Hyundai Elantra (CN7): Dual Clutch Transmission Control System / DCT Control Module (TCM)

Hyundai Elantra (CN7) 2021-2025 Service Manual / DCT(Dual Clutch Transmission) System / Dual Clutch Transmission Control System / DCT Control Module (TCM)

Description and operation

Description

•

Function

The Transmission Control Module (TCM) is like the brain for the Dual Clutch Transmission (DCT). It receives information from various sensors for a wide range of transmission controls to provide an optimal driving environment for the driver. The TCM is programmed for optimal operation in all driving conditions. If the TCM malfunctions, store the failure information in memory and provide the error information to a mechanic for fast and accurate repair.

Components and components location

Components

1. Fork cover
2. Clutch actuator & TCM assembly
3. Clutch actuator assembly

4. O-ring
5. DCT control module (TCM)

Schematic diagrams

Connector and Terminal Function

Pin	Description	Pin	Description
1	Ground 2 (Power)	14	Battery power 2 (Motor)
2	Ground 1 (Power)	15	Battery power 1 (Motor)
3	Shift lock solenoid	16	Battery voltage (Low Power)
4	Paddle shift "Up"	17	P-CAN 1 Low
5	Paddle shift "Down"	18	P-CAN 1 High
6	Inhibitor switch signal "R"	19	Local-DCT 1 Low
7	Inhibitor switch signal "N"	20	Local-DCT 1 High
8	Inhibitor switch signal "D"	21	Local-DCT 2 Low
9	Inhibitor switch signal "P"	22	Local-DCT 2 High
10	-	23	PT-Local 1 Low
11	Ignition voltage	24	PT-Local 1 High
12	Input speed sensor signal 2 (Even)	25	Input speed sensor signal 1 (Odd)
13	Input speed sensor power 2 (9 V)	26	Input speed sensor power 1 (9 V)

Repair procedures

Inspection

Transmission Control Module (TCM) Inspection Procedure

Inspecting TCM ground circuit: Measure the resistance between the TCM and chassis ground.

(Check the terminal connected to the chassis ground while using the back of the harness connector as the base point for TCM.)

Normal reading (resistance): Below 1Ω

2.	Inspecting the TCM connector: Disconnect the TCM connector and visually inspect to see whether there is a bend on the ground terminal of the harness connector. Also visually check the connection pressure.

3.	If no problem is found during inspection in step 1 and step 2, then the problem is with the TCM itself. In this case, replace the TCM and inspect the vehicle again.

4.	Re-inspecting TCM: Install the TCM that was determined to have malfunctioned from step 3 in another vehicle. Reset the error code and then check the operation in that vehicle. If the vehicle operates without any problems, then inspect the first vehicle with the initial problem again.

Removal

1.	Prior to replacing the TCM, check the TCM clutch compensation value with the diagnostic tool tool.

2.	Turn ignition switch OFF and disconnect the battery negative (-) terminal.

3.	Remove the clutch actuator assembly. (Refer to Dual Clutch Transmission Control System - "Clutch Actuator Assembly")

Loosen the bolts (A) and then removing the TCM (B).

Tightenning torque:

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

Installation

To install, reverse the removal procedure.

•	The existing O-rings (A) must be replaced with a new one. (Do not reuse it.)

2.	Perform the clutch compensation value setting procedure using the diagnostic tool after replacing TCM.

3.	Perform the clutch touch point learning procedure using the diagnostic tool after replacing TCM

❮Description and operation

DescriptionThe Dual Clutch Transmission (DCT) control system measures required data to identify the state of the control target and computes the appropriate compensation value if adjustment is necessary.

Clutch Actuator & TCM Assembly❯

Specifications Specification Item Specification Rated voltage12VRod length79.0 - 80.0 mm (3.1102 - 3.

Other information:

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