Status of US EPA program to validate the HILS methodology and resolve error codes.
23. The expert from the USA presented GRPE-70-15 reporting on the activities of his Country on a correlation study comparing results obtained according to Annex 9 and those obtained according to Annex 10 (in ECE/TRANS/WP.29/2014/84). He offered to share the outcome of this study with GRPE in June 2015. GRPE welcomed this offer and agreed to further exchange information on the emissions of heavy duty vehicles equipped with hybrid powertrains and their environmental performance evaluation.