Component Inspection

ABS Vehicle 

1. ENG "ON".
2. Measure signal waveform of Vehicle Speed from ABS to ECM while driving.
   1. Specification :
      Fig 1: Vehicle Speed Sensor - Signal Waveform

      Courtesy of KIA MOTORS AMERICA, INC.
3. Is the signal waveform normal?

   YES

   1. Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
      CAUTION: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM.
      Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others

   NO

   1. Substitute with a known - good ABS control unit and check for proper operation. If the problem is corrected, replace ABS control unit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Non-ABS Vehicle 

1. Engine "ON".
2. Measure signal waveform of wheel speed sensor while driving.
   1. Specification :
      Fig 2: Wheel Speed Sensor - Signal Waveform

      Courtesy of KIA MOTORS AMERICA, INC.
3. Is the signal waveform normal?

   YES

   1. Substitute with a known - good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
      CAUTION: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM.
      Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others

   NO

   1. Substitute with a known - good wheel speed sensor and check for proper operation. If the problem is corrected, replace wheel speed sensor and go to "VERIFICATION OF VEHICLE REPAIR " procedure.