Connect the tester (in ohmmeter mode) to the plugs of connector 1 of switch 2 and measure the resistance, which when the switch is opened (when the throttle lever 3 comes into contact with it) should be R=∞ when the switch is closed (when the throttle lever moves away from it) it should be less than 15 ohms.
If the resistance values are not within the normal range, replace the servo motor.
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Checking the idle switch (BMW 5 Series E12)
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