Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:4
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 4
Character Range: 775977–777699

4                          Cautions and Warnings

4.1                     Cautions

      A vehicle equipped with an SCR system should be provided with caution lamps, which shall engage and inform the driver to take corrective measures when the following conditions are detected:

4.1.1              the urea solution injection rate is incorrect;

4.1.2              the level of urea solution in the tank falls below the level required for 300km of normal operation; or

4.1.3              the urea solution is of abnormal quality (not meeting the requirements of clause 2).

4.2                     Warnings

      An additional warning lamp and an audible warning (buzzer) shall be activated under the following conditions:

      4.2.1            where no corrective action is taken within 300km after the first caution lamp is engaged under clause 4.1 in response to the detection of the conditions of clause 4.1.1;

      4.2.2            where no corrective action is taken within 300km after the first caution lamp is engaged under clause 4.1 in response to the detection of the conditions of clause 4.1.3; or

4.2.3              where the tank containing the urea solution is empty.

4.3                     The onboard diagnostics system of the vehicle shall record a fault code when any of the conditions of clause 4.2 are met.

4.4                     All caution and warning lamps shall be clearly visible from the driver's seating position.

4.5                     The vehicle shall be able to confirm that the SCR system is operating normally, prior to the start of driving.

4.6                     The reason for the triggering of the different caution and warning lamps shall be clear to the driver.