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Civic Si

  1. Start engine and allow to idle. Disconnect vacuum hose No. 6 from dashpot diaphragm and connect vacuum gauge to hose. See Figure . If vacuum is not present, check hoses and connections. Check for blocked vacuum port at throttle body.
  2. If vacuum is present, disconnect No. 22 hose from dashpot diaphragm and connect a vacuum gauge to hose. With engine coolant temperature less than 14°F (-10°C) and fast idle speed less than 1800 RPM, check for vacuum. If vacuum is not present, go to step 5). If vacuum is present, disconnect 4-wire dashpot control solenoid connector. See Fig 1 . Measure voltage between Black/Yellow (pos.) and Blue (neg.) wire terminals. If battery voltage is present, replace solenoid.
  3. If battery voltage is not present, measure voltage between ground and Black/Yellow wire. If voltage is not present, repair open in Black/Yellow wire between 4-wire connector and fuse No. 14 or replace fuse. If battery voltage is present, turn ignition off. Connect System Checker Harness (07999-PD6000A) between ECU and ECU connector.
  4. Check for continuity of Blue wire between ECU terminal B2 and 4-wire solenoid connector. If continuity does not exist, repair as necessary. If continuity does exist, substitute a known good ECU and retest. If symptom is rectified, replace original ECU.
  5. If vacuum was not present in step 2), warm engine to operating temperature (cooling fan comes on). Check for vacuum at No. 22 hose at dashpot diaphragm. If vacuum is present, system is functioning properly. If vacuum is not present, disconnect 4-wire solenoid connector.
  6. If vacuum is still not present, replace solenoid. If vacuum is present, turn ignition off. Connect System Checker Harness (07999-PD6000A) between ECU and ECU connector. Check for continuity to ground in Blue wire between ECU terminal B2 and 4-wire solenoid connector. If continuity to ground exists, repair short to ground. If continuity to ground does not exist, substitute a known good ECU and retest. If symptom is rectified, replace original ECU.
Fig 1: Dashpot Solenoid Connector (Civic Si)
G93778Courtesy of AMERICAN HONDA MOTOR CO., INC.
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