Fail Safe
4WAS system (Main)
- 4WAS system enters in the fail-safe mode (4WAS system stopped) and 4WAS warning lamp turns ON if an error is detected in 4WAS system (4WAS main control unit) component part.
- 4WAS system enters in the protection function mode (4WAS system temporarily stopped) if 4WAS system continues the heavy load condition or the sensor self-check condition. (4WAS system reactivates automatically if the heavy load condition and the self-check condition are resolved.) 4WAS warning lamp stays OFF in the protection function mode.
FAIL SAFE CHART
| Mode | Warning lamp | DTC | Detected area (Error area) | Error area and root cause | ||
|---|---|---|---|---|---|---|
| Fail-safe | Turn-ON | C1900 C1901 C1905 C1906 C1907 C1908 C1922 C1925 C1927 C1928 C1933 |
4WAS main control unit | 4WAS main control unit error | ||
| Turn-ON | C1902 C1903 C1904 C1910 C1913 |
4WAS rear motor | 4WAS rear motor error | |||
| Turn-ON | C1909 | 4WAS main control unit | 4WAS main control unit | |||
| Turn-ON | C1911 C1912 |
4WAS rear motor | 4WAS rear motor power supply error | |||
| Turn-ON | C1914 | Rear wheel steering sensor | Rear wheel steering sensor power supply error | |||
| Turn-ON | C1915 C1916 |
Rear wheel steering sensor | Rear wheel steering sensor output voltage error | |||
| Turn-OFF | C1917 | Rear wheel steering sensor | Rear wheel steering sensor (main and sub) output signal value error signal | |||
| Turn-ON | C1918 | Rear wheel steering sensor | Rear wheel steering sensor (main and sub) output signal error | |||
| Turn-ON | C1919 | ABS actuator and electric unit (control unit) | Vehicle speed signal error | |||
| Turn-ON | C1920 C1923 C1924 |
Steering angle sensor | Steering angle sensor input signal error | |||
| Turn-ON | C1921 | ECM | Engine speed signal error | |||
| Turn-ON | C1926 | Steering angle sensor | Steering angle sensor error | |||
| Turn-ON | C1930 | 4WAS front control unit | 4WAS front control unit fail-safe mode | |||
| Turn-ON | C1931 | 4WAS communication line(1)/4WAS front control unit/4WAS main control unit | 4WAS communication line(1)/4WAS front control unit/4WAS main control unit error | |||
| Turn-ON | C1932 | Steering angle sensor | Steering angle sensor input signal error | |||
| Turn-ON | U1000 | CAN communication line(1) | CAN communication error | |||
| Turn-ON | U1010 | CAN communication line(1)/4WAS main control unit/ECM/ABS actuator and electric unit (control unit) | CAN communication line/4WAS main control unit/ECM/ABS actuator and electric unit (control unit) error | |||
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EPS system
- EPS system (4WAS main control unit) enters the fail-safe mode (that allows the steering force to be controlled without impairing the drive ability) if the input from each sensor is not within the specified range. Then, 4WAS warning lamp turns ON.
FAIL SAFE CHART
| Mode | Warning lamp | DTC | Detected area (Error area) | Error part and root cause |
|---|---|---|---|---|
| Fail-safe | Turn-ON | C1919 | ABS actuator and electronic unit (control unit) | Vehicle speed signal error |