Vacuum Pump Test
- 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 -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. Remove vacuum pump connector. Apply battery voltage between terminals No. 1 and 4. Motor should operate. Replace motor if it does not operate.