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DTC C1260 Steering Angle Sensor-Signal: DTC Detecting Condition

DETECTING CONDITION AND POSSIBLE CAUSE

Item Detecting Condition Possible cause
Case 1 DTC Strategy
  • N-Signal Consistency Monitoring
  • Open or short of steering wheel sensor circuit
  • Faulty steering wheel sensor
Monitoring Period
  • Once per loop
Enable Conditions
  • N signal changing point must be specified position compared with last changing point. If the changing point differs more than 4degree, the failure is detected.
    • To avoid miss detection of failure, Changing point monitoring ignores the short term changing (less than 70ms).
  • If N signal does not change more than 352 degree, failure is fixed.
Fail Safe
  • The TCS/ESC functions are deactivated.
  • The TCS/ESC warning lamps are activated.
    • This monitoring is not done when power-supply state is not normal.
Case 2 DTC Strategy
  • Power-Supply-Short-Term-Defect Monitoring
Monitoring Period
  • Once per loop
Enable Conditions
  • Difference between measured steering-angle and expected-steering angle exceeds 6 degree.
  • Too high velocity of steering-angle is measured.
  • Expecting-steering-angle is made while power-supply state is out of range.
Fail Safe
  • The TCS/ESC functions are deactivated.
  • The TCS/ESC warning lamps are activated.
Case 3 DTC Strategy
  • Signal Plausibility Monitoring
Monitoring Period
  • Continuously (once per loop) if the vehicle speed is above 10.8kph(6.7mile), but not checked.
    1. during detected low voltage
    2. during maneuvers with variable speed and steering
    3. during skidding or during reverse driving started after a signal setting time of 1.8s after power-on reset.
Enable Conditions
  • A failure is detected during steady-state straight ahead driving if one of the following conditions is true longer than 1.75s.
    1. |longitudinal acceleration| > 0.1 g AND |difference| > 3.0
    2. -0.1 g < longitudinal acceleration < -0.05g OR 0.0g < longitudinal acceleration < 0.1 g AND |difference| > 6.0
    3. -0.05g < longitudinal acceleration < 0.0g AND|difference| > 9.0
      • The difference : the difference between the reference signal and the steering angle sensor signal.
      • A steering angle reference signal is calculated from the wheel speeds, the lateral acceleration and the yaw rate to observe the steering wheel angle sensor.
Fail Safe
  • The TCS/ESC functions are deactivated.
  • The TCS/ESC warning lamps are activated.
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