Idle Speed Fluctuates (MIL works OK, no DTCs set)

Diagnostic procedure

Do the PCM idle learn procedure .
Check the idle speed .
Do the carbon accumulation check .
Troubleshoot the A/C signal circuit .
Check the A/C refrigerant amount .
NOTE: Turning the A/C to ON under the conditions that the A/C refrigerant amount is out of specification (excessive or too little) may cause the idle speed fluctuation.

NOTE: Also check for