1. Before checking the idle speed, check the following item:
(1) Check the air cleaner element is free from clogging, ignition timing is correct, spark plugs are in good condition, and hoses are connected properly.
(2) Check the malfunction indicator light does not illuminate.
2. Warm up the engine.
3. Read the engine idle speed using Subaru Select Monitor. 
NOTE:
• Idle speed cannot be adjusted manually, because the idle speed is automatically adjusted.
• If idle speed is out of standard, refer to the General On-board Diagnosis Table under “Engine Control System”.
(1) Check the idle speed when no-loaded. (Headlight, heater fan, rear defroster, radiator fan, A/C and etc. are OFF)
Idling speed (At no load; Select lever is in “P” or “N” range on AT model; Gear shift lever is in neutral position on MT model.):
Standard
650±50 rpm
(2) Turn the A/C switch to “ON” and operate the compressor for at least one minute to check the idle speed when loaded. (model with A/C)
Idling speed (With A/C ON; Select lever is in “P” or “N” range on AT model; Gear shift lever is in neutral position on MT model.):
Standard
775±50 rpm (When the compressor load is low) 850±50 rpm (When the compressor load is high)