Division 2.3.5

Except as permitted by point 2.3.2, an auxiliary emission control strategy may solely be activated for the following purposes:

1. (a)

   by on-board signals, for protecting the engine (including air-handling device protection) and/or non-road mobile machinery into which the engine is installed from damage;

2. (b)

   for operational safety reasons;

3. (c)

   for prevention of excessive emissions, during cold start or warming-up, during shut-down;

4. (d)

   if used to trade-off the control of one regulated pollutant under specific ambient or operating conditions, for maintaining control of all other regulated pollutants, within the emission limit values that are appropriate for the engine concerned. The purpose is to compensate for naturally occurring phenomena in a manner that provides acceptable control of all emission constituents.