Document ID: chunk:federal_register_of_legislation:F2011C00805:reg:120:p22
Version: federal_register_of_legislation:F2011C00805
Segment Type: reg
Provision Reference: reg 120 (pt 22/23)
Character Range: 294613–297770

automatic-shift gearboxes, the test shall be carried out with the gear selector in either the "neutral" or the "parking" position.

         2.5.  Components for adjusting the idling speed

         2.5.1. Definition

         For the purposes of this Regulation, "components for adjusting the idling speed" means controls for changing the idling conditions of the engine which may be easily operated by a mechanic using only the tools described in paragraph 2.5.1.1. below. In particular, devices for calibrating fuel and air flows are not considered as adjustment components if their setting requires the removal of the set-stops, an operation which cannot normally be performed except by a professional mechanic.

         2.5.1.1. Tools which may be used to control components for adjusting the idling speed: screwdrivers (ordinary or cross-headed), spanners (ring, open-end or adjustable), pliers, Allen keys.

         2.5.2.  Determination of measurement points

         2.5.2.1. A measurement at the setting in accordance with the conditions fixed by the manufacturer is performed first;

         2.5.2.2. For each adjustment component with a continuous variation, a sufficient number of characteristic positions shall be determined.

         2.5.2.3. The measurement of the carbon-monoxide content of exhaust gases shall be carried out for all the possible positions of the adjustment components, but for components with a continuous variation only the positions defined in paragraph 2.5.2.2. above shall be adopted.

         2.5.2.4. The Type II test shall be considered satisfactory if one or both of the two following conditions is met:

         2.5.2.4.1. none of the values measured in accordance with paragraph 2.5.2.3. above exceeds the limit values;

         2.5.2.4.2. the maximum content obtained by continuously varying one of the adjustment components while the other components are kept stable does not exceed the limit value, this condition being met for the various combinations of adjustment components other than the one which was varied continuously.

         2.5.2.5. The possible positions of the adjustment components shall be limited:

         2.5.2.5.1. on the one hand, by the larger of the following two values: the lowest idling speed which the engine can reach; the speed recommended by the manufacturer, minus 100 revolutions per minute;

         2.5.2.5.2. on the other hand, by the smallest of the following three values:

         the highest speed the engine can attain by activation of the idling speed components;
         the speed recommended by the manufacturer, plus 250 revolutions per minute;
         the cut-in speed of automatic clutches.

         2.5.2.6. In addition, settings incompatible with correct running of the engine shall not be adopted as measurement settings. In particular, when the engine is equipped with several carburettors all the carburettors shall have the same setting.

         3.  SAMPLING OF GASES

         3.1. The sampling probe shall be inserted into the exhaust pipe to a depth of at least
         300 mm into the pipe connecting the exhaust with the sampling bag