Component Inspection

Ignition "ON" & Engine "ON".
Turn the steering wheel to the left or right.
Measure signal waveform between terminal "3, 4, 5" of the steering angle sensor harness connector and chassis ground.
Specification : Check the voltage range (HIGH : 2.9 ± 0.1V ~ 4.4 ± 0.1V, LOW : 1.2 ± 0.1V ~ 2.1 ± 0.1V) of the sensor signal in case of turning left, turning right, center position. If normal waveforms such as fig 1, 2, 3 are detected in each condition, It is normal.

Fig 1: Waveform Signal Graph
Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Measuring Signal Waveform Between Terminal "3, 4, 5" Of Steering Angle Sensor Connector Ground
Courtesy of KIA MOTORS AMERICA, INC.
Is the measured signal waveform within specifications?
YES
- Fault is intermittent caused by poor connection in steering sensor harness and/or HECU's connector or was repaired and HECU memory was not cleared. 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 OK, 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.