GAR | GRPE-87-14/Rev.1

Document Number GRPE-87-14/Rev.1

1	2	3	4	6
Document title	UN R154: Proposal for additional content in GRPE/2023/12
Date	10 Jan 2023			Proposal to harmonize the requirements of the 00, 01, 02 and 03 series of amendments to UN R154 based on the following justifications: Correction of a wrong reference. In Paragraph 3. the functional requirements for the OBD system are included. Paragraph 4. describes the requirements relating to type-approval including the provisions for deficiencies. For Series 02 and 03, SAE J 1979-2 was allowed as a standard for the transmission of OBD relevant information. ISO 14229 was removed from the list of allowed standard. This proposal aligns series 00 and 01 with series 02 and 03. The standards used for transmission of OBD information are maintained by international standardisation bodies (ISO, SAE). The standardisation body maintaining the affected standard has to be informed. Alignment of wording between the first sentence of paragraph 3.2.1.2. (“ambient or engine temperatures”) and the second sentence, where “or engine” was missing to avoid misunderstanding and ambiguity. Engine temperature is sometimes used as a substitute for ambient temperature. In this case, the engine temperature is evaluated once after a longer engine shut off phase. Only in this case an approval is necessary, as this is the only case, where an OBD monitor is disabled for the complete trip. The OBD requirements for Diesel engines in Paragraph 3.3.4 of Annex C5 are limited to Level 1A. The requirements in paragraphs 6.3. (“Failure modes to be tested”) and 6.4. (“OBD system test”), are not limited to Level 1A. This proposal corrects this. Align Paragraph 6.5.1.3. with GTR No.15 to avoid ambiguity. Alignment with Series 01/03. Those allow the use of alternative preconditioning methods for Level 2. Background: Manufacturers design OBD monitoring conditions and functionalities for market specific driving conditions. Reliable monitors need enable conditions, which run the OBD monitors under circumstances, where failure detection works properly. Those enable conditions are not for all monitors represented by a three-phase WLTC, e.g. some monitors require higher load conditions. For those monitors alternative preconditioning methods are necessary.
Source(s)	OICA
Status	Formal GR review
Rulemaking area(s)	UN R154 WLTP Type Approval
Meeting(s)	GRPE \| Session 87 \| 10-13 Jan 2023 Agenda item 3. (a) UN Regulations Nos. 68, 83, 101, 103, and 154
Related documents
Related documents	GRPE/2023/12		UN R154: Proposal for a new Supplement to the 00, 01, 02 and 03 series of amendments (Formal GR review)
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Excerpts from session reports related to this document
GRPE \| Session 87 \| 10-13 Jan 2023			12. The representative from OICA introduced ECE/TRANS/WP.29/GRPE/2023/10, ECE/TRANS/WP.29/GRPE/2023/11 and ECE/TRANS/WP.29/GRPE/2023/12, which content had already been discussed in previous sessions of GRPE. GRPE agreed with the content of the proposal. 22. The representative from OICA introduced GRPE-87-14-Rev.1. The representative from Japan suggested to add the word “coolant” between the words “engine temperature” for better clarity. GRPE agreed with the content of the proposal.