Air Temperature Sensor ( Ambient / Intake ): Description and Operation

Fig. 1 Air charge temperature (ACT) sensor:

The ACT sensor, Fig. 1, used on EFI models, provides the EFI system mixture (air/fuel) temperature information. The ACT is used as both as a density corrector to air flow calculation and to proportion the cold enrichment fuel flow. This sensor is mounted on an intake manifold runner or on the air cleaner.