Hyundai Creta: Automatic Transaxle Control System / Transaxle Control Module (TCM)

Hyundai Creta GS 2014-2025 Service Manual / Automatic Transaxle System / Automatic Transaxle Control System / Transaxle Control Module (TCM)

Description and operation

Description

•	Monitoring the vehicle's operating conditions to determine the optimal gear setting.

•	Performing a gear change if the current gear setting differs from the identified optimal gear setting.

•	Determining the need for damper clutch (D/C) activation and engages the clutch accordingly.

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

•	Diagnosing the automatic transaxle for faults and failures.

Schematic diagrams

1. TCM Connector and Terminal Function

2. TCM Terminal Function

Connector [A]

Pin	Description	Pin	Description
22	Overdrive clutch control solenoid valve (OD/C_VFS)	73	Inhibitor switch signal "S4"
23	Pressure control solenoid (VFS-LINE)	74	Inhibitor switch signal "S2"
26	ON/OFF solenoid valve B (SS-B)	75	Inhibitor switch signal "S3"
37	Sports mode up switch	87	Solenoid power 1
38	Sports mode select switch	88	Solenoid power 2
39	Oil temperature sensor (-)	89	ON/OFF solenoid valve A (SS-A)
43	Underdrive brake control solenoid valve (UD/B_VFS)	94	Inhibitor switch signal "S1"
44	35R clutch control solenoid valve (35R/C_VFS)	95	Output speed sensor power
45	Torque converter control solenoid (T/CON_VFS)	96	Input speed sensor power
46	26 brake control solenoid valve (26/B_VFS)	99	Input speed sensor signal
58	Sports mode down switch	100	Output speed sensor signal
59	Oil temperature sensor (+)

Connector [B]

Pin	Description	Pin	Description
1	GND (Power)	5	VB (Battery voltage)
2	GND (Power)	60	CAN High
3	VB (Battery voltage)	68	IG.1 ( Ignition key)
4	Ground (Power)	77	CAN Low

TCM Terminal input/ output signal

Connector [A]

Pin	Description	Condition	Input/output value
			Type	Level
22	Overdrive clutch control solenoid valve (OD/C_VFS)	-	Output	0V / Battery voltage level
				9V < Battery voltage level < 16V
23	Line pressure control solenoid valve (LINE_VFS)	-	Output	0V / Battery voltage level
				9V < Battery voltage level < 16V
26	ON/OFF solenoid valve B (SS-B)	High	Output	0V / Battery voltage level
		Low		9V < Battery voltage level < 16V
37	Sports mode up switch	Up ON	Input	0V / Battery voltage level
		Other		9V < Battery voltage level < 16V
38	Sports mode select switch	Sport mode	Input	0V / Battery voltage level
		Other		9V < Battery voltage level < 16V
39	Oil temperature sensor (+)	ON	Input	0V / 3.3V
		OFF
43	Underdrive brake control solenoid valve (UD/B_VFS)	-	Output	0V / Battery voltage level
				9V < Battery voltage level < 16V
				Power supply : V_SOL2
44	35R clutch control solenoid valve (35R/C_VFS)	-	Output	0V / Battery voltage level
				9V < Battery voltage level < 16V
45	Torque converter control solenoid valve (T/CON_VFS)	-	Output	0V / Battery voltage level
				9V < Battery voltage level < 16V
46	26 brake control solenoid valve (26/B_VFS)	-	Output	0V / Battery voltage level
				9V < Battery voltage level < 16V
				Power supply : V_SOL2
58	Sports mode down switch	Down ON	Input	0V / Battery voltage level
		Other		9V < Battery voltage level < 16V
59	Oil temperature sensor (-)	-	Ground	0V
73	Inhibitor switch signal "S4"	High	Input	0V / Battery voltage level
		Low		9V < Battery voltage level < 16V
74	Inhibitor switch signal "S2"	High	Input	0V / Battery voltage level
		Low		9V < Battery voltage level < 16V
75	Inhibitor switch signal "S3"	High	Input	0V / Battery voltage level
		Low		9V < Battery voltage level < 16V
89	ON/OFF solenoid valve A (SS-A)	High	Output	0V / Battery voltage level
		Low		9V < Battery voltage level < 16V
94	Inhibitor switch signal "S1"	High	Input	0V / Battery voltage level
		Low		9V < Battery voltage level < 16V
95	Output speed sensor power	ON	Power	0V / 7.5V
		OFF
96	Input speed sensor power	ON	Power	0V / 7.5V
		OFF
99	Input speed sensor signal	High	Input	0.7V / 1.4V
		Low
100	Output speed sensor signal	High	Input	0.7V / 1.4V
		Low

Circuit Diagram

Repair procedures

Inspection

Transaxle Control Module (TCM) Problem Inspection Procedure

TEST TCM GROUND CIRCUIT: Measure resistance between TCM and chassis ground using the backside of TCM harness connector as TCM side check point. If the problem is found, repair it.

Specification: Below 1 Ω

2.	TEST TCM CONNECTOR: Disconnect the TCM connector and visually check the ground terminals on TCM side and harness side for bent pins or poor contact pressure. If the problem is found, repair it.

3.	If problem is not found in Step 1 and 2, the TCM could be faulty. If so, make sure there were no DTC's before swapping the TCM with a new one, and then check the vehicle again. If DTC's were found, examine this first before swapping TCM.

RE-TEST THE ORIGINAL TCM: Install the original TCM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original TCM with a new one. If problem does not occur, this is intermittent problem (Refer to “Intermittent Problem Inspection Procedure” in Basic Inspection Procedure).

Removal

1.	Turn ignition switch OFF.

2.	Disconnect the negative (-) battery cable.

3.	Remove the battery.

4.	Disconnect the TCM connector (A).

Remove the TCM (A) after removing the bolt and nut.

TCM installation bolt/nut:

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

Installation

Install in the reverse order of removal.

•	Perform the procedures related in the ECM after replacing the TCM. (Refer to Engine Control / Fuel System - "Engine Control Module")

•	Perform the TCM adaptive values learning procedure. (Refer to Automatic Transaxle Control System - "Repair procedures")

Repair procedures

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