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HOMESERVICE MANUALSTOYOTA20094RUNNER LIMITED, 4.0 U, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEM (1GR-FE)SFI SYSTEMFAIL-SAFE
2009 Toyota 4Runner Limited, 4.0 U, RWD

SFI System: Fail-Safe

2009 Toyota 4Runner Limited, 4.0 U, RWDSECTION Fail-Safe

If any of the following DTCs are set, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily.

FAIL-SAFE TABLE

DTCs Components Fail-Safe Operations Fail-Safe Deactivation Conditions
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
P0100, 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, P0607, 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 6° 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*1		 Pass condition detected and then ignition switch turned off
P0300 P0301 P0302 P0303 P0304 P0305 P0306*2
  • Fuel injector
  • Electronic Throttle Control System (ETCS)
 When catalyst damage misfire occurs (MIL blinking), following fail-safe operation performed for catalyst overheat malfunction prevention
  1. Under low load and low engine speed
    • Fuel cut performed on malfunctioning cylinder
  2. Under high load and high engine speed
    • Throttle valve opening angle control is performed
    • All cylinder fuel cut or malfunction cylinder fuel cut
 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 P0356 Igniter ECM cuts fuel Pass condition detected
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 of circuits malfunctions, ECM controls engine using the other circuit
If both of circuits malfunction, ECM regards accelerator pedal as being released. As a result, throttle valve is closed and engine idles		 Pass condition detected and then ignition switch turned off
HINT:
  • *1: 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.
  • *2: Misfire related fail-safe operations occur when catalyst overheat malfunctions occur.
RENDER: 1.0x

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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.