SFI SYSTEM PROBLEM SYMPTOMS TABLE

Tip:

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.

Table 1. SFI System:
Symptom	Suspected Area	Link
Engine does not crank (Does not start)	Entry and Start System (w/ Entry and Start System)	Click here
	Battery	Click here
	Starter signal circuit	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
	Speed sensor (crankshaft position sensor)	Click here
	Fuel pump control circuit	Click here
	Ignition system	Click here
	Fuel injector circuit	Click here
	Valve timing (check for loose or jumped teeth on timing belt)	Click here
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 with motor assembly	Click here
Incomplete intermittent combustion occurs (Does not start)	Fuel pump control circuit	Click here
	Fuel pump	Click here
	Fuel line	-
	Ignition system	Click here
	Fuel injector assembly	Click here
	Speed sensor (crankshaft position sensor)	Click here
	Valve timing (check for loose or jumped teeth on timing belt)	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 with motor assembly	Click here
	Intake system	Click here
	Engine coolant temperature sensor	Click here
	ECM power source circuit	Click here
	Emission control system (ventilation connector)	Click here
Low engine speed (Poor idle)	Fuel pump control circuit	Click here
	Throttle body with motor assembly	Click here
	Intake system	Click here
	Emission control system (ventilation connector)	Click here
Engine stalls on deceleration	Idle speed (refer to "Low engine speed" symptom)	-
Rough idle	Compression	Click here
	Heated oxygen sensor (sensor 1)	Click here
	Heated oxygen sensor (sensor 2)	Click here
	Air pressure sensor assembly	Click here
	Ignition system	Click here
	Fuel line	-
	Fuel pump	Click here
	Intake system	Click here
	Emission control system (ventilation connector)	Click here
	External part malfunction (Increase in load: A/C system, etc.)	-
Hunting (Poor idle)	Emission control system (ventilation connector)	Click here
	Air pressure sensor assembly	Click here
	Heated oxygen sensor (sensor 1)	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 (check for loose or jumped teeth on timing belt)	Click here
	Air pressure sensor assembly	Click here
	Throttle body with motor assembly	Click here
	Compression	Click here
	Fuel injector assembly	Click here
	Ignition system	Click here
	Knock control sensor	Click here
Surging (Poor driveability)	Fuel line	-
	Fuel pump control circuit	Click here
	Fuel pump	Click here
	Ignition system	Click here
	Fuel injector assembly	Click here
Engine stalls soon after starting	Air pressure sensor assembly	Click here
	Intake system	Click here
	Fuel line	-
	Valve timing (check for loose or jumped teeth on timing belt)	Click here