Frequency Solenoid Valve A
- Disconnect wire harness from frequency solenoid valve A. Disconnect vacuum hose from solenoid. Connect vacuum pump to solenoid. See Fig 1
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- Apply vacuum to solenoid valve A. If solenoid does not hold vacuum, replace solenoid. If vacuum holds, jumper battery voltage to Green/Black wire terminal. Jumper Black wire to ground. Apply vacuum.
- If solenoid does not hold vacuum, go to step 4). If vacuum holds, replace frequency solenoid valve A.
- Disconnect jumper wires from solenoid terminals. Start engine and warm to operating temperature (cooling fan comes on). Measure voltage between Green/Black (pos.) and Black (neg.) terminals of solenoid harness at about 2500 RPM. If voltage fluctuates 0-12 volts, check vacuum hose for proper connection, cracks, blockage or disconnection.
- If voltage does not fluctuate 0-12 volts, measure voltage between ground and Green/Black wire terminal of harness at 2500 RPM. If voltage fluctuates 0-12 volts, repair open in Black wire between solenoid and ground.
- If voltage does not fluctuate 0-12 volts, repair open in Green/Black wire between solenoid valve and control unit terminal No. 29. If wire is okay, fault is in ECU control circuit. Go to TROUBLE SHOOTING
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Courtesy of AMERICAN HONDA MOTOR CO., INC.