DESCRIPTION The stereo component amplifier assembly receives a vehicle speed signal from the combination meter assembly to control the ASL function. HINT:
WIRING DIAGRAM PROCEDURE
(a) Check the input waveform.
(1) Remove the stereo component amplifier assembly with the connector(s) still connected. (2) Connect an oscilloscope to terminal G8-11 (SPD) and body ground. (3) Turn the engine switch on (IG). (4) Turn a wheel slowly. (5) Check the signal waveform according to the condition(s) in the table below.
OK: The waveform is similar to that shown in the illustration. HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Hybrid Control System: Drive Motor "A" Control Module Internal Electronic Failure (P0A1B49)
DESCRIPTION The motor generator control ECU (MG ECU), which is built into the inverter with converter assembly, monitors its internal operation and will store DTCs if the system is malfunctioning. DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate P0A1B49 Drive Motor "A ...