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Resonator Control

  1. Start engine and allow to idle. Remove vacuum hose to resonator control diaphragm. Connect vacuum gauge. If vacuum is not present, go to step 3). If vacuum is present, increase engine speed to about 3000 RPM. If vacuum is still present, go to step 7). If vacuum does not exist, connect vacuum pump/gauge to resonator diaphragm. See Fig 1 .
  2. Apply vacuum. If diaphragm linkage activates and vacuum holds, no problem exists in resonator system. If linkage does not move and/or diaphragm does not hold vacuum, replace diaphragm or repair binding linkage.
  3. If vacuum was not present in step 1), disconnect lower vacuum supply hose at resonator solenoid. Check for vacuum. If vacuum is not present, check for blockage in hose or vacuum port, or disconnected hose.
  4. If vacuum is present, disconnect 6-wire connector from resonator control solenoid. See Fig 2 . Measure voltage between Black/Yellow (pos.) and Red (neg.) terminals. If battery voltage is present, replace resonator control solenoid.
  5. If battery voltage is not present, measure voltage between ground and Black/Yellow wire. If battery voltage is not present, repair open in Black/Yellow wire between 6-wire connector and fuse No. 4 or replace fuse.
  6. If battery voltage is present, turn ignition off. Connect ECU test harness connector between ECU and ECU connector. Check continuity of Red wire between ECU terminal A10 and 6-wire resonator solenoid connector. If continuity does not exist, repair Red wire as necessary. If continuity does exist, substitute a known good ECU and retest. If condition is rectified, replace original ECU.
  7. If vacuum was present in step 1), with engine speed at 3000 RPM, disconnect 6-wire resonator solenoid connector. See Fig 2 . If vacuum is now present, replace solenoid. If vacuum is not present, turn ignition off. Disconnect connector "A" from ECU. Check continuity to ground on Red wire to ECU terminal A10. If continuity exists, repair short to ground between ECU terminal A10 and 6-wire solenoid connector.
  8. If continuity to ground does not exist in Red wire, substitute a known good ECU and retest. If condition is rectified, replace original ECU.
    Fig 1: Resonator Control System
    G93639Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Resonator Control Solenoid Connector
    G93640Courtesy of AMERICAN HONDA MOTOR CO., INC.
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