Toyota Avalon (XX50): Problem Symptoms Table

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / 2gr-fks 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)	Battery
	ST relay
	Starter assembly
	Starter signal circuit
	Smart key system (for start function)
	VC output circuit (ECM 5 V output)
	Park/neutral position switch assembly
No initial combustion (Does not start)	Immobiliser system
	ECM power source circuit
	VC output circuit (ECM 5 V output)
	Ignition system
	Fuel pump control circuit
	Fuel injector assembly (for port injection)
	Fuel injector assembly (for direct injection)
	Crankshaft position sensor
	Intake system
	Valve timing
	No. 1 valve rocker arm sub-assembly*
Engine cranks normally but difficult to start	ECM power source circuit
	Flow chart [Engine difficult to start]
	Throttle body with motor assembly
	Fuel pump assembly (for high pressure side)
	Fuel pump (for low pressure side)
	Engine coolant temperature sensor
	Fuel pump control circuit
	Ignition system
	Spark plug
	Compression
	Fuel injector assembly (for port injection)
	Fuel injector assembly (for direct injection)
	Crankshaft position sensor
	Intake system
	Valve timing
	No. 1 valve rocker arm sub-assembly*
Incomplete intermittent combustion occurs (Does not start)	Fuel pump control circuit
	Ignition system
	Fuel injector assembly (for port injection)
	Fuel injector assembly (for direct injection)
	Crankshaft position sensor
	Intake system
	Valve timing
High engine speed	Throttle body with motor assembly
	ECM power source circuit
	PCV hose
	PCV system
Low engine speed (Poor idle)	Fuel pump control circuit
	Throttle body with motor assembly
	Fuel injector assembly (for port injection)
	Fuel injector assembly (for direct injection)
	Fuel pump assembly (for high pressure side)
	PCV hose
	PCV system
	Intake system
Rough idle	Flow chart [Rough idling]
	Throttle body with motor assembly
	Fuel injector assembly (for port injection)
	Fuel injector assembly (for direct injection)
	Fuel pump assembly (for high pressure side)
	Ignition system
	Compression
	Fuel pump control circuit
	Spark plug
	Intake system
	Valve timing
	No. 1 valve rocker arm sub-assembly*
Hunting (Poor idle)	Throttle body with motor assembly
	ECM power source circuit
	Fuel pump control circuit
	Spark plug
	Intake system
	Drive start control
Hesitation/Poor acceleration (Poor driveability)	Fuel injector assembly (for port injection)
	Fuel injector assembly (for direct injection)
	Fuel pump control circuit
	Fuel pump assembly (for high pressure side)
	Ignition system
	Spark plug
	Intake system
	Valve timing
	No. 1 valve rocker arm sub-assembly*
	Brake override system
	Drive start control
Lack of power	Flow chart [Lack of power]
Surging (Poor driveability)	Fuel pump control circuit
	Spark plug
	Fuel injector assembly (for port injection)
	Fuel injector assembly (for direct injection)
	No. 1 valve rocker arm sub-assembly*
Engine stalls soon after starting	Flow chart [Engine stalls]
	Fuel pump control circuit
	Throttle body with motor assembly
	Crankshaft position sensor
	Ignition system
	Fuel pump assembly (for high pressure side)
	Intake system
	Valve timing
Engine stalls soon after slow down	Flow chart [Engine stalls]
	Fuel injector assembly (for port injection)
	Fuel injector assembly (for direct injection)
	Throttle body with motor assembly
	ECM
	Crankshaft position sensor
	Ignition system
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.)	-
Drive mode does not change	Drive mode switch circuit
Engine vibrates frequently when idling (Active control engine mount system)	Active control engine mount circuit

HINT:

*: Check "Fuel Cut Elapsed Time" in the Data List. If the elapsed time is over 0 sec, then the engine speed is high (the engine speed at which fuel cut occurs + 500 rpm or more). In this situation, there is a possibility that a No. 1 valve rocker arm sub-assembly will become loose and malfunction, check that the No. 1 valve rocker arm sub-assemblies are properly installed.

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ECM/PCM Engine Off Timer Performance Signal Invalid (P261029,P261093). Parts Location. Precaution

Readiness Monitor Drive Pattern. Registration. Rough Idling

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