Idle Relearn
WARNING: This page is about a different car, the 2003 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
When battery is disconnected and reconnected, the idle learn procedure must be done, so the Electronic Control Module (ECM) and Powertrain Control Module (PCM) can learn engine idle characteristics. Ensure all electrical items (A/C, audio, rear defogger, lights, etc.) are off. Start engine and hold it at 3000 RPM with no load (in Park or Neutral) until the radiator fan comes on, or until engine temperature reaches 194°F (90°C). Let engine idle for about 5 minutes, with the throttle completely closed (if radiator fan comes on, DO NOT include its running time in the 5 minutes).