TERMINALS OF ECU CHECK TIRE PRESSURE WARNING ECU AND RECEIVER (a) Disconnect the K11 tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side. 
(b) Connect the K11 tire pressure warning ECU and receiver connector. (c) Measure the voltage according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning. HINT: Measure the values on the wire harness side while the connector is connected. 
(d) Using an oscilloscope, check waveform 1. 
HINT: The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal. |
Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Electric Parking Brake System(for Gasoline Model): Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected ...
