Frequency Solenoid B: Prelude

Disconnect hose number 30 from frequency solenoid valve B. Plug inlet pipe at frequency solenoid valve B. Disconnect hose number 31 from frequency solenoid valve B and connect a vacuum pump. See Fig 1 .

Fig 1: Checking Frequency Solenoid Valve A Accord model shown; Prelude model similar.
Apply vacuum to frequency solenoid valve B. If valve holds vacuum, replace frequency solenoid valve B and retest. If valve does not hold vacuum, apply 12 volts to frequency solenoid valve B.
If frequency solenoid valve B holds vacuum, valve is okay. If frequency solenoid valve B does not hold vacuum, replace and retest.