Solenoid Valves

Remove vacuum pump connector. Resistance should be 50-60 ohms between terminals No. 1 and 2, and between terminals No. 1 and 3. See Figure . Ensure solenoid valve makes operating noise when battery voltage is applied between terminals No. 1 and 2, and between terminals No. 1 and 3. If solenoid valve does not make noise, replace vacuum pump assembly.