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
| Function | Warning lamp | DTC No. | Detected area (Error area) | Error area and root cause | ||
|---|---|---|---|---|---|---|
| Fail-safe mode | Turn-ON | C1900 C1901 C1905 C1906 C1907 C1908 C1922 C1925 C1927 C1928 C1933 |
4WAS main control unit | 4WAS main control unit error | ||
| Fail-safe mode | Turn-ON | C1902 C1903 C1904 C1910 C1913 |
4WAS rear motor | 4WAS rear motor error | ||
| Fail-safe mode | Turn-ON | C1909 | 4WAS main control unit | 4WAS main control unit | ||
| Fail-safe mode | Turn-ON | C1911 C1912 |
4WAS rear motor | 4WAS rear motor power supply error | ||
| Fail-safe mode | Turn-ON | C1914 | Rear wheel steering sensor | Rear wheel steering sensor power supply error | ||
| Fail-safe mode | Turn-ON | C1915 C1916 |
Rear wheel steering sensor | Rear wheel steering sensor output voltage error | ||
| Fail-safe mode | Turn-OFF | C1917 | Rear wheel steering sensor | Rear wheel steering sensor (main and sub) output signal value error signal | ||
| Fail-safe mode | Turn-ON | C1918 | Rear wheel steering sensor | Rear wheel steering sensor (main and sub) output signal error | ||
| Fail-safe mode | Turn-ON | C1919 | ABS actuator and electric unit (control unit) | Vehicle speed signal error | ||
| Fail-safe mode | Turn-ON | C1920 C1923 C1924 |
Steering angle sensor | Steering angle sensor input signal error | ||
| Fail-safe mode | Turn-ON | C1921 | ECM | Engine speed signal error | ||
| Fail-safe mode | Turn-ON | C1926 | Steering angle sensor | Steering angle sensor error | ||
| Fail-safe mode | Turn-ON | C1930 | 4WAS front control unit | 4WAS front control unit fail-safe mode | ||
| 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 | ||
| Fail-safe mode | Turn-ON | C1932 | Steering angle sensor | Steering angle sensor input signal error | ||
| Fail-safe mode | Turn-ON | U1000 | CAN communication line (1) | CAN communication error | ||
| Fail-safe mode | 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.
DTC AND ERROR REFERENCE
| Function | Warning lamp | DTC No. | Detected area (Error area) | Error part and root cause |
|---|---|---|---|---|
| Fail-safe mode | Turn-ON | C1919 | ABS actuator and electronic unit (control unit) | Vehicle speed signal error |