Kia Optima: Automatic Transaxle Control System / Inhibitor Switch

Kia Optima DL3 2019-2024 Service and Repair Manual / Automatic Transaxle System / Automatic Transaxle Control System / Inhibitor Switch

Specifications

Specification

Item	Specification
Power supply (V)	4.5 - 5.5 V
Output type	Shifting range (P/R/N/D)	Non-contact(2 channel PWM signal)
	Start, Back-up lamp	Contact

Description and operation

Description

•	The inhibitor switch mounted on the upper of transaxle and connected with shifter lever.

•	The inhibitor switch signals delivered at the TCM according to control of the shift lever positions (P, R, N, D) and it is used to control of the gear setting.

•	When the shift lever is placed in R range, send the output signal to the back-up lamps.

•	When the shift lever is placed in P or N range, send the output signal to the start relay.

Troubleshooting

Components and components location

Component

1. Manual Control Lever

2. Inhibitor Switch

Repair procedures

Inspection

Inspect the following items by referring to inspection flow chart.

(Refer to Inhibitor Switch - "Troubleshooting")

1.	Check the diagnostic trouble codes (DTC) using KDS.

2.	Check that "N" range setting matches. (Refer to Inhibitor Switch - "Installation")

3.	Check the free play for shift cable. (Refer to Shift Cable - "Installation")

Check the condition of connector.

(1)	Inspect connector thoroughly for looseness, poor connection, bending, corrosion, contamination, deformation, or damage.

(2)

Turn ignition key "ON" and engine "OFF" and measure the voltage between the power supplied to inhibitor switch circuit and ground.

Specification : Approx. 12 V

Inspect the wiring connection of junction box power terminal and fuse lamp.

(1)	Check for separation of fuse holder and check that the holder is tightly holding the fuse.

(2)	Attach tester fuse to check that it is connected properly.

(3)	Check if fuse is damaged.

Check the inhibitor switch circuit signal.

(1)	Turn Ignition "ON", & engine "OFF".

(2)	Measure the voltages between each signal terminal and chassis ground in each range (P, R, N, D).

Specification : Approx. 4.5 - 5.5 V

Removal

1.	Shift the gear to "N".

2.	Remove the air cleaner assembly. (Refer to Engine Mechanical System - "Air cleaner")

3.	Disconnect the inhibitor switch connector (A) and loosen the shift cable mounting nut (B).

4.	Remove the manual control lever (A) after loosening the nut and washer.

5.	Remove the inhibitor switch (A) after removing the bolts.

Installation

1.	Check that the gear is shifted to "N".

Install the inhibitor switch (A).

Lightly tighten the inhibitor switch mounting bolts so that necessary adjustments can be made.

Install the manual control lever (A) and washer.

Lightly tighten the manual control lever nut so that necessary adjustments can be made.

4.	Align the hole in the manual control lever with the "N" position hole of the inhibitor switch and then insert the SST inhibitor switch guide pin (09480-A3800).

Tighten the inhibitor switch mounting bolts (A) and manual control lever mounting nut (B) with specified torque.

Tightening torque :

(A) 9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

(B) 17.7 - 24.5 N·m (1.8 - 2.5 kgf·m, 13.0 - 18.1 lb·ft)

6.	Lightly tighten the nut (A) after installing the shift cable (B).

After pushing the nut (A) lightly to direction of arrow to eliminate the free-play, tighten the nut with specified torque.

Tightening torque :

9.8 - 14.7 N·m (1.0 - 1.5 kgf·m, 7.2 - 10.9 lb·ft)

8.	Remove the SST (09480-A3800).

9.	Connect the inhibitor switch connector (A).

10.	Install the air cleaner assembly. (Refer to Engine Mechanical System - "Air cleaner")

11.	Check that operating surely at each range of the inhibitor switch corresponding to each position of shift lever.

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