SFI SYSTEM PROBLEM SYMPTOMS TABLE

Tip:

Use the table below to help determine the cause of a problem. The likely causes of the problem are indicated in descending order. Check each suspected area in order. Repair or replace faulty parts or perform adjustments as necessary.


Symptom	Suspected Area	Link
Engine does not crank (Does not start)	Battery	Click here
	Starter signal circuit	Click here
	Entry and start system	Click here
	VC output circuit (ECM 5 V output)	Click here
No initial combustion (Does not start)	Immobiliser system (w/ Entry and Start System)	Click here
	Immobiliser system (w/o Entry and Start System)	Click here
	ECM power source circuit	Click here
	VC output circuit (ECM 5 V output)	Click here
	Crankshaft position sensor	Click here
	Fuel pump control circuit	Click here
	Ignition system	Click here
	Fuel injector circuit	Click here
	Valve timing	Click here Click here
	No. 1 valve rocker arm sub-assembly*	-
Engine cranks normally but difficult to start	Fuel pump control circuit	Click here
	Fuel pump	Click here
	Engine coolant temperature sensor	Click here
	Ignition system	Click here
	Fuel injector assembly	Click here
	Compression	Click here
	Fuel injector circuit	Click here
	ECM power source circuit	Click here
	Intake system	Click here
	Throttle body assembly	Click here
	Starter signal circuit	Click here
	No. 1 valve rocker arm sub-assembly*	-
Incomplete intermittent combustion occurs (Does not start)	Fuel pump control circuit	Click here
	Fuel pump	Click here
	Fuel lines	-
	Ignition system	Click here
	Fuel injector assembly	Click here
	Crankshaft position sensor	Click here
	Starter signal circuit	Click here
	Valve timing	Click here Click here
High engine speed (Poor idle)	Air conditioning signal circuit (for Automatic Air Conditioning System)	Click here
	Air conditioning signal circuit (for Manual Air Conditioning System)	Click here
	Throttle body assembly	Click here
	Intake system	Click here
	Engine coolant temperature sensor	Click here
	ECM power source circuit	Click here
	PCV hose	-
	PCV valve	Click here
Low engine speed (Poor idle)	Fuel pump control circuit	Click here
	Throttle body assembly	Click here
	Intake system	Click here
	PCV hose	-
	PCV valve	Click here
Engine stalls on deceleration	Idle speed (refer to "Low engine speed" symptom)	-
Rough idle	Compression	Click here
	Air fuel ratio sensor	Click here
	Heated oxygen sensor	Click here
	Mass air flow meter sub-assembly	Click here
	Ignition system	Click here
	Fuel lines	-
	Fuel pump	Click here
	Intake system	Click here
	PCV hose	-
	PCV valve	Click here
	No. 1 valve rocker arm sub-assembly*	-
	External part malfunction (Increase in load: A/C system, CVT system, etc.)	-
Hunting (Poor idle)	PCV hose	-
	PCV valve	Click here
	Mass air flow meter sub-assembly	Click here
	Air fuel ratio sensor	Click here
Engine stalls during air conditioning operation	Air conditioning signal circuit (for Automatic Air Conditioning System)	Click here
	Air conditioning signal circuit (for Manual Air Conditioning System)	Click here
	ECM	Click here
Hesitation/Poor acceleration (Poor driveability)	Fuel line	-
	Fuel pump	Click here
	Valve timing	Click here Click here
	Mass air flow meter sub-assembly	Click here
	Throttle body assembly	Click here
	Knock sensor	Click here
	Fuel injector assembly	Click here
	Ignition system	Click here
	Compression	Click here
	Brake override system	Click here
	No. 1 valve rocker arm sub-assembly*	-
Surging (Poor driveability)	Fuel line	-
	Fuel pump control circuit	Click here
	Fuel pump	Click here
	Ignition system	Click here
	Fuel injector assembly	Click here
	No. 1 valve rocker arm sub-assembly*	-
Engine stalls soon after starting	Mass air flow meter sub-assembly	Click here
	Intake system	Click here
	Fuel line	-
	Valve timing	Click here Click here
	No. 1 valve rocker arm sub-assembly*	-

Tip:

*: Check "Fuel Cut Elps Time" in the Data List. If the elapsed time is over 0 sec, then the engine speed is high (More than the engine speed at which fuel cut occurs + 500 rpm). When this has happened, there is a possibility that the No. 1 valve rocker arm sub-assembly will become loose and malfunction, so check that the No. 1 valve rocker arm sub-assembly is properly attached (Click here).