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

Hyundai Palisade (LX2) 2020-2024 Service Manual / Automatic Transaxle System (A8LF1) / Automatic Transaxle Control System / Transaxle Control Module (TCM)

Components and components location
Components Location

Hyundai Palisade. Components and components location

1. 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.

Hyundai Palisade. Description and operation
Schematic diagrams
TCM Connector

Hyundai Palisade. Schematic diagrams

TCM terminal function
Pin
Description
Pin
Description
1
 UD Clutch control solenoid valve (UD/C_VFS)
 34
 Input speed sensor signal
2
 46 Clutch control solenoid valve (46/C_VFS)
 43
 CAN High
3
 Line pressure control solenoid valve (LINE_VFS)
 52
 CAN Low
5
 Torque converter control solenoid valve (T/CON_VFS)
 56
 Output speed sensor power
7
 28 Brake control solenoid valve (28/B_VFS)
 57
 Middle speed sensor power
8
 37R Clutch control solenoid valve (37R/C_VFS)
 58
 Input speed sensor power
9
 OD Clutch & LR Brake Clutch control solenoid valve (OD/C & LR/B_VFS)
 65
 Solenoid valve power 1 (2, 5, 7, 8)
17
 IG.1
 66
 Solenoid valve power 2 (1, 3, 9, 27)
25
 Oil temperature sensor (+)
 67
 Power
26
 Oil temperature sensor (-)
 68
 Power
27
 SS-A solenoid valve (SS-A_ON/OFF)
 71
 Ground
31
 Middle speed sensor signal
 73
 Ground
32
 Output speed sensor signal
 74
 Ground

TCM terminal input / output signal
Pin
Description
Condition
Input / output value
Type
Level
1
 UD Clutch control solenoid valve
(UD/C_VFS)
 -
 Output
 0V/Battery voltage level
9V < Battery voltage level < 16V
2
 46 Clutch control solenoid valve
(46/C_VFS)
 -
 Output
 0V/Battery voltage level
9V < Battery voltage level < 16V
3
 Line pressure control solenoid valve
(LINE_VFS)
 -
 Output
 0V/Battery voltage level
9V < Battery voltage level < 16V
5
 Torque converter control solenoid valve (T/CON_VFS)
 -
 Output
 0V/Battery voltage level
9V < Battery voltage level < 16V
7
 28 Brake control solenoid valve
(28/B_VFS)
 -
 Output
 0V/Battery voltage level
9V < Battery voltage level < 16V
8
 37R Clutch control solenoid valve
(37R/C_VFS)
 -
 Output
 0V/Battery voltage level
9V < Battery voltage level < 16V
9
  OD Clutch & LR Brake Clutch control solenoid valve (OD/C & LR/B_VFS)
 -
 Output
 0V/Battery voltage level
9V < Battery voltage level < 16V
17
 IG.1
 On
 Power
 0V/Battery voltage level
Off
 9V < Battery voltage level < 16V
25
 Oil temperature sensor (+)
 ON
 Input
 0V/5V
OFF
26
 Oil temperature sensor (-)
 -
 Ground
 0V
27
 SS-A solenoid valve (SS-A_ON/OFF)
 High
 Output
 0V/Battery voltage level
Low
 9V < Battery voltage level < 16V
31
 Middle speed sensor signal
 High
 Input
 0.7V/1.4V
Low
32
 Output speed sensor signal
 High
 Input
 0.7V/1.4V
Low
34
 Input speed sensor signal
 High
 Input
 0.7V/1.4V
Low
56
 Output speed sensor power
 ON
 Power
 0V/9V
OFF
57
 Middle speed sensor power
 On
 Power
 0V/9V
Off
58
 Input speed sensor power
 On
 Power
 0V/9V
Off
65
 Solenoid valve power 1
 -
 Power
 0V/Battery voltage level
9V < Battery voltage level < 16V
66
 Solenoid valve power 2
 -
 Power
 0V/Battery voltage level
9V < Battery voltage level < 16V
67
 Power
 On
 Power
 0V/Battery voltage level
Off
 9V < Battery voltage level < 16V
68
 Power
 On
 Power
 0V/Battery voltage level
Off
 9V < Battery voltage level < 16V
71
 Ground
 -
 Ground
 0V
73
 Ground
 -
 Ground
 0V
74
 Ground
 -
 Ground
 0V

Repair procedures
Inspection
1.
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 diagnostic tool when replacing with a new TCM.

Hyundai Palisade. Repair procedures
2.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
3.
Remove the glove box.
(Refer to Body (Interior and Exterior) - "Glove Box")
4.
Remove the integrated body control unit (IBU).
(Refer to Body Electical System - "Integrated Body Control Unit (IBU)")
5.
Remove the intergrated control module (ICM) relay box.
(Refer to Body Electrical System - "Fuse and Relay")
6.
Remove the TCM
1)
Disconect the TCM connector (A).

Hyundai Palisade. Repair procedures
2)
Remove the TCM (D) after loosening the mounting nuts (B) and then bolts (C).

Hyundai Palisade. Repair procedures
3)
Remove the TCM (F) after loosening the nuts (E) from the bracket.

Hyundai Palisade. Repair procedures
Installation
1.
To install, reverse the removal procedure.
2.
Perform the oil pressure characteristics input procedure using the diagnostic tool when replacing with a new TCM.

Hyundai Palisade. Repair procedures
3.
In order to avoid any problem including sense of starting delay of the transaxle and shock at acceleration and vehicle start, make sure to process learning for TCM after replacing the transaxle / TCM.
(Refer to Automatic Transaxle Control System - "Repair Procedures")

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