Description And Operation: Operation

ACTIVE GRILL SHUTTER OPERATION

The AGS assembly contains an integral smart module
The module receives a command position signal from the Powertrain Control Module (PCM) to properly position the shutter vanes
The AGS module reports the position to the PCM on the Local Interface Network (LIN) bus
The AGS module four-pin connector contains a battery voltage, ignition voltage, and a ground circuit
Controlled by the PCM over a dedicated network LIN bus
When the ambient air and engine coolant temperatures are below a specified threshold, airflow across the radiator is not required
When airflow across the radiator is not required and vehicle speeds reach a calibrated threshold, the PCM will command the shutter vanes to close
Closing the grill shutter vanes creates an improved drag coefficient across the front of the vehicle
If additional cooling is required due to increasing engine coolant temperatures, the PCM commands the grill shutter vanes to open
In cold climates, the active grill shutter system may be used to improve engine coolant warm-up times, further increasing fuel economy
To aid with diagnosis, the grill shutter vanes can be commanded to the open or closed positions with a scan tool

Initialization

AGS validation

Start the engine and observe the grill shutters
Depending on the position at key on, the AGS will cycle to the full open and the full closed positions to initialize and learn the hard stops on the grill shutter frame for that key cycle
If the AGS module detects the grill shutters are jammed, it will attempt to free them by cycling the shutters from the open to close positions 3 times
If this condition is detected when the ambient air temperature is greater than 4.4° C (40° F), the MIL will illuminate and a diagnostic trouble code (DTC) will set
If the ambient air temperature is below 4° C (39.2° F) and a jammed condition is detected, the smart module will assume the shutters are frozen and will not illuminate the MIL or set a DTC