Hyundai Creta: 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
1.
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.
4.
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).

5.
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
1.
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
Adjustment Transaxle Control Module (TCM) Learning When shift shock is occurred or parts related with the transaxle are replaced, TCM learning should be performed. ...

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Other information:

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