Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2009SEQUOIA LIMITED, 5.7 Y, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 27 (ENGINE CONTROL SYSTEM (2UZ-FE) - DIAGNOSTIC INTRODUCTION)SFI SYSTEMPROBLEM SYMPTOMS TABLE
2009 Toyota Sequoia Limited, 5.7 Y, RWD
Problem Symptoms Table
2009 Toyota Sequoia Limited, 5.7 Y, RWDSECTION Problem Symptoms Table
WARNING: This page is about a different variant/trim than selected.
HINT:
Use the table below to help determine the cause of the problem symptom. 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.
SFI System
SFI SYSTEM PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See information |
|---|---|---|
| Engine does not crank (Does not start) | Battery | ON-VEHICLE INSPECTION |
| Starter | INSPECTION | |
| Cranking holding function circuit | CRANKING HOLDING FUNCTION CIRCUIT | |
| Starter relay | ON-VEHICLE INSPECTION | |
| Park/neutral position switch (for 2WD) | ON-VEHICLE INSPECTION | |
| Park/neutral position switch (for 4WD) | ON-VEHICLE INSPECTION | |
| Immobiliser system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| No initial combustion (Does not start) | ECM power source circuit | ECM POWER SOURCE CIRCUIT |
| Crankshaft position sensor | CRANKSHAFT POSITION SENSOR | |
| VVT sensor | CAMSHAFT POSITION SENSOR | |
| Ignition system | IGNITION SYSTEM | |
| Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |
| ECM | TERMINALS OF ECM | |
| VC output circuit | VC OUTPUT CIRCUIT | |
| Engine cranks normally but difficult to start | Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| Fuel pump | INSPECTION | |
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |
| ECM power source circuit | ECM POWER SOURCE CIRCUIT | |
| Engine coolant temperature sensor | ENGINE COOLANT TEMPERATURE SENSOR | |
| Air induction system | ON-VEHICLE INSPECTION | |
| Ignition system | IGNITION SYSTEM | |
| Spark plug | IGNITION SYSTEM | |
| Electronic throttle control system | THROTTLE BODY | |
| Compression | ON-VEHICLE INSPECTION | |
| Difficult to start with cold engine | Ignition system | IGNITION SYSTEM |
| Spark plug | IGNITION SYSTEM | |
| Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |
| Injector | INSPECTION | |
| Difficult to start with warm engine | Fuel injector circuit | FUEL INJECTOR CIRCUIT |
| Injector | INSPECTION | |
| Ignition system | IGNITION SYSTEM | |
| Spark plug | IGNITION SYSTEM | |
| Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| High engine idle speed | Electronic throttle control system | THROTTLE BODY |
| A/C signal circuit | HOW TO PROCEED WITH TROUBLESHOOTING | |
| ECM power source circuit | ECM POWER SOURCE CIRCUIT | |
| Acoustic Control Induction System (ACIS) | ACIS CONTROL CIRCUIT | |
| Low engine idle speed (Poor idling) | Electronic throttle control system | THROTTLE BODY |
| A/C signal circuit | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Fuel pump | INSPECTION | |
| Air induction system | ON-VEHICLE INSPECTION | |
| Acoustic Control Induction System (ACIS) | ACIS CONTROL CIRCUIT | |
| PCV hose | ON-VEHICLE INSPECTION | |
| Rough idling | Compression | ON-VEHICLE INSPECTION |
| Spark plug | IGNITION SYSTEM | |
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |
| Injector | INSPECTION | |
| Ignition system | IGNITION SYSTEM | |
| Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Fuel pump | INSPECTION | |
| Electronic throttle control system | THROTTLE BODY | |
| Air induction system | ON-VEHICLE INSPECTION | |
| Acoustic Control Induction System (ACIS) | ACIS CONTROL CIRCUIT | |
| PCV hose | ON-VEHICLE INSPECTION | |
| Mass air flow meter | MASS AIR FLOW METER | |
| Idle hunting | Electronic throttle control system | THROTTLE BODY |
| Air induction system | ON-VEHICLE INSPECTION | |
| ECM power source circuit | ECM POWER SOURCE CIRCUIT | |
| Acoustic Control Induction System (ACIS) | ACIS CONTROL CIRCUIT | |
| Hesitation/Poor acceleration | Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| Fuel pump | INSPECTION | |
| Spark plug | IGNITION SYSTEM | |
| Ignition system | IGNITION SYSTEM | |
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |
| Injector | INSPECTION | |
| Mass air flow meter | MASS AIR FLOW METER | |
| Electronic throttle control system | THROTTLE BODY | |
| Air induction system | ON-VEHICLE INSPECTION | |
| Compression | ON-VEHICLE INSPECTION | |
| Surging (Poor driveability) | Spark plug | IGNITION SYSTEM |
| Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Fuel pump | INSPECTION | |
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |
| Ignition system | IGNITION SYSTEM | |
| Injector | INSPECTION | |
| Mass air flow meter | MASS AIR FLOW METER | |
| Variable valve timing system | CAMSHAFT OIL CONTROL VALVE | |
| Compression | ON-VEHICLE INSPECTION | |
| Engine stalls soon after starting | Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| Fuel pump | INSPECTION | |
| Spark plug | IGNITION SYSTEM | |
| Ignition system | IGNITION SYSTEM | |
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |
| Injector | INSPECTION | |
| Variable valve timing system | CAMSHAFT OIL CONTROL VALVE | |
| Electronic throttle control system | THROTTLE BODY | |
| Air induction system | ON-VEHICLE INSPECTION | |
| PCV hose | ON-VEHICLE INSPECTION | |
| Compression | ON-VEHICLE INSPECTION | |
| Engine stalls only during A/C operation | A/C signal circuit | HOW TO PROCEED WITH TROUBLESHOOTING |
| ECM | TERMINALS OF ECM | |
| Unable/difficult to refuel | Refueling valve (canister) | - |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.