Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Problem Symptoms Table

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / A25a-fxs Engine Control / Sfi System / 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 and relays related to this system before inspecting the suspected areas below.

SFI System

Symptom	Suspected Area	Link
Engine does not crank (Does not start)	Hybrid control system
Engine does not crank (Does not start)	VC output circuit (ECM 5 V output)
No initial combustion (Does not start)	ECM power source circuit
	VC output circuit (ECM 5 V output)
	Ignition system
	Fuel system
	Port fuel injector assembly
	Direct fuel injector assembly
	Fuel pump (for low pressure side)
	Crankshaft position sensor
	Intake system
	Valve timing
	EGR valve assembly
Engine cranks normally but difficult to start	ECM power source circuit
	Throttle body with motor assembly
	Fuel pump assembly (for high pressure side)
	Fuel pump (for low pressure side)
	Engine coolant temperature sensor
	Fuel system
	Ignition system
	Compression
	Port fuel injector assembly
	Direct fuel injector assembly
	Crankshaft position sensor
	Intake system
	Valve timing
	EGR valve assembly
Incomplete intermittent combustion occurs (Does not start)	Fuel system
	Fuel pump (for low pressure side)
	Ignition system
	Port fuel injector assembly
	Direct fuel injector assembly
	Crankshaft position sensor
	Intake system
	Valve timing
High engine speed	Throttle body with motor assembly
	ECM power source circuit
	PCV system
Low engine speed (Poor idle)	Fuel system
	Throttle body with motor assembly
	Port fuel injector assembly
	Direct fuel injector assembly
	Fuel pump assembly (for high pressure side)
	PCV system
	Intake system
Rough idle	Flow chart [Rough idling]
	Throttle body with motor assembly
	Port fuel injector assembly
	Direct fuel injector assembly
	Fuel pump assembly (for high pressure side)
	Ignition system
	Air fuel ratio sensor (sensor 1)
	Air fuel ratio sensor (sensor 2)
	Mass air flow meter sub-assembly
	Manifold absolute pressure sensor
	Compression
	Fuel system
	Intake system
	Valve timing
	EGR valve assembly
Hunting (Poor idle)	Throttle body with motor assembly
	ECM power source circuit
	Fuel system
	Spark plug
	Intake system
	Drive start control
Hesitation/Poor acceleration (Poor driveability)	Port fuel injector assembly
	Direct fuel injector assembly
	Fuel system
	Fuel pump assembly (for high pressure side)
	Ignition system
	Intake system
	Valve timing
	Brake override system
	Drive start control
Surging (Poor driveability)	Fuel system
	Fuel pump (for low pressure side)
	Ignition system
	Port fuel injector assembly
	Direct fuel injector assembly
Engine stalls soon after starting	Fuel system
	Throttle body with motor assembly
	Crankshaft position sensor
	Ignition system
	Fuel pump assembly (for high pressure side)
	Intake system
	Valve timing
	EGR valve assembly
MIL (Malfunction Indicator Lamp) malfunction	MIL Circuit
MIL (Malfunction Indicator Lamp) malfunction	Meter/Gauge system
Unable/difficult to refuel	Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.)	-

Precaution

Readiness Monitor Drive Pattern

See More:

Toyota Avalon (XX50) 2019-2022 Owners Manual > Operating the lights and wipers: Headlight switch
The headlights can be operated manually or automatically. Operating instructions Turning the end of the lever turns on the lights as follows: The headlights, daytime running lights and all the lights listed below turn on and off automatically. (When the engine switch is in IGNITION ON mode) ...