SYSTEM DIAGRAM 
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Tire Pressure Warning System(for Gasoline Model): Transmitter ID not Registered (Main) (C2171)
DESCRIPTION The IDs of each tire pressure warning valve and transmitter are registered to the tire pressure warning ECU and receiver. When the ECU detects that a transmitter ID code is not registered in the ECU, this DTC is stored. DTC No. Detection Item DTC Detection Condition Trouble Area Note C21 ...
