CHAP.7 – USE OF THE INSTRUMENT 38/ 38 ENGLISH
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7.1.2.5 GAS READING
Before beginning the test, make sure that the probe has been correctly inserted into the
exhaust pipe of the vehicle and that it has not encountered any impediments or
obstructions
The test will now proceed in different ways, depending on the type of vehicle:
* Only at idling rate if the vehicle does not have a catalytic silencer.
* At idling rate and at accelerated idling rate for vehicles with catalytic silencer.
"Idling rate" means the rate at which the engine operates (never more than 1000 rpm)
with the accelerator and enrichment jet controls in the hold position, all electrical users
disconnected, the gearshift in the neutral position and the clutch disengaged.
"Accelerated idling rate" means a 2000 to 2500 rpm engine rate with the accelerator
and enrichment jet controls in the hold position, all the electrical users disconnected, the
gearshift in the neutral position and the clutch disengaged.
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