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 > Throttle Body: Removal
REMOVAL PROCEDURE 1. REMOVE NO. 1 ENGINE UNDER COVER 2. DRAIN ENGINE COOLANT 3. REMOVE V-BANK COVER SUB-ASSEMBLY 4. REMOVE AIR CLEANER HOSE ASSEMBLY 5. REMOVE THROTTLE BODY ASSEMBLY (a) Disconnect the 2 water by-pass hoses. (b) Disconnect the throttle position sensor and control motor connector. (c) ...