There are three reasons why a relearn procedure must be performed.
1. Turning the key on or starting the car with the motor connector removed
2. PCM reset
3. Throttle body replacement
You will not be doing any of these three whilst removing/cleaning your throttle body.
Here is the relearn procedure just in case (really simple):
1. Reset PCM by pulling PCM fuse (underhood) for a few seconds.
2. With A/C turned off, start car and immediately put it in Drive with your foot on the brake.
3. If the car does not start initially, keep trying WITHOUT putting your foot on the accelerator.
4. Let the car idle in gear for at least 5 and no more than 7 minutes.
5. Shut off the car for 10 seconds.
6. Start engine, place in drive and let idle for 5 minutes.
7. Shut off engine.
8. Idle is learned.
