|1.||Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) unti the radiator fan comes on, then let it idle.|
|2.||Connect a tachometer.|
|3.||Check the idle speed.|
|4.||Warm up and calibrate the CO meter according to the meter manufacturer¢s instructions.|
|5.||Check idle CO with the headlights, heater blower, rear window defogger, cooling fan, and air conditioner off.|
The CO meter should indicate 0.1 % maximum.