This function allows fueling correction to compensate for changes in inlet air temperature. Hotter air is less dense than colder air and so as air temperature increases there will be less oxygen available to burn in the combustion chambers. Without IAT correction an engine will run richer on a hotter day and leaner on a cooler day, while this is desirable to some extent the change is typically more than what is required.

 

The IAT Mode can be set to ON or turned OFF completely, if no IAT sensor is installed, this setting should be set to OFF.

 

Note: It is recommended that all applications use intake temperature correction, IAT Correction requires that an intake temperature sensor be installed and and the IAT Analog Input to be configured correctly.

 

Note: Ideally, the correction at 20C should be set to zero, at air temperatures below this the correction should be positive to provide enrichment and at air temperatures above this the correction should be negative to reduce the fuel delivery.

 

The IAT Fuel Trim Table allows the enrichment at different intake temperatures to be dependent on engine load. The IAT Fuel Trim Table should be set up with one axis representing intake air temperature (usually IAT) and the other representing engine load.