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 SYSTEMFAIL-SAFE CHART
2009 Toyota Sequoia Limited, 5.7 Y, RWD
Fail-Safe Chart
2009 Toyota Sequoia Limited, 5.7 Y, RWDSECTION Fail-Safe Chart
WARNING: This page is about a different variant/trim than selected.
If any of the following DTCs are stored, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily.
FAIL-SAFE CHART
| DTC | Component | Fall-Safe Operation | Fail-Safe Deactivation Condition |
|---|---|---|---|
| P0031, P0032, P0051 and P0052 | Air-Fuel Ratio (A/F) Sensor Heater | ECM turns off A/F sensor heater. | Ignition switch off |
| P0037, P0038, P0057 and P0058 | Heated Oxygen (HO2) Sensor Heater | ECM turns off HO2 sensor heater. | Ignition switch off |
| P0102 and P0103 | Mass Air Flow (MAF) Meter | ECM calculates ignition timing according to engine speed and throttle valve position. | Pass condition detected |
| P0110, P0112 and P0113 | Intake Air Temperature (IAT) Sensor | ECM estimates IAT to be 20°C (68°F). | Pass condition detected |
| P0115, P0117 and P0118 | Engine Coolant Temperature (ECT) Sensor | ECM estimates ECT to be 80°C (176°F). | Pass condition detected |
| P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060D, P060E, P0657, P2102, P2103, P2111, P2112, P2118, P2119 and P2135 | Electronic Throttle Control System (ETCS) | ECM cuts off throttle actuator current and throttle valve returned to 7° throttle position by return spring. ECM then adjusts engine output by controlling fuel injection (intermittent fuel-cut) and ignition timing in accordance with accelerator pedal opening angle to allow vehicle to continue at minimal speed*. |
Pass condition detected and then ignition switch turned off |
| P0327, P0328, P0332 and P0333 | Knock Sensor | ECM sets ignition timing to maximum retard. | Ignition switch off |
| P0351 to P0358 | Igniter | ECM cuts fuel. | Pass condition detected |
| P0504 | Stop Light Switch | Accelerator pedal angle is fixed. | Accelerator pedal angle is fixed |
| P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138 | Accelerator Pedal Position (APP) Sensor | APP sensor has 2 sensor circuits: Main and Sub. If either circuit malfunctions, ECM controls engine using other circuit. If both circuits malfunction, ECM regards accelerator pedal as being released. As a result, throttle valve closed and engine idles. |
Pass condition detected and then ignition switch turned off |
| P2432, P2433, P2437 and P2438 | Secondary Air Injection System | Throttle valve opening angle control is performed | Pass condition detected |
| P2440 and P2442 | Secondary Air Injection System | Throttle valve opening angle control is performed | Pass condition detected |
| P2445 and P2447 | Secondary Air Injection System | Throttle valve opening angle control is performed | Pass condition detected |
| HINT: *: The vehicle can be driven slowly when the accelerator pedal is depressed firmly and slowly. If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically. |
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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.