Hyundai Accent (HC): IVT Control System / Transmission Control Module (TCM)

Hyundai Accent (HC) (2017 - 2022) Service Manual / Intelligent Variable Transmission (IVT) System (Continuously Variable Transmission) / IVT Control System / Transmission Control Module (TCM)

- Components

1. Transmission control module (TCM)


- Description The module receives and processes signals from various sensors and implements a wide range of transmission 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 Intelligent Variable Transmission (IVT) .

- Operation

- TCM Connector

TCM Terminal Function
Connector [A]Connector [B]
PinDescriptionPinDescription
A5Driven (Secondary) speed sensor signalB1Ground
A6Turbine speed sensor signalB2Ground
A24Line pressure control solenoid valve (Line_VFS)B3Battery power
A26Drive (Primary) speed sensor signal B4Ground
A27Oil temperature (+)B26IGN.
A29Position sensor (Ground) B45CAN (Low)
A32Pressures sensor (Signal)B60Battery
A43Drive/reverse clutch control solenoid valve (Clutch/Brake_VFS)B62CAN (High)
A44Damper clutch control solenoid valve (Damper/C_VFS)
A45Drive pulley control solenoid valve (Primary_VFS)
A46Turbine speed sensor (Power)
A47Position sensor (Power)
A48Position sensor (S1)
A49Oil temperature (-)
A55Sports mode down switch
A57Sports mode up switch
A65Driven pulley control solenoid valve (Secondary_VFS)
A68Pressures swnsor (Power)
A69Driven (Secondary) speed sensor supply (Power)
A74Driven (Secondary) pressures sensor signal
A76Drive (Primary) speed sensor supply(Power)
A85Solenoid valve 1 (Power)
A86Solenoid valve 2 (Power)
A93Position sensor (S2)
A98Sports mode select switch

- Inspection

1.Transmisson Control Module (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 intermittent problem and other part may be faulty.

- Removal

1.Perform the oil pressure characteristics backup procedure using the diagnotic tool when replacing with a new TCM.

2.Remove the battery.(Refer to Body Electrical System - "Battery")

3.Disconnect the TCM connectors (A).

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

4.Remove the bolts (A) and nut (B)

5.Remove the TCM (C).

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

6.Loosen the mounting nuts and then removing the TCM (A) from the bracket.

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

- Installation

1.To install reverse the removal procedures.

2.Perform the oil pressure characteristics input procedure using the diagnotic tool when replacing with a new TCM.

3.Perform the ECM-related procedures. (Refer to Engine Control / Fuel System - "Engine Control Module")

IVT Control System

E-Module

Other information:

Hyundai Accent (HC) (2017 - 2022) Service Manual: Clutch Switch

- Specifications ItemSpecifications Working voltageDC 12.5V ± 0.3V Operating forceInitial position : 0.25 ± 0.15N(0.025 ± 0.015kg, 0.056 ± 0.034lb) Full position : 0.8 ± 0.2 N(0.08 ± 0.02 kgf, 0.579 ± 0.014 lb-ft) Working temperature-40℃ ~ 80℃ (-40℉ ~ 176℉) - Description – Clutch operation is detected through clutch switch signal.

Hyundai Accent (HC) (2017 - 2022) Service Manual: Mode Control Actuator

- Components Location 1. Mode control actuator - Description The mode control actuator is located at the heater unit.It adjusts the position of the mode door by operating the mode control actuator based on the signal of the A/C control unit. Pressing the mode select switch makes the mode control actuator shift in order of Vent → Bi-Level → Floor → Mix.

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