Document ID: chunk:federal_register_of_legislation:F2024L00446:front:0:p26
Version: federal_register_of_legislation:F2024L00446
Segment Type: other
Provision Reference: 
Character Range: 74007–77164

except as authorised by the manufacturer. The manufacturer shall authorise modifications if those modifications are necessary for the diagnosis, servicing, inspection, retrofitting or repair of the vehicle. Any reprogrammable computer codes or operating parameters shall be resistant to tampering and afford a level of protection at least as good as the provisions in ISO 15031-7: 2013. Any removable calibration memory chips shall be potted, encased in a sealed container or protected by electronic algorithms and shall not be changeable without the use of specialized tools and procedures.
6.1.7.1.1. Only features directly associated with emissions calibration or prevention of vehicle theft may be protected in accordance with paragraph 6.1.7.1.
6.1.7.2. Computer-coded engine operating parameters shall not be changeable without the use of specialized tools and procedures (e.g. soldered or potted computer components or sealed (or soldered) enclosures).
6.1.7.3. Manufacturers may seek approval from the responsible authority for an exemption to one of these requirements for those vehicles that are unlikely to require protection. The criteria that the responsible authority shall evaluate in considering an exemption shall include, but are not limited to, the current availability of performance chips, the high-performance capability of the vehicle and the projected sales volume of the vehicle.
              6.1.7.4. Manufacturers using programmable computer code systems shall deter unauthorised reprogramming. Manufacturers shall include enhanced tamper protection strategies and write-protect features requiring electronic access to an off-site computer maintained by the manufacturer. Methods giving an adequate level of tamper protection shall be approved by the responsible authority.

              6.1.8. Rounding

              Unless specified elsewhere in this Regulation, paragraphs 6.1.8.1. and 6.1.8.2. provide rules for rounding to fulfil the requirements of this Regulation.

              6.1.8.1. When the digit immediately to the right of the last place to be retained is less than 5, that last digit retained shall remain unchanged.

              Example:

              If a result is 1.234 grams but only two places of decimal are to be retained, the final result shall be 1.23 grams.

              6.1.8.2. When the digit immediately to the right of the last place to be retained is greater than or equal to 5, that last digit retained shall be increased by 1.

              Example:

              If a result is 1.236 grams but only two places of decimal are to be retained, and because 6 is greater than 5, the final result shall be 1.24 grams.

6.1.9. The use of defeat devices that reduce the effectiveness of emission control systems shall be prohibited. The prohibition shall not apply where:
                  (a) The need for the device is justified in terms of protecting the engine against damage or accident and for safe operation of the vehicle;
                  (b) The device does not function beyond the requirements of engine starting;
or
                  (c) The conditions are substantially included