23/04/2019
Rev 3
29
II.5.3.Preliminary checks
Before undertaking any measurement, the operator must verify that the engine is operating
correctly.
The following points are to be observed:
The vehicle exhaust line must be gas-tight.
The gearbox must be in neutral, with the clutch engaged, for vehicles with manual or semi-
automatic transmissions; the selector should be in neutral for vehicles with automatic
transmissions or in accordance with the instructions of the vehicle manufacturer.
Accessories and optional equipment that influence the engine speed at idle must not be
activated, barring manufacturer’s instructions or regulation to the contrary.
The engine must be at normal operating temperature that is to say with an oil temperature at
least equal to 80°C.
