Check PCM/TCM

Ignition "ON" & Engine "OFF".
Connect "OUTPUT SPEED SENSOR" connector.
Install scan tool and sleet a SIMU-SCAN,
Simulate frequency to OUTPUT SPEED SENSOR signal circuit.

Fig 1: Monitor Scan Tool Display - Throttle Position Sensor
Courtesy of HYUNDAI MOTOR CO.

* The values are subject to change according to vehicle model or conditions
Is "OUTPUT SPEED SENSOR" signal value changed according to simulation frequency?
YES
- Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Substitute with a known-good PCM/TCM and check for proper operation. If the problem is corrected, replace PCM/TCM as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.