Status report regarding open issues carried over from the just completed phase 1b of the development of GTR No. 15.

Report of the task for established to resolve issues regarding the testing of 2WD and 4WD vehicles on single and dual axis dynamometers (in support of EU plans for new regulatory requirements in 2016) following its first session.

Report on the efforts to resolve outstanding issues concerning the gearshifting requirements under the WLTP test cycle, including items raised during validation phases of the initial GTR procedures.

Update on EU experiences with the initial GTR No. 15 test procedures.

Table based upon document GRPE-72-10/Rev.2 reviewing errors and inconsistencies remaining in the GTR text.

Clarification of n/v ratios (engine rotational speed divided by vehicle speed) and vehicle mass definitions.

Starting note for the OBD Task Force established for the development of OBD requirement compatible with the WLTP test cycles (and potentially as a separate GTR from GTR No. 15) during the Phase 2 work on GTR No. 15.

Goals and objectives for the task force established to draft provisions for GTR No. 15 to ensure that pollutant emissions do not exceed emission limits throughout the lifetime of the vehicle.

Draft proposal for a mandate to develop two different types of tests:

a) In-service-conformity (ISC) testing to be done by the manufacturer and the authority responsible for issuing the emission type approval and intended to assess the durability of emission control systems over a certain period of use.

b) Verification testing typically to be done by an independent third party, i.e. an authority not involved in the initial type approval process, NGOs or the manufacturers’ peers, in order to check the integrity of the initial approval test itself and to ensure that the use of (partially inevitable) test flexibilities by the manufacturer is limited.

Proposal for a mandate to develop provisions under GTR No. 15 to check the level of specific pollutant emissions of vehicles corresponding to conditions encountered during the winter season.

Draft proposal for consideration of testing where the test track is too short to coast down from ~145 km/h to ~15 km/h within a single straight track, thus necessitating split runs.

Proposal to clarify procedures (calculation of dynamometer setting coefficient) and number of coast-down runs required.

Starting note for correction factors for the dynamometer roller radius, additional cooling fan, and alternative road load determination process.

1) Bag measurements vs continuous diluted sampling and 2) Calibration gases and mixtures