The air intake system is used to direct cool air from the exterior of the engine compartment to the intake manifold. An air cleaner is incorporated into the system to keep dirt from entering the engine. Some applications also have a PCM controlled turbocharger to increase power, improve driveability and reduce emissions. Refer to the appropriate service area for more information on the turbocharger.

The air cleaner restriction indicator is located in the air cleaner assembly.

If the area inside of the clear section is green, no air filter service is required. If the area inside the clear section is orange and Change Air Filter appears, replace the air filter. The air cleaner restriction indicator can be reset by pushing on the top of the indictor (this will release the vacuum).