Air Suction System Damage Inspection

• Separate the air switching valve hose [A] from the lower air cleaner housing [B] (see Air Cleaner Housing Removal in the Fuel System (DFI) chapter).

• Connect the following parts temporarily.

Fuel Pump Lead Connector [A] Extension Tube [B] Air Cleaner Housing (see Air Cleaner Housing Installation in the Fuel System (DFI) chapter)

Special Tool - Extension Tube: 57001-1578

• Start the engine and run it at idle speed.
• Plug the air switching valve hose end [A] with your finger and feel vacuum pulsing in the hose.

If there is no vacuum pulsation, check the hose line for leak. If there is no leak, check the air switching valve (see Air Switching Valve Unit Test in the Electrical System chapter) or air suction valve (see Air Suction Valve Inspection in the Engine Top End chapter).