Idle Speed: 3.5RL

Connect scan tool to DLC or inductive tachometer to ignitor secondary loop (White taped). A tachometer signal can also be obtained from tachometer connector (remove rubber cap). See Fig 1-Fig 2 .

Fig 1: Connecting Inductive Tachometer (Typical)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Connecting Non-Inductive Tachometer (Typical)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Identifying Idle Air Control Valve (3.5RL)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Start engine and run at 3000 RPM, with no loads and transmission in Park or Neutral, until radiator fan comes on. Allow engine to idle. Disconnect Idle Air Control (IAC) valve connector. See Fig 3.If engine stalls, restart engine with throttle slightly depressed. Stabilize RPM at 1000 and slowly release accelerator until engine idles. Turn headlights on HIGH and turn rear window defogger ON. Check base idle speed with transmission in Neutral or Park, with no other loads and cooling fan off. See IDLE SPEED SPECIFICATIONS table.
If necessary, turn idle adjusting screw to correct idle. See Fig 4. Recheck ignition timing. Turn ignition off and reconnect IAC valve 2-pin connector. Remove BACK-UP (RADIO) fuse (7.5-amp) in main underhood fuse box for 10 seconds to reset ECM/PCM. Start engine and run at 3000 RPM, with no loads and transmission in Park or Neutral, until radiator fan comes on.
Allow engine to idle for five minutes with A/C, headlights and rear window defogger OFF. Check curb idle speed with transmission in Neutral or Park, with no loads and cooling fan off. See IDLE SPEED SPECIFICATIONS table. If idle speed is not as specified, go to TROUBLE SHOOTING - NO CODES article.