Kia Rio: Automatic Transaxle Control System / Transaxle Control Module (TCM)

Kia Rio 2017-2023 YB Service Manual / Automatic Transaxle System / Automatic Transaxle Control System / Transaxle Control Module (TCM)

Description and operation

Description

The module receives and processes signals from various sensors and implements a wide range of transaxle controls to ensure optimal driving conditions for the driver.

Functions

•	Monitors the vehicle's operating conditions to determine the optimal gear setting.

•	Performs a gear change if the current gear setting differs from the identified optimal gear setting.

•	Determines the need for torque converter clutch activation and engages the clutch accordingly.

•	Calculates the optimal line pressure level by constantly monitoring the torque level and adjusts the pressure accordingly.

•	Diagnoses the faults and failures for automatic transaxle.

Schematic diagrams

TCM Terminal Function

Connector [A]

Pin	Description
3	PCSV-D
4	PCSV-A
5	LINE_VFS
24	PCSV-B
43	PCSV-C
45	SCSV-A
54	Manual mode "select" switch
57	Inhibitor switch "D" input
58	Inhibitor switch "R" input
62	Manual mode "up" switch
64	Power
68	Ground
79	Oil temperature sensor (-)
80	Oil temperature sensor (+)
84	Inhibitor switch "P" input
85	Power
87	Ground
88	Ground
99	Output speed sensor (+) signal
100	Input speed sensor (+) signal
104	Inhibitor switch "N" input
105	Manual mode "down" switch

Connector [K]

Pin	Description
5	Engine control relay "ON" input
43	Output speed sensor ground
82	Input speed sensor ground

Circuit Diagram

Repair procedures

Inspection

TCM ground circuit test : Measure the resistance between TCM and chassis ground. (Inspect the terminal connected to the chassis ground with the back of harness connector as the inspection point of TCM side.)

Specification : Below 1Ω

2.	TCM connector test : Disconnect the TCM connector and visually check the ground terminals on TCM side and harness side for bent pins or poor contact pressure.

3.	If problem is not found in Steps 1 and 2, the TCM could be faulty. If so, replace the TCM with a new one, and then check the vehicle again. If the vehicle operates normally then the problem was likely with the TCM.

4.	Reinspection of original TCM : Install the original TCM (probably broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original TCM with a new one. If the problem does not reoccur, this is an intermittentproblem and other part may be faulty.

Removal

1.	Remove the battery. (Refer to Engine Electrical System - "Battery")

Disconnect the TCM connectors (A) and then remove the TCM after loosening the bolts and nut.

Tightening torque :

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

Installation

1.	Install in the reverse order of removal.

•	Perform the TCM adaptive values learning procedure after replacing the TCM.

•	After replacing the TCM, perform the ECM-related procedures. (Refer to Engine Control / Fuel System - "Engine Control Module")

❮Automatic Transaxle Control System

Description and operation Description Automatic transaxle control system relies on various measurements to determine the current control status and determine the necessary compensation values.

Transaxle Oil Temperature Sensor❯

Specifications Specification Item Specification Type *NTC thermistor Temp.

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