PROCEDURE
(a) Set treble, middle and bass to the initial values and check that the sound is normal. OK: The sound returns to normal.
(a) Compare with another vehicle of the same model which is not malfunctioning to see if there is any difference in the sound quality. OK: No difference is found.
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Toyota Tundra Service Manual > Air Switching Valve(for Bank 1): Installation
INSTALLATION PROCEDURE 1. INSTALL AIR SWITCHING VALVE ASSEMBLY (a) Install a new gasket and the air switching valve assembly with the 3 bolts. Torque: 24 N·m {245 kgf·cm, 18 ft·lbf} Text in Illustration *1 Air Switching Valve Assembly *2 No. 4 Air Tube *a Claw NOTICE: Make sure the gasket's claws ...