Time to Closed Loop Fuelling

The engine coolant temperature is monitored to ensure it reaches the closed loop fuelling enable temperature. If the Intake Air Temperature is above the required level, the following strategy will be enabled.

A timer is incremented when the engine speed and mass airflow are above pre-determined thresholds. A normal judgement is made if the engine coolant temperature reaches the value for closed loop fuelling before the timer reaches the fault threshold.

A failure judgement is made if the 'load conditions met' timer reaches the fault threshold before the engine coolant temperature reaches the value required for closed loop fuelling.

The fault threshold is obtained from a look up table that is mapped against the engine coolant temperature at engine start.