Hyundai Accent (HC): 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")

Other information:

Hyundai Accent (HC) (2017 - 2022) Service Manual: Troubleshooting

- Basic Troubleshooting Basic Troubleshooting Guide Customer Problem Analysis Sheet Basic Inspection Procedure Measuring Condition Of Electronic Parts' Resistance The measured resistance at high temperature after vehicle running may be high or low. So all resistance must be measured at ambient temperature (20°C, 68°F), unless stated otherwise.

Hyundai Accent (HC) (2017 - 2022) Service Manual: Heater & A/C Control Unit (FATC)

- Components ConnectorPin NOFunctionConnectorPin NOFunction A1Battery (+)A21IGN2 2ADS Sensor (PWM)22IGN1 3ILL+ (TAIL)23HTD (Rear defog indicator) 4C_CAN High24PAB off signal 5C_CAN Low25PAB IGN1 6Defrost actuator (Open)26Sensor ground REF (+5V) 7Defrost actuator (Close)27Detent out (-) 8Mode control actuator (Vent)28Ambient Temperature Sensor (+) 9Mode control actuator (Def)29Evaporator Temperature Sensor (+) 10Temperature control actuator (Cool)30Photo sensor (-) 11Temperature control actuator (Warm)31- 12Intake actuator (Fresh)32- 13Intake actuator (Recirculation)33Hazard signal 14Mode control actuator (Feedback)34Rear defog swich 15Tmperature control actuator (Feedback)35- 16Intake actuator (Feedback)36Blower motor (+) 17Defrost actuator (Feedback)37Fet (Drain feedback) 18ECV+38Fet (Gate) 19ECV- (Ground)39Sensor ground 20ILL- (RHEO)40Ground - Self Diagnosis 1.

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