PCM Idle Learn Procedure: Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2025 Honda Odyssey, 2024 Honda Odyssey, 2023 Honda Odyssey, 2022 Honda Odyssey, and 2021 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

The idle learn procedure must be done so the PCM can learn the engine idle characteristics.

Do the idle learn procedure whenever you do any of these actions:

Replace the PCM.
Reset the PCM.
Update the PCM.
Replace or clean the throttle body.
When the engine or transmission is disassembled.

NOTE:

Clearing the DTCs with the HDS does not require you to do the idle learn procedure.
The PCM memorizes the learning status in its memory an hour after turning the vehicle to the OFF (LOCK) mode. If you need to disconnect the 12 volt battery terminals before memorizing the learning status in the PCM, jump the SCS line with the HDS, and wait 60 seconds, then disconnect the 12 volt battery terminals.

PCM Idle - Learn
Procedure

1. Make sure all electrical items (the A/C, the audio, the lights, etc.) are off.

2. Reset the PCM with the HDS

3. Turn the vehicle to the ON mode, and wait 2 seconds.

4. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, or until the engine coolant temperature reaches 194°F (90°C).

5. Let the engine idle for about 5 minutes with the throttle fully closed.

NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes.

6. Turn the vehicle to the OFF (LOCK) mode.

7. Jump the SCS line with the HDS.

8. Wait 60 seconds, and exit the SCS mode with the HDS.