Component Inspection

Ignition "ON" & Engine "ON".
Turn the steering wheel to the left or right.
Measure signal waveform between terminal "1, 4, 5" of the steering wheel 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 are detected in each condition, It is normal.

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

Fig 2: Measuring Signal Waveform Between Steering Wheel Angle Sensor Connector Terminal 1 And Chassis 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.