Kia Rio: Automatic Transaxle Control System / Transaxle Control Module (TCM)
Description and operation
The module receives and processes signals from various sensors and implements
a wide range of transaxle 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 automatic transaxle.
|
Schematic diagrams
Connector [A]
Pin
|
Description
|
3
|
PCSV-D
|
4
|
PCSV-A
|
5
|
LINE_VFS
|
24
|
PCSV-B
|
43
|
PCSV-C
|
45
|
SCSV-A
|
54
|
Manual mode "select" switch
|
57
|
Inhibitor switch "D" input
|
58
|
Inhibitor switch "R" input
|
62
|
Manual mode "up" switch
|
64
|
Power
|
68
|
Ground
|
79
|
Oil temperature sensor (-)
|
80
|
Oil temperature sensor (+)
|
84
|
Inhibitor switch "P" input
|
85
|
Power
|
87
|
Ground
|
88
|
Ground
|
99
|
Output speed sensor (+) signal
|
100
|
Input speed sensor (+) signal
|
104
|
Inhibitor switch "N" input
|
105
|
Manual mode "down" switch
|
Connector [K]
Pin
|
Description
|
5
|
Engine control relay "ON" input
|
43
|
Output speed sensor ground
|
82
|
Input speed sensor ground
|
Repair procedures
| 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.)
|
| 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 intermittentproblem and other
part may be faulty.
|
| 1. |
Remove the battery.
(Refer to Engine Electrical System - "Battery")
|
| 2. |
Disconnect the TCM connectors (A) and then remove the TCM after loosening
the bolts and nut.
|
Tightening torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)
|
|
| 1. |
Install in the reverse order of removal.
|
| • |
Perform the TCM adaptive values learning procedure after replacing
the TCM.
|
| • |
After replacing the TCM, perform the ECM-related procedures.
(Refer to Engine Control / Fuel System - "Engine Control Module")
|
|
Description and operation
Description
Automatic transaxle control system relies on various measurements to determine
the current control status and determine the necessary compensation ...
Specifications
Specification
Item
Specification
Type
*NTC thermistor
Temp.[(°C)°F] / Resistance (kΩ)
...
Other information:
Repair procedures
Replacement
Put on gloves to protect your hands.
•
Use a plastic panel removal tool to remov ...
Specifications
Specification
Item
Specification
Coil resistance (Ω)
30.0 - 35.0 [20°C(68°F)]
Pin
2
Description and operation
Description
Engine coolant stop solenoid valv ...
Automatic Transaxle Control System
Transaxle Oil Temperature Sensor