Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:13:p8
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 13 (pt 8/23)
Character Range: 1964549–1967751

OBD system may erase a fault code and the distance travelled and freeze-frame information if the same fault is not re-registered in at least 40 engine warm-up cycles or 40 driving cycles with vehicle operation in which the following criteria (a)-(c) are satisfied:

                  (a) Cumulative time since engine start is greater than or equal to 600 seconds;

                  (b)  Cumulative vehicle operation at or above 40 km/h occurs for greater than or equal to 300 seconds;

                  (c) Continuous vehicle operation at idle (i.e. accelerator pedal released by driver and vehicle speed less than or equal to 1.6 km/h) for greater than or equal to 30 seconds.

              3.9. Bi-fuelled gas vehicles

               In general, for bi-fuelled gas vehicles for each of the fuel types (petrol and (NG/biomethane)/LPG)) all the OBD requirements as for a mono-fuelled vehicle are applicable. To this end one of the following two options in paragraphs 3.9.1. or 3.9.2. of this annex or any combination thereof, shall be used.

              3.9.1. One OBD system for both fuel types.

              3.9.1.1. The following procedures shall be executed for each diagnostic in a single OBD system for operation on petrol and on (NG/biomethane)/LPG, either independent of the fuel currently in use or fuel type specific:

                  (a) Activation of malfunction indicator (MI) (see paragraph 3.5. of this annex);

                  (b) Fault code storage (see paragraph 3.6. of this annex);

                  (c) Extinguishing the MI (see paragraph 3.7. of this annex);

                  (d) Erasing a fault code (see paragraph 3.8. of this annex).

               For components or systems to be monitored, either separate diagnostics for each fuel type can be used or a common diagnostic.

              3.9.1.2. The OBD system can reside in either one or more computers.

              3.9.2. Two separate OBD systems, one for each fuel type.

              3.9.2.1. The following procedures shall be executed independently of each other when the vehicle is operated on petrol or on (NG/biomethane)/LPG:

                  (a) Activation of malfunction indicator (MI) (see paragraph 3.5. of this annex);

                  (b) Fault code storage (see paragraph 3.6. of this annex);

                  (c) Extinguishing the MI (see paragraph 3.7. of this annex);

                  (d) Erasing a fault code (see paragraph 3.8. of this annex).

              3.9.2.2. The separate OBD systems can reside in either one or more computers.

              3.9.3. Specific requirements regarding the transmission of diagnostic signals from bi-fuelled gas vehicles.

              3.9.3.1.  On a request from a diagnostic scan tool, the diagnostic signals shall be transmitted on one or more source addresses. The use of source addresses is described in the standard listed in paragraph 6.5.3.2.(a) of Appendix 1 to this annex.

              3.9.3.2. Identification of fuel specific information can be realized:

                  (a) By use of source addresses; and/or

                  (b) By use of a fuel select switch; and/or

               (c) By use of fuel specific fault