Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: 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 areas in the order they are listed. Replace parts as necessary.
Inspect the fuses related to this system before inspecting the suspected areas below.

Symptom	Suspected Area	Link
Cooling fan does not operate	Engine coolant temperature sensor
	EFI-MAIN NO. 1 relay
	Cooling fan circuit
	Fan with motor assembly	-
	ECM
Cooling fan does not stop (continues to operates)	Engine coolant temperature sensor
	Cooling fan circuit
	Fan with motor assembly	-
	ECM
Cooling fan speed does not change	Cooling fan circuit
	Fan with motor assembly	-
	ECM

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Dynamic Radar Cruise Control System(for Gasoline Model): Driving Support ECU (C1A01)
DESCRIPTION This DTC indicates an internal malfunction of the driving support ECU assembly. DTC No. Detection Item DTC Detection Condition Trouble Area MIL C1A01 Driving Support ECU When the engine switch is on (IG) and the dynamic radar cruise control system is operating, the driving support ECU as ...

Toyota Avalon (XX50) 2019-2022 Owners Manual