Kia Forte: Manual Transaxle System / Vehicle Speed Sensor

Kia Forte 2019-2021 (BD) Service Manual / Manual Transaxle System / Manual Transaxle System / Vehicle Speed Sensor

Specifications
Specification

Item
 Specification 
Type
Hall sensor
Working voltage
 6.5 -1 5V 
Output voltage
VL ≤ 0.5 V
(When output current is 15mA flows)

Description and operation
Description

Component location : Manual transaxle case

Operation principle : Vehicle Speed Sensor (VSS) is hall sensor type and senses the rotating speed of differential gear.

Function

Comparing engine speed with vehicle speed calculated based on vehicle speed sensor signal, ECM recognizes engaged gear.

Based on the information about engaged gear, ECM performs optimum fuel injection quantity correction.

VSS signal is also used in speed meter of cluster, A/C control module, BCM, etc.

Repair procedures
Inspection

W/Harness Inspection

1.

Check the vehicle speed sensor by using the KDS.

(if normal, current vehicle speed is display)

2.

Check if current vehicle speed is same as vehicle speed displayed on the KDS.

3.

Check the damage to the connectors and wiring.

4.

Check the power.

(1)

Turn ignition switch OFF.

(2)

Disconnect the vehicle speed sensor.

(3)

Turn ignition switch ON.

(4)

Check the voltage of the power terminal.

Specification : 11.5V - 13.0V

5.

Check the signal.

(1)

Turn ignition switch OFF.

(2)

Disconnect the vehicle speed sensor.

(3)

Turn ignition switch ON.

(4)

Check the voltage of the signal terminal.

Specification : 8.0V - 11.5V

6.

Check the ground.

(1)

Turn ignition switch OFF.

(2)

Disconnect the vehicle speed sensor.

(3)

Turn ignition switch ON.

(4)

Check the voltage between signal terminal and body ground.

(5)

Check the voltage between signal terminal and ground terminal.

Specification : (4) - (5) = Within 200mV

Component Inspection

1.

IG KEY "OFF", ENGINE "OFF".

2.

Disconnect the vehicle speed sensor connector.

3.

Disconnect the vehicle speed sensor and driven gear.

4.

Check the wear of spline (A).

5.

Check rotating state of vehicle speed sensor driven gear.

6.

Connect the vehicle speed sensor connector and IG KEY "ON".

7.

Rotate the driven gear with hand.

Specification : Vehicle Speed Signal generates.

Removal
1.

Remove the air cleaner assembly and air duct.

(Refer to Engine Mechanical System - "Air Cleaner")

2.

Remove the battery and battery tray.

(Refer to Engine Electrical System - "Battery")

3.

Disconnect the vehicle speed sensor connector (A).

4.

Remove the vehicle speed sensor (A) and driven gear.

Tightening torque:

5.9 - 7.8 N·m (0.6 - 0.8 kgf·m, 4.3 - 5.8 lb·ft)

  

After removing speed sensor, be careful not to enter dust, foreign matters, etc in speed sensor hole.

5.

Separate the vehicle speed sensor (A) and driven gear (B).

Installation
1.

Install in the reverse order of removal.

  

Do not reuse the O-ring (A).

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