SFI SYSTEM 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.

DTCs Component Fail-Safe Operation Fail-Safe Deactivation Condition
P0011, P0015, P0021 and P0025 Variable Valve Timing (VVT) System

  • Idle up (control of combustion worsening)

  • Stopping fuel cut control

 Pass condition detected
P0031, P0032, P0051 and P0052 Air Fuel Ratio Sensor Heater The ECM turns off the A/F sensor heater. Ignition switch off
P0037, P0038, P0057 and P0058 Heated Oxygen Sensor Heater The ECM turns off the HO2 sensor heater. Ignition switch off
P0102, P0103 Mass Air Flow Meter The ECM calculates the ignition timing according to the engine speed and throttle valve position. Pass condition detected
P0112 and P0113 Intake Air Temperature Sensor The ECM estimates the IAT to be 20°C (68°F). Pass condition detected
P0115, P0117 and P0118 Engine Coolant Temperature Sensor The ECM estimates the 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)

The ECM cuts off the throttle actuator current and the throttle valve returns to a throttle position of 7° by the return spring.

The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening 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, P0305 and P0306*2

  • Fuel Injector

  • Electronic Throttle Control System (ETCS)

When a misfire occurs, fuel cut is performed for catalyst overheat malfunction prevention.


  • During normal load and normal engine speed (MIL is blinking):

    - Fuel cut is performed on the malfunctioning cylinder.

  • During high load and high engine speed (MIL is blinking):

    - Throttle valve opening angle control is performed.

    - All cylinder fuel cut or malfunctioning cylinder fuel cut is performed.

 Pass condition detected and then ignition switch turned off
P0327, P0328, P0332 and P0333 Knock Sensor The ECM sets the ignition timing to maximum retard. Ignition switch off
P0351 to P0356 Ignition Coil Assembly The ECM cuts the fuel. Pass condition detected
P0504 Stop light switch The accelerator pedal opening angle is fixed when there is an accelerator pedal malfunction or history of a malfunction. Pass condition detected
P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138 Accelerator Pedal Position Sensor

The APP sensor has 2 sensor circuits: Main and Sub.

If either of the circuits malfunctions, the ECM controls the engine using the other circuit.

If both of the 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
P2432, P2433, P2437, P2438, P2440, P2442, P2445 and P2447 Secondary Air Injection System Throttle valve opening angle control is performed. Pass condition detected

Tech Tips


  • *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.