Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p34
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 34/59)
Character Range: 699628–702577

start-up or limp-home routines to the driver. Safety related messages can be given the highest priority. The MI must be visible in all reasonable lighting con- ditions. When activated, it must display a symbol in conformity with ISO 2575 (1) (as a dashboard telltale lamp or a symbol on a dashboard dis- play). A vehicle must not be equipped with more than one general purpose MI for emission-related problems. Displaying separate specific information is permitted (e.g. such as information dealing with brake system, fasten seat belt, oil pressure, servicing requirements, or indicating the lack of necessary reagent for the deNOx system). The use of red for the MI is prohibited.

             (1) Symbol numbers F01 or F22.

             3.6.2. The MI may be used to indicate to the driver that an urgent service task needs to be carried out. Such an indication may also be accompanied by an appropriate message on a dashboard display that an urgent servicing requirement needs to be carried out.

             3.6.3. For strategies requiring more than a preconditioning cycle for MI activation, the manufacturer must provide data and/or an engineering evalua- tion which adequately demonstrates that the monitoring system is equally effective and timely in detecting component deterioration. Strategies requiring on average more than ten OBD or emission test cycles for MI activation are not accepted.

             3.6.4. The MI must also activate whenever the engine control enters a permanent emission default mode of operation. The MI must also activate if the OBD system is unable to fulfil the basic monitoring requirements specified in this Directive.

             3.6.5. Where reference is made to this section, the MI must be activated and, in addition, a distinct warning mode should also be activated, e.g. flashing MI or activation of a symbol in conformity with ISO 2575 (1) in addition to MI activation.

             3.6.6. The MI must activate when the vehicle's ignition is in the 'key-on' position before engine starting or cranking and de-activate within 10 seconds after engine starting if no malfunction has previously been detected.

             3.7. Fault code storage

              The OBD system must record fault code(s) indicating the status of the emission-control system. A fault code must be stored for any detected and verified malfunction causing MI activation and must identify the malfunctioning system or component as uniquely as possible. A separate code should be stored indicating the expected MI activation status (e.g. MI commanded 'ON', MI commanded 'OFF').

              Separate status codes must be used to identify correctly functioning emission control systems and those emission control systems that need fur- ther engine operation to be fully evaluated. If the MI is activated due to malfunction or permanent emission default modes of operation, a fault code must be stored that identifies the