If the SAS signal is different from calculated value by yaw-rate sensor and wheel speed sensor, mechanically impossible SAS signal is detected, there is a difference between SAS signal and driving condition of the vehicle calculated from yaw-rate sensor and lateral G sensor, a failure is detected.
Item | Detecting Condition | Possible cause | |
DTC Strategy |
•
Signal Monitoring | 1. Short of steering angle sensor circuit 2. Faulty steering angle sensor | |
Case 1 | Monitoring Period |
•
Continueosly on driving | |
Enable Conditions |
•
In case of straight and stable driving over 30kph, monitoring a fault if it is more than 25deg to difference between previous SAS offset and mean of estimated SAS offset | ||
Case 2 | Monitoring Period |
•
Continous (no low- voltage and no errors after IGN on) | |
Enable Conditions |
•
Monitoring a fault if sensor values keep out of the physical range of steer for 600ms | ||
Case 3 | Monitoring Period |
•
Continuous (no low-voltage, no errors and more than 2.75kph speed after IGN on) | |
Enable Conditions |
•
Monitoring a fault if ΔSensor values keep more than 40deg for 40ms. | ||
Case 4 | Monitoring Period |
•
Continuous (during driving) | |
Monitoring Period |
•
In case of stable driving, monitoring a fault if it is more than 10deg to the difference between measured SAS offset and estimated SAS offset | ||
Case 5 | Monitoring Period |
•
Continuous (during driving) | |
Enable Conditions |
•
In case of over 70kph driving, monitoring a fault if conditions between estimated SAS vaules and measured SAS sensor value are not proper to driving status | ||
Fail Safe |
•
Inhibit the ESP(ESC) control and allow the ABS/EBD control
•
The ESP(ESC) warning lamps are activated | ||
