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Home >> Honda >> 1994 >> Prelude VTEC >> 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. Turn ignition off. Unplug IAC valve connector. IAC is located near throttle body. 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. If IAC valve clicks, 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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