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

Kia Rio 2017-2020 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
1.

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")

2.

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
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