Steering Angel Sensor Check

Ignition "ON" & Engine "ON".
Turn the steering wheel to the left or right.
Measure waveform between signal terminal of the steering angle sensor harness connector and chassis ground with oscilloscope.
Specification : Check the voltage range (HIGH : 2.9±0.1V ~ 4.4±0.1V LOW : 1.2±0.1V ~ 2.1 ±0.1 V) of the sensor signal in case of turning left, turning right, center position.

If normal waveforms such as Fig 1, Fig 1, Fig 1 are detected in each condition, It is normal.

NORMAL WAVEFORM

Fig 1: Oscilloscope Waveform Graph (1 Of 3)
Courtesy of HYUNDAI MOTOR CO.

Fig 2: Oscilloscope Waveform Graph (2 Of 3)
Courtesy of HYUNDAI MOTOR CO.

Fig 3: Oscilloscope Waveform Graph (3 Of 3)
Courtesy of HYUNDAI MOTOR CO.
Is the measured waveform within specifications?
YES:
- Fault is intermittent caused by poor connection in steering sensor harness and/or HECU's connector.
  Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO:
- If STN signal is HIGH on center position, Check for improper installation of steering angle sensor Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- If sensor mounting state is normal, Substitute with a known-good steering angle sensor and check for proper operation.
  If problem is corrected, replace steering angle sensor and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.