Work Procedure
Open hood and remove cover from air cleanerSection A
Check Material Of Mass Air Flow Sensor (MAS)
^ If MAS is aluminum, NO FURTHER WORK IS NECESSARY; reinstall cover on air cleaner and close hood
^ If MAS is plastic, proceed to Section B
Section B
Check Screen In MAS
^ Switch ignition to "OFF" position
^ Loosen clamps -5- on air hose -6- between MAS -4- and intake air duct -10- and remove air hose
^ Disconnect electrical connector from MAS
^ Disconnect and remove tie wrap -1- from metal bracket -8-
^ Remove 4 bolts -7- securing MAS, then remove MAS
^ With MAS removed, check screen installation inside MAS.
^ If adhesive is present at the outer edge, (metal frame around screen is covered with adhesive) proceed to Section D
^ If no adhesive is present (metal frame around screen is visible), proceed to Section C
^ If no screen is present in MAS, find old screen and return to AoA with old MAS
^ Install new MAS (part # 078 133 471 C)
DO NOT INSTALL RETAINING RING IN NEW MAS.
^ Proceed to Section D
Section C
Retaining Ring Installation
^ Install retaining ring -9- (part # 078 133 553) with stepped side toward screen into MAS -4- by pushing in retaining ring until it is flush with end of MAS
^ Proceed to Section D
Section D
Re-assembly
^ Reinstall MAS using 4 screws -7- and tighten to 10 Nm (7 ft lb.)
NOTE:
MAKE CERTAIN SEAL -3- IS POSITIONED CORRECTLY BEFORE INSTALLING MAS
^ Reinstall tie wrap -1- in metal bracket -8-
^ Reconnect electrical connector to MAS
^ Reinstall air hose -6- between MAS -4- and intake air duct -10- and tighten clamps
^ Reinstall cover on air cleaner