throttle valve basic setting showing limiting screw (A) and stop (B)
7.5 Throttle valve basic setting showing limiting screw (A) and stop (B)

6 If adjustment has been made, the idle speed and mixture should be checked, as should the throttle valve switch.


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