found and tried it
All Honda models with programmed fuel injection (PGM-FI) have the ability to learn and adjust the engine idle speed to optimize engine idle characteristics.
The idle learn procedure should be done whenever you do any of these actions:
â€¢ Reset, replace, unplug, or reprogram the ECM/ PCM
â€¢ Disconnect or replace the battery
â€¢ Do engine work that requires R&R of the intake manifold or the throttle body
To allow the ECM/PCM adaptive idle speed system to learn and adjust the engine idle speed, hereâ€™s what you do:
â€¢ Make sure all electrical items (A/C, audio unit, defogger, lights, etc.) are turned off, then start the engine.
â€¢ Let the engine reach its normal operating temperature (the cooling fans cycle twice; the coolant temperature is about 194Â° F).
â€¢ Let the engine idle for at least 5 minutes with the throttle fully closed and with all electrical items turned off.
â€¢ If the cooling fans cycle on while doing an adaptive idle learn, add the time the cooling fans are on to the 5 minute adaptive idle learn time.
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