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Home >> Scion >> 2015 >> iQ >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics - Introduction) >> SFI System >> Problem Symptoms Table [08/2014 - ] >> Problem Symptoms Table [08/2014 - ]

Problem Symptoms Table [08/2014 - ]

HINT: 

SFI SYSTEM

Symptom Suspected Area See
Engine does not crank (Does not start) Battery Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 1
Starter relay Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 1
Starter (except Cold Area) Refer to INSPECTION [08/2014 - ]
Starter (for Cold Area) Refer to INSPECTION [08/2014 - ]
Park/neutral position switch Refer to INSPECTION [08/2014 - ]
Starter signal circuit Refer to Starter Signal Circuit [08/2014 - ]
No initial combustion (Does not start) ECM power source circuit Refer to ECM Power Source Circuit [08/2014 - ]
Crankshaft position sensor Refer to INSPECTION PROCEDURE
Ignition system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Fuel pump control circuit Refer to Fuel Pump Control Circuit [08/2014 - ]
Fuel pump Refer to INSPECTION [08/2014 - ]
Fuel injector circuit Refer to Fuel Injector Circuit [08/2014 - ]
Valve timing Refer to PROCEDURE - Step 5
VC output circuit (ECM 5 V output) Refer to VC Output Circuit [08/2014 - ]
Camshaft position sensor (for intake camshaft) Refer to INSPECTION PROCEDURE
Camshaft position sensor (for exhaust camshaft) Refer to INSPECTION PROCEDURE
Starter signal circuit Refer to Starter Signal Circuit [08/2014 - ]
Engine immobiliser system (w/ engine immobiliser system) Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2014 - ]
ECM Refer to TERMINALS OF ECM [08/2014 - ] 
Engine cranks normally but difficult to start Fuel pump control circuit Refer to Fuel Pump Control Circuit [08/2014 - ]
Fuel pump Refer to INSPECTION [08/2014 - ]
Fuel injector circuit Refer to Fuel Injector Circuit [08/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [08/2014 - ]
Starter signal circuit Refer to Starter Signal Circuit [08/2014 - ]
Engine coolant temperature sensor Refer to INSPECTION [08/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Spark plug Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 3
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Compression Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 10
Incomplete intermittent combustion occurs (Does not start) Fuel pump control circuit Refer to Fuel Pump Control Circuit [08/2014 - ]
Fuel pump Refer to INSPECTION [08/2014 - ]
Fuel line Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Ignition circuit Refer to INSPECTION PROCEDURE
Ignition system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Fuel injector circuit Refer to Fuel Injector Circuit [08/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [08/2014 - ]
Starter signal circuit Refer to Starter Signal Circuit [08/2014 - ]
Crankshaft position sensor Refer to INSPECTION PROCEDURE
Camshaft position sensor (for intake camshaft) Refer to INSPECTION PROCEDURE
Camshaft position sensor (for exhaust camshaft) Refer to INSPECTION PROCEDURE
Engine immobiliser system (w/ engine immobiliser system) Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2014 - ]
Valve timing Refer to PROCEDURE - Step 5
High engine idle speed Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
A/C signal circuit Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [08/2014 - ]
Engine coolant temperature sensor Refer to INSPECTION [08/2014 - ]
PCV valve and hose Refer to COMPONENTS [08/2014 - ]
Low engine idle speed (Poor idling) Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [08/2014 - ]
A/C signal circuit Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2014 - ]
Fuel pump control circuit Refer to Fuel Pump Control Circuit [08/2014 - ]
Fuel pump Refer to INSPECTION [08/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
PCV valve and hose Refer to COMPONENTS [08/2014 - ]
Rough idling Compression Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 10
Ignition system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Spark plug Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 3
Fuel injector circuit Refer to Fuel Injector Circuit [08/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [08/2014 - ]
Fuel pump control circuit Refer to Fuel Pump Control Circuit [08/2014 - ]
Fuel pump Refer to INSPECTION [08/2014 - ]
Fuel line Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Purge VSV Refer to INSPECTION [08/2014 - ]
PCV valve and hose Refer to COMPONENTS [08/2014 - ]
Air fuel ratio sensor Refer to INSPECTION PROCEDURE
Heated oxygen sensor Refer to INSPECTION PROCEDURE
Mass air flow meter Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Knock sensor Refer to INSPECTION [08/2014 - ]
External part malfunction (Increase in load: A/C system, CVT system, etc.) -
Hunting (Poor idling) Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
PCV valve and hose Refer to COMPONENTS [08/2014 - ]
Air fuel ratio sensor Refer to INSPECTION PROCEDURE
Mass air flow meter Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Hesitation/poor acceleration Fuel pump control circuit Refer to Fuel Pump Control Circuit [08/2014 - ]
Fuel pump Refer to INSPECTION [08/2014 - ]
Fuel line Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Spark plug Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 3
Ignition system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Fuel injector circuit Refer to Fuel Injector Circuit [08/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [08/2014 - ]
Mass air flow meter Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Valve timing Refer to PROCEDURE - Step 5
Compression Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 10
Brake override system Refer to Brake Override System [08/2014 - ]
Surging (Poor driveability) Spark plug Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 3
Fuel pump control circuit Refer to Fuel Pump Control Circuit [08/2014 - ]
Fuel pump Refer to INSPECTION [08/2014 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Fuel injector circuit Refer to Fuel Injector Circuit [08/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [08/2014 - ]
Mass air flow meter Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Variable Valve Timing (VVT) system Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 1
Compression Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 10
Engine stalls soon after starting Fuel pump control circuit Refer to Fuel Pump Control Circuit [08/2014 - ]
Fuel pump Refer to INSPECTION [08/2014 - ]
Spark plug Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 3
Ignition system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Fuel injector circuit Refer to Fuel Injector Circuit [08/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [08/2014 - ]
Mass air flow meter Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Variable Valve Timing (VVT) system Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 1
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [08/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [08/2014 - ]
PCV valve and hose Refer to COMPONENTS [08/2014 - ]
Compression Refer to ON-VEHICLE INSPECTION [08/2014 - ] - Step 10
Engine stalls only during A/C operation A/C signal circuit Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2014 - ]
ECM Refer to TERMINALS OF ECM [08/2014 - ] 
Unable/difficult to refuel Fuel system (canister, roll over valve, fuel tank, etc.) -