April 5, 2026: LEMON Manuals is launched! Read the announcement.

Component Inspection

Check "INPUT SPEED SENSOR"

Ignition "OFF".
Disconnect the INPUT SPEED "SENSOR" connector.
Measure resistance between terminal "1", "2" and "2","3" and "1","3" of the "INPUT SPEED SENSOR" connector.

Fig 1: Identifying Resistance Between Terminal And Of Input Speed Sensor Connector
Courtesy of HYUNDAI MOTOR CO.

Is resistance within specifications?

[REFERENCE DATA]

RESISTANCE REFERENCE DATA

Data	Reference Data
Current	22 mA
Air Gap	Input sensor	1.3 mm
Air Gap	Output sensor	0.85 mm
Resistance	1 (red)-2 (black)	Infinite
	1 (black) - 2(red)	Approx. 3.89 MΩ
	1 (red) - 3 (black)	Approx. 6.55 MΩ
	1 (black) - 3 (red)	Approx. 5.27 MΩ
	2 (red) - 3 (black)	Approx. 17.5 MΩ
	2 (black) - 3 (red)	Infinite

YES : --> Go to step 2 "CHECK PCM/TCM" below.

NO : --> Replace "INPUT SPEED SENSOR" as necessary and Go to "VERIFICATION OF VEHICLE REPAIR " procedure.

CHECK PCM/TCM
1. Ignition "ON" & Engine "OFF".
2. Connect "INPUT SPEED SENSOR" connector.
3. Install scan tool and select a SIMU-SCAN.
4. Simulate frequency to INPUT SPEED SENSOR signal circuit.
  
  Fig 2: Scan Tool Display - Input Speed Sensor
  Courtesy of HYUNDAI MOTOR CO.
5. Is "INPUT 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.