Kia Rio YB Quiz
Automatic Transmission

Transmission Control Module (TCM)

In this manual: Automatic Transmission
General Information — 8Maintenance — 31Engine Mechanical System — 44Engine Electrical System — 14Emission Control System — 9Engine Control System/Fuel System — 30Clutch System — 10Manual Transmission — 10Automatic Transmission — 23Drive Shaft and Axle — 8Suspension System — 15Steering — 9Restraints — 14Brake System — 22Body (Interior and Exterior) — 115Body Electrical System — 84Heating, Ventilation, and Air Conditioning — 28
6steps
~36min
2/5difficulty
0102030405011.89N·mlb·ft
Tightening torque found on this page
Done 0 of 6

Description and Operation

Description

The module receives and processes signals from various sensors and devices to control the transmission and provide optimal driving conditions for the driver.

Functions

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

  • Performs gear shifting when the current gear position differs from the identified optimal gear position.

  • Determines whether to activate the torque converter clutch and engages the clutch accordingly.

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

  • Diagnoses malfunctions and failures of the automatic transmission.

Circuit 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 "D" Lock-Up Switch Input
58 "R" Lock-Up Switch Input
62 Manual Mode "Up" Switch
64 Power
68 Ground
79 Oil Temperature Sensor (-)
80 Transmission Fluid Temperature Sensor (+)
84 "P" Lock-Up Switch Input
85 Power
87 Ground
88 Ground
99 Output Speed Sensor Signal (+)
100 Input Speed Sensor Signal (+)
104 "N" Inhibitor Switch 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

Wiring Diagram

Repair Procedures

Inspection

  1. TCM Ground Circuit Inspection: Measure the resistance between the TCM and chassis ground. (Inspect the terminal connected to chassis ground at the rear of the harness connector as the check point on the TCM side.)

    Specification: Less than 1 ohm

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

  3. If the problem is not found in steps 1 and 2, the TCM may be faulty.

    If so, replace the TCM with a new one, then recheck the vehicle. If the vehicle operates normally, the problem was most likely caused by the TCM.

  4. Recheck the original TCM: Install the original (suspected faulty) TCM in a known good vehicle and check the vehicle. If the problem recurs, replace the original TCM with a new one.

    If the problem does not recur, it is intermittent and another part may be faulty.

Removal

  1. Remove the battery.

    (Refer to Engine Electrical System - Battery)

  2. Disconnect the TCM connectors (A), then remove the TCM after loosening the bolts and nuts.

    Tightening Torque: 9.8–11.8 N·m

Installation

  1. Install in the reverse order of removal.

Test yourself

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