Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:99:p15
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 99 (pt 15/39)
Character Range: 1194436–1197426

to the decision of the manufacturer and may be part of an already existing visual indication system.

              This indicator may be completed by a message display. The system used for displaying the messages referred to in this paragraph may be the same as the ones used for OBD, correct operation of NOx control measures, or other maintenance purposes.

              The visual element of the dual-fuel operating mode indicator shall not be the same as the one used for the purposes of OBD (that is, the MI – malfunction indicator), for the purpose of ensuring the correct operation of NOx control measures, or for other engine maintenance purposes.

              Safety alerts always have display priority over the operating mode indication.

              4.3.1.1. The dual-fuel mode indicator shall be set to service mode as soon as the service mode is activated (i.e. before it becomes actually active) and the indication shall remain as long as the service mode is active.

              4.3.1.2. The dual-fuel mode indicator shall be set for at least one minute on dual-fuel mode or diesel mode as soon as the engine operating mode is changed from diesel to dual-fuel mode or vice-versa. This indication is also required for at least one minute at key-on, or at the request of the manufacturer at engine cranking. The indication shall also be given upon the driver's request

              4.3.2. Empty gaseous fuel tank warning system (dual-fuel warning system)

              A dual-fuel vehicle shall be equipped with a dual-fuel warning system that alerts the driver that the gaseous fuel tank will soon become empty.

               The dual-fuel warning system shall remain active until the tank is refuelled to a level above which the warning system is activated.

              The dual-fuel warning system may be temporarily interrupted by other warning signals providing important safety-related messages.

              It shall not be possible to turn off the dual-fuel warning system by means of a scan-tool as long as the cause of the warning activation has not been rectified.

       4.3.2.1. Characteristics of the dual-fuel warning system

              The dual-fuel warning system shall consist of a visual alert system (icon, pictogram, etc.) left to the choice of the manufacturer.

              It may include, at the choice of the manufacturer, an audible component. In that case, the cancelling of that component by the driver is permitted.

              The visual element of the dual-fuel warning system shall not be the same as the one used for the OBD system (that is, the MI – malfunction indicator), for the purpose of ensuring the correct operation of NOx control measures, or for other engine maintenance purposes.

              In addition the dual-fuel warning system may display short messages, including messages indicating clearly the remaining distance or time before the activation of the operability restriction.

              The