Sfi System (For Hatchback) Fail-Safe Chart

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

Sfi System (For Hatchback) -- Fail-Safe Chart


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

DTC Code
Component
Fail-Safe Operation
Fail-Safe Deactivation Condition
P0011
VVT system
  1. Idle up (Control of combustion worsening)
  2. Stopping fuel-cut control
Pass condition detected
P0031
P0032
P101D
Air fuel ratio sensor heater
The ECM turns off the air fuel ratio sensor heater.
Ignition switch off
P0037
P0038
P102D
Heated oxygen sensor heater
The ECM turns off the heated oxygen sensor heater.
Ignition switch off
P0102
P0103
Mass air flow meter
The ECM calculates ignition timing according to the engine speed and throttle valve position.
Pass condition detected
P0112
P0113
Intake air temperature sensor
The ECM estimates the intake air temperature to be 20°C (68°F).
Pass condition detected
P0115
P0117
P0118
Engine coolant temperature sensor
The ECM estimates the engine coolant temperature to be 80°C (176°F).
Pass condition detected
P0120
P0121
P0122
P0123
P0220
P0222
P0223
P0604
P0606
P060A
P060B
P060D
P060E
P0657
P2102
P2103
P2111
P2112
P2118
P2119
P2135
Electronic throttle control system
The ECM cuts off throttle actuator current and the throttle valve is returned to a 6.0° throttle position by the return spring.
The ECM then adjusts the engine output by controlling fuel injection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal angle to allow the vehicle to continue at minimal speed*1.
Pass condition detected and then ignition switch turned off
P0300
P0301
P0302
P0303
P0304
*2
  1. Fuel injector assembly
  2. Electronic throttle control system
When a catalyst-damaging misfire occurs (MIL blinking), the following fail-safe operation is performed for catalyst overheat malfunction prevention.
  1. Under a low load and at a low engine speed:
    - Fuel cut is performed on the malfunctioning cylinder.
  2. Under a high load and at a high engine speed:
    - Throttle valve opening angle control is performed.
    - Fuel cut is performed on all cylinders or the malfunctioning cylinder.
Pass condition detected and then ignition switch turned off
P0327
P0328
Knock sensor
The ECM sets the ignition timing to maximum retard.
Ignition switch off
P0351
P0352
P0353
P0354
Ignition coil
The ECM cuts the fuel injection.
Pass condition detected
P2120
P2121
P2122
P2123
P2125
P2127
P2128
P2138
Accelerator pedal position sensor
The accelerator pedal position sensor has 2 sensor circuits: Main and Sub.
If either circuit malfunctions, the ECM controls the 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
P2237
P2238
P2239
P2252
P2253
Air Fuel Ratio Sensor
  1. Air fuel ratio feedback control is stopped.
  2. Current to the air fuel ratio sensor heater is cut.
Pass condition detected and then ignition switch turned off
HINT:
  1. *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. *2: Misfire-related fail-safe operations occur when catalyst overheat malfunctions occur.