L 290/612
EN
Official Journal of the European Union
10.11.2022
(b) A NOx after treatment system fitted to compression ignition engines as a separate unit or integrated into a combined emission control device; (c) A Diesel Oxidation Catalyst (DOC) fitted to compression ignition engines as a separate unit or integrated into a combined emission control device.
3.3.5.2.
For Level 1A only The devices referred to in paragraph 3.3.5.1. of this annex shall also be monitored for any failure that would result in exceeding the applicable OBD thresholds set out in in paragraph 6.8.2. of this Regulation.
3.4.
A sequence of diagnostic checks shall be initiated at each engine start and completed at least once provided that the correct test conditions are met.
The test conditions shall be selected in such a way that they all occur under normal driving as represented by the Type 1 test.
3.5.
Activation of malfunction indicator (MI)
3.5.1.
The OBD system shall incorporate a malfunction indicator readily perceivable to the vehicle operator.
The MI shall not be used for any other purpose except to indicate emergency start-up, emission default modes or limp-home routines to the driver.
The MI shall be visible in all reasonable lighting conditions.
When activated, it shall display a symbol in conformity with ISO 2575.
A vehicle shall not be equipped with more than one general purpose MI for emission-related problems.
Separate specific purpose tell tales (e. g. brake system, fasten seat belt, oil pressure, etc.) are permitted.
The use of red colour for an MI is prohibited.
3.5.2.
For strategies requiring more than two preconditioning cycles for MI activation, the manufacturer shall provide data and/or an engineering evaluation which adequately demonstrates that the monitoring system is equally effective and timely in detecting component deterioration.
Strategies requiring on average more than ten driving cycles for MI activation are not accepted.
The MI shall also activate whenever the engine control enters a permanent emission default mode of operation if any of the OBD thresholds set out in paragraph 6.8.2. of this Regulation are exceeded or if the OBD system is unable to fulfil the basic monitoring requirements specified in paragraph 3.3.3. or 3.3.4. of this annex.
The MI shall operate in a distinct warning mode, e.g. a flashing light, under any period during which engine misfire occurs at a level likely to cause catalyst damage, as specified by the manufacturer.
The MI shall also activate when the vehicle's ignition is in the "key-on" position before engine starting or cranking and de-activate after engine starting if no malfunction has previously been detected.
3.6.
Fault code storage
3.6.1.
The OBD system shall record pending and confirmed fault code(s) indicating the status of the emission control system.
Separate status codes (readiness codes) shall be used to identify correctly functioning emission control systems and those emission control systems which need further vehicle operation to be fully evaluated.
If the MI is activated due to deterioration or malfunction or permanent emission default modes of operation, a fault code shall be stored that identifies the type of malfunction.
A fault code shall also be stored in the cases referred to in paragraphs 3.3.3.5. and 3.3.4. (e) of this annex.
3.6.2.
The distance travelled by the vehicle while the MI is activated shall be available at any instant through the serial port on the standard link connector.
3.6.3.
In the case of vehicles equipped with positive ignition engines, misfiring cylinders need not be uniquely identified if a distinct single or multiple cylinder misfire fault code is stored.
3.7.
Extinguishing the MI
3.7.1.
If misfire at levels likely to cause catalyst damage (as specified by the manufacturer) is not present any more, or if the engine is operated after changes to speed and load conditions where the level of misfire will not cause catalyst damage, the MI may be switched back to the previous state of activation during the first driving cycle on which the misfire level was detected and may be switched to the normal activated mode on subsequent driving cycles.
If the MI is switched back to the previous state of activation, the corresponding fault codes and stored freeze-frame conditions may be erased.