Toyota Yaris: Sfi System / Problem Symptoms Table

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (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)	Engine difficult to start
	Engine difficult to start (Vehicle Control History Code: X0810 and/or X0812)
	Auxiliary battery
	Starter assembly
	Starter signal circuit
	Entry and start system (for start function)
	VC output circuit (ECM 5 V output)
	Clutch start switch assembly
	Stop and Start System
No initial combustion (Does not start)	Engine difficult to start
	Engine difficult to start (Vehicle Control History Code: X0810 and/or X0812)
	Immobiliser system
	ECM power source circuit
	VC output circuit (ECM 5 V output)
	Ignition system
	Fuel pump control circuit
	Port fuel injector assembly
	Direct fuel injector assembly
	Crankshaft position sensor
	Intake system
	Valve timing
	No. 1 valve rocker arm sub-assembly*
Engine cranks normally but difficult to start	Engine difficult to start
	Engine difficult to start (Vehicle Control History Code: X0810 and/or X0812)
	ECM power source circuit
	Throttle body with motor assembly
	Fuel pump assembly (for high pressure side)
	Engine coolant temperature sensor
	Fuel pump control circuit
	Ignition system
	Spark plug
	Compression
	Port fuel injector assembly
	Direct fuel injector assembly
	Crankshaft position sensor
	Intake system
	Valve timing
	No. 1 valve rocker arm sub-assembly*
Incomplete intermittent combustion occurs (Does not start)	Engine difficult to start
	Engine difficult to start (Vehicle Control History Code: X0810 and/or X0812)
	Fuel pump control circuit
	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 hose
	PCV system
Low engine speed (Poor idle)	Rough idling
	Fuel pump control circuit
	Throttle body with motor assembly
	Port fuel injector assembly
	Direct fuel injector assembly
	Fuel pump assembly (for high pressure side)
	PCV hose
	PCV system
	Intake system
	No. 1 turbo pressure sensor
Rough idle	Rough idling
	Throttle body with motor assembly
	Port fuel injector assembly
	Direct fuel injector assembly
	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*
	No. 1 turbo pressure sensor
Hunting (Poor idle)	Rough idling
	Throttle body with motor assembly
	ECM power source circuit
	Fuel pump control circuit
	Spark plug
	Intake system
Hesitation/Poor acceleration (Poor driveability)	Rough idling
	Port fuel injector assembly
	Direct fuel injector assembly
	Fuel pump control circuit
	Lack of Power (Turbocharger System)
	Fuel pump assembly (for high pressure side)
	Ignition system
	Spark plug
	Intake system
	Valve timing
	No. 1 turbo pressure sensor
	Waste gate valve (turbocharger sub-assembly)
	Waste gate valve actuator assembly (turbocharger sub-assembly)
	Air by-pass valve assembly
	Turbocharger sub-assembly
	No. 1 valve rocker arm sub-assembly*
	Brake override system
Lack of power	Lack of power
	Lack of power (Vehicle Control History Code: X0844 and/or X0845)
	Lack of Power (Turbocharger System)
	No. 1 turbo pressure sensor
	Waste gate valve (turbocharger sub-assembly)
	Waste gate valve actuator assembly (turbocharger sub-assembly)
	Air by-pass valve assembly
	Turbocharger sub-assembly
Surging (Poor driveability)	Rough idling
	Fuel pump control circuit
	Spark plug
	Port fuel injector assembly
	Direct fuel injector assembly
	No. 1 valve rocker arm sub-assembly*
Engine stalls soon after starting	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
	No. 1 turbo pressure sensor
Engine stalls soon after slow down	Engine stalls
	Port fuel injector assembly
	Direct fuel injector assembly
	Throttle body with motor assembly
	ECM
	Crankshaft position sensor
	Ignition system
	Air by-pass valve assembly
MIL (malfunction indicator lamp) malfunction	MIL Circuit
MIL (malfunction indicator lamp) malfunction	Meter/Gauge system
White smoke emitted	Turbocharger oil leak and white smoke
Turbocharger noise	Turbocharger noise

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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