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HOMESERVICE MANUALSTOYOTA2009COROLLA S, 1.8 U, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM (2ZR-FE) - SFI SYSTEM DIAGNOSTIC INTRODUCTION, PRECAUTIONS, PROBLEM SYMPTOMS TABLE, FAIL-SAFE CHART, DIAGNOSTIC TROUBLE CODE (DTC) CHARTSFI SYSTEMFAIL-SAFE CHART
2009 Toyota Corolla S, 1.8 U, Standard

Fail-Safe Chart

2009 Toyota Corolla S, 1.8 U, StandardSECTION Fail-Safe Chart

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

FAIL-SAFE OPERATION CHART

DTC Component Fail-Safe Operation Fail-Safe Deactivation Condition
P0031
P0032		 Air fuel ratio sensor heater ECM turns off air fuel ratio sensor heater Ignition switch off
P0037
P0038		 Heated oxygen sensor heater ECM turns off heated oxygen sensor heater Ignition switch off
P0102
P0103		 Mass air flow meter ECM calculates ignition timing according to engine speed and throttle valve position Pass condition detected
P0110
P0112
P0113		 Intake air temperature sensor ECM estimates intake air temperature to be 20°C (68°F) Pass condition detected
P0115
P0117
P0118		 Engine coolant temperature sensor ECM estimates engine coolant temperature to be 80°C (176°F) Pass condition detected
P0120
P0121
P0122
P0123
P0220
P0222
P0223
P0601
P0604
P0606
P0607
P060A
P060D
P060E
P0657
P1607
P2102
P2103
P2111
P2112
P2118
P2119
P2135		 Electronic throttle control system ECM cuts off throttle actuator current and throttle valve returns to the 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*2
  • Fuel injector
  • Electronic throttle control system
 When a catalyst damaging 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 malfunctioning cylinder fuel cut performed
 Pass condition detected and then ignition switch turned off
P0325
P0327
P0328		 Knock Sensor ECM sets ignition timing to maximum retard Ignition switch off
P0351 to P0354 Igniter ECM cuts fuel Pass condition detected
P2120
P2121
P2122
P2123
P2125
P2127
P2128
P2138		 Accelerator pedal position sensor Accelerator pedal position sensor has 2 sensor circuits: Main and Sub.
If either circuit malfunctions, ECM controls engine using the other circuit.
If both circuits malfunction, the ECM regards the accelerator pedal as being released. As a result, the throttle valve is closed and the 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.
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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.