1. Prepare the vehicle for inspection (warm up the engine to operating temperature).
2. Turn off the ignition and connect the MUT-II device to the diagnostic socket.
3. Start the engine and check the idle speed, which should correspond to the nominal value.
Engine idle speed: 710±100 min-1
4. If the idling speed is not within specification, refer to the appropriate chapter in section «F9Q1 Diesel Engine Power System».