Hyundai Tucson Quiz
AUTOMATIC TRANSMISSION SYSTEM

Transmission Control Module (TCM)

In this manual: AUTOMATIC TRANSMISSION SYSTEM
General Information — 17Engine Mechanical System — 51Engine Electrical System — 26Emission Control System — 23Engine/Fuel Control System — 44Clutch System — 12MANUAL TRANSMISSION SYSTEM — 12AUTOMATIC TRANSMISSION SYSTEM — 42Four-Wheel Drive (4WD) System — 14Drive Shaft and Axle — 22Suspension System — 30Steering System — 16Restraint — 21Braking System — 47Body Work (Interior and Exterior) — 145Body Electrical System — 162Heating, Ventilation and Air Conditioning — 39
14steps
~84min
3/5difficulty
0102030405011.89N·mlb·ft
Tightening torque found on this page
Done 0 of 14

Description and Operation

Description

  • Monitors the vehicle operating conditions to determine the optimal shift speed setting.
  • Performs gear shifting when the current gear setting differs from the determined optimal shift speed setting.
  • Determines whether to engage the damper clutch (D/C) and engages the clutch accordingly.
  • Calculates the optimal line pressure level by constantly monitoring the torque level and adjusting the pressure accordingly.
  • Automatic Transaxle Troubleshooting and Failure Diagnosis.

Circuit 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 (SS-B) 75 Inhibitor Switch Signal (S3)
37 High Sport Mode Switch 87 Solenoid Power 1
38 Sport Mode Select Switch 88 Solenoid Power 2
39 Transmission Fluid Temperature Sensor (+) 89 On/Off Solenoid Valve A (SS-A)
43 Low Speed Brake Control Solenoid Valve
(LR/B_VFS)		 94 Inhibitor Switch Signal (S1)
44 35R Clutch Control Solenoid Valve (35R/C_VFS) 95 Speed Sensor Output 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 Low Sport Mode Switch 100 Output Speed Sensor Signal
59 Transmission Fluid Temperature Sensor (+)

Connector "B"
Pin Description Pin Description
1 GROUND (POWER) 5 VB (Battery Voltage)
2 GROUND (POWER) 60 CAN High
3 VB (Battery Voltage) 68 IGN.1 (Ignition Switch)
4 GROUND (POWER) 77 CAN Low

TCM Terminal Signal Input/Output

CONNECTOR [A]
Pin Description Condition INPUT/OUTPUT VALUE
Good Level
22 Overdrive Clutch Control Solenoid Valve
(OD/C_VFS)		 - Output Battery Voltage Level/0 V
9 V < Battery Voltage Level < 16 V
23 Line Pressure Control Solenoid Valve
(LINE_VFS)		 - Output Battery Voltage Level/0 V
9 V < Battery Voltage Level < 16 V
26 On/Off Solenoid Valve (SS-B) High Output Battery Voltage Level/0 V
Down 9 V < Battery Voltage Level < 16 V
37 High Sport Mode Switch HIGH ON Input Battery Voltage Level/0 V
Other 9 V < Battery Voltage Level < 16 V
38 Sport Mode Select Switch sport mode Input Battery Voltage Level/0 V
Other 9 V < Battery Voltage Level < 16 V
39 Transmission Fluid Temperature Sensor (+) WE Input 0 V/3.3 V
OFF
43 Low Speed Brake Control Solenoid Valve
(LR/B_VFS)		 - Output Battery Voltage Level/0 V
9 V < Battery Voltage Level < 16 V
Power Supply: V_SOL2
44 35R Clutch Control Solenoid Valve
(35R/C_VFS)		 - Output Battery Voltage Level/0 V
9 V < Battery Voltage Level < 16 V
45 Torque Converter Control Solenoid Valve
(T/C_VFS)		 - Output Battery Voltage Level/0 V
9 V < Battery Voltage Level < 16 V
46 26 Brake Control Solenoid Valve
(26/B_VFS)		 - Output Battery Voltage Level/0 V
9 V < Battery Voltage Level < 16 V
Power Supply: V_SOL2
58 Low Sport Mode Switch LOW ON Input Battery Voltage Level/0 V
Other 9 V < Battery Voltage Level < 16 V
59 Transmission Fluid Temperature Sensor (+) - Ground 0 V
73 Inhibitor Switch Signal (S4) High Input Battery Voltage Level/0 V
Down 9 V < Battery Voltage Level < 16 V
74 Inhibitor Switch Signal (S2) High Input Battery Voltage Level/0 V
Down 9 V < Battery Voltage Level < 16 V
75 Inhibitor Switch Signal (S3) High Input Battery Voltage Level/0 V
Down 9 V < Battery Voltage Level < 16 V
89 On/Off Solenoid Valve A (SS-A) High Output Battery Voltage Level/0 V
Down 9 V < Battery Voltage Level < 16 V
94 Inhibitor Switch Signal (S1) High Input Battery Voltage Level/0 V
Down 9 V < Battery Voltage Level < 16 V
95 Speed Sensor Output Power WE Output 0 V/7.5 V
OFF
96 Input Speed Sensor Power WE Output 0 V/7.5 V
OFF
99 Input Speed Sensor Signal High Input 0.7 V/1.4 V
Down
100 Output Speed Sensor Signal High Input 0.7 V/1.4 V
Down

Wiring Diagram

Repair Procedures

Inspection

Transmission Control Module (TCM) Problem Inspection Procedure
  1. TCM GROUND CIRCUIT TEST: Measure the resistance between the TCM and chassis ground using the rear of the TCM wiring harness connector as a checkpoint on the TCM side. Repair any problem if possible.

    Specification: Below 1 Ω

  2. TCM CONNECTOR INSPECTION: Disconnect the TCM connector and perform a visual inspection of the ground terminals on the TCM side and the harness side to make sure there are no bent pins or poor contact pressure. Repair any problem if possible.
  3. If no problem is found in steps 1 and 2, the TCM may be faulty. If so, make sure there are no DTCs before replacing the TCM with a new one, then recheck the vehicle. If any DTCs are present, check them before replacing the TCM.
  4. ORIGINAL TCM SUBSTITUTION TEST: Install the original TCM (known good) on a verified vehicle and check the vehicle. If the problem reappears, replace the original TCM with a new one. If the problem does not appear, the problem is intermittent (refer to "Intermittent Problem Procedure" in "Basic Inspection Procedure").

DEPOSIT

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the negative (-) battery cable.
  3. Remove the air filter and air duct. (Refer to Engine Mechanical System - "Air Filter")
  4. Disconnect the TCM connector (A).
  5. Disconnect the TCM connector (B).
  6. Remove the retaining bracket (A) from the wiring harness.
  7. Remove the TCM (A) by removing the mounting nuts and bolt (B).

    TCM Mounting Nut: 9.8 - 11.8 N·m

REMEDY

  1. To install, perform the removal procedure in reverse order.
  2. Perform the ECM-related procedures after replacing the TCM. (Refer to Fuel System/Engine Control - "Engine Control Module")
  3. Perform TCM learning after replacing the transaxle to avoid sluggish shifting, acceleration, and harsh starts. (Refer to Automatic Transaxle Control System - "Repair Procedures")

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