Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:99:p29
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 99 (pt 29/39)
Character Range: 1235077–1238048

service mode becomes active and the vehicle speed is limited to 20 km/h after the next time the vehicle is stationary or after 30 minutes operating time without standstill (see paragraph 4.2.2.1 of this annex).

              The vehicle operates again in dual-fuel mode as soon as the failure is repaired.

              A.2.2.3. Abnormality of the gas consumption

              Figure A2.4 gives via one typical use-case an illustration of the events occurring in the case of an abnormality of the gas consumption.

       Figure A2.4
       Illustration of the events occurring in case of abnormality of gas consumption (Types A and B HDDF)
              In that use case the service mode is activated (in the case of a Type A HDDF)  or the engine switches to Diesel mode (in the case of a Type B HDDF) as soon as the DTC gets the "potential" status (1st detection).

              In the case of a Type A HDDF, the service mode becomes active and the vehicle speed is limited to 20 km/h after the next time the vehicle is stationary or after 30 minutes operating time without standstill (see paragraph 4.2.2.1. of this annex).

              The vehicle operates again in dual-fuel mode as soon as the abnormality is rectified.

                   Annex 15 - Appendix 3 HDDF dual-fuel indicator, warning system, operability restriction - Demonstration requirements
              A.3.1.  Dual-fuel indicators

       A.3.1.1. Dual-fuel mode indicator

              In the case where a dual-fuel engine is type approved as a separate technical unit, the ability of the engine system to command the activation of the dual-fuel mode indicator when operating in dual-fuel mode shall be demonstrated at type-approval.

              In the case where a dual-fuel vehicle is type approved as regards to its emissions, the activation of the dual-fuel mode indicator when operating in dual-fuel mode shall be demonstrated at type-approval.

              Note: Installation requirements related to the dual-fuel mode indicator of an approved dual-fuel engine are specified in paragraph 6.2. of this annex.

       A.3.1.2. Diesel mode indicator

              In the case where a dual-fuel engine of Type 1B, Type 2B, or Type 3B is type approved as a separate technical unit, the ability of the engine system to command the activation of the diesel mode indicator when operating in diesel mode shall be demonstrated at type-approval.

              In the case where a dual-fuel vehicle of Type 1B, Type 2B, or Type 3B is type approved as regards to its emissions, the activation of the diesel mode indicator when operating in diesel mode shall be demonstrated at type-approval.

              Note: Installation requirements related to the diesel mode indicator of an approved Type 1B, Type 2B, or Type 3B dual-fuel engine are specified in paragraph 6.2. of this annex.

A.3.1.3. Service mode indicator
              In the case where a dual-fuel engine is type approved as