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Home >> Honda >> 1993 >> Civic LX, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Engine Controls - System/Component Tests >> Idle Air Control (IAC) Valve
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Idle Air Control (IAC) Valve

  1. IAC valve may also be referred to as Electronic Air Control Valve (EACV). Turn ignition off. Unplug IAC valve connector. IAC is located near throttle body. See Figure or Figure . Turn ignition on. Measure voltage between Yellow/Black wire on harness connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair Yellow/Black wire between IAC valve and PGM-FI main relay.
  2. Turn ignition off. Connect test harness to vehicle wiring harness, not to ECM. See Figure . Turn ignition on. Momentarily connect terminal A9 to terminal A26 (A23 on Civic Del Sol). If IAC valve clicks, temporarily substitute known good ECM and retest system. If IAC valve does not click, repair Black/Blue wire between IAC and ECM terminal A9.
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