Frequency Solenoid Valve B

1. Disconnect lower hose from valve and plug valve.
2. Disconnect center hose from valve and connect vacuum pump to valve.
3. Apply vacuum to valve. Vacuum should not be held.
4. If vacuum is held, replace frequency solenoid valve B.
5. If vacuum is not held, apply battery voltage to frequency solenoid valve and draw vacuum. Vacuum should remain steady.
6. If vacuum is not available, replace frequency solenoid valve.