Idle speed fluctuates (MIL works OK, no DTCs set) (Except Touring)

Diagnostic procedure

• 1.

  Do the PCM idle learn procedure .

• 2.

  Check the idle speed .

• 3.

  Do the carbon accumulation check .

• 4.

  Inspect the PCV valve .

• 5.

  Troubleshoot the A/C signal circuit .

• 6.

  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.

Also check for

• Incorrect valve adjustment
• Intake air leaks