Vacuum Pump: Testing and Inspection

Inspection of Solenoid Valves (Control and Relief Valves)
1. Disconnect the connector of the vacuum pump assembly.
2. Measure the resistance values across terminals (1) and (2) and across terminals (1) and (3).

Standard value: 50 - 60 ohms

3. Check that when the battery voltage is applied across terminals (1) and (2) and across terminals (1) and (3), the operating sounds of the solenoid valves are heard.
4. If the solenoid valves are defective replace the vacuum pump assembly.

Inspection of Motor
1. Disconnect the connector of the vacuum pump assembly.
2. Check that when the battery voltage is applied across terminals (1) and (4) the motor operates.