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Intake Control Solenoid Valve (Accord & Prelude)

  1. Start and idle engine. Remove upper vacuum hose from intake control solenoid valve, located at top of engine, on left side. Connect vacuum gauge to solenoid valve. If vacuum does not exist, go to step 2). If vacuum exists, increase engine speed to 3700 RPM (4200 RPM for Prelude). If vacuum still exists, go to step 4). If vacuum no longer exists, solenoid valve is okay.
  2. Disconnect lower vacuum hose of solenoid valve from air chamber. Connect vacuum gauge. If vacuum exists, go to next step. If vacuum does not exist, inspect vacuum line for improper connection, cracks and blockage in hose. If vacuum line is okay, clean manifold port.
  3. Unplug connector from intake control solenoid valve. Measure voltage between Black/Yellow and White wire terminals. If battery voltage does not exist, solenoid valve is okay. If battery voltage exists, replace intake control solenoid valve.
  4. If vacuum existed in step 2), unplug connector from solenoid valve. If vacuum no longer exists, solenoid valve is okay. If vacuum still exists, replace solenoid valve.
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