Volkswagen Golf/Jetta 2 manual

Diaphragm pressure switch - testing
Fuel and exhaust systems - K-Jetronic fuel injection - 16 valve engines / Diaphragm pressure switch - testing

Pull the wiring connector from the switch, then connect an ohmmeter to the switch terminals (see illustration).

5.1 Checking diaphragm pressure switch
5.1 Checking diaphragm pressure switch

With the engine idling, the reading should be infinity. Quickly open and close the throttle and check that the resistance drops briefly then rises to infinity.

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