Curb Idle Speed Check

Required Special Tool: 

MB991502: Scan Tool (MUT-II)

1. Before inspection's set vehicles to the following conditions:
   • Engine coolant temperature: 80 - 95°C (176 - 203°F)
   • Lights and all accessories: OFF
   • Transaxle: Neutral (P range on vehicles with A/T)
   CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
2. Connect scan tool MB991502 to the data link connector.
   Fig 1: Connecting Scan Tool To Data Link Connector - Checking Curb Idle Speed

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. Confirm basic ignition timing is within the standard value. (Refer to IGNITION TIMING CHECK  .)
   1. Standard value: 5° BTDC +/- 3° 
4. Start the engine.
5. Run the engine at idle for 2 minutes.
6. Check the idle speed. Select MFI service data item number 22 and take a reading of the idle speed.
   1. Curb idle speed: 700 +/- 100 r/min 
   NOTE: The idle speed is controlled automatically by the idle air control system.
7. If the idle speed is outside the standard value, refer to SELF-DIAGNOSTICS - EXCEPT 2.0L TURBO or SELF-DIAGNOSTICS - 2.0L TURBO articles. .