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 > Meter / Gauge System: Tachometer Malfunction
DESCRIPTION The combination meter assembly receives engine speed signals from the ECM via the CAN line. The combination meter assembly displays engine speed data that is calculated based on the data received from the ECM. WIRING DIAGRAM PROCEDURE 1. CHECK CAN COMMUNICATION SYSTEM (a) Check if a CAN ...