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:
Engine coolant temperature gauge
This gauge shows the temperature of the engine coolant when the ignition switch
is ON.
If the gauge pointer moves beyond the normal range area toward the “H” position,
it indicates overheating that may damage the engine.
Do not continue driving with an o ...
Description and operation
Description
The catalytic converter of the gasoline engine is a three way catalyst. It oxidizes
carbon monoxide and hydrocarbons (HC), and separates oxygen from the oxides of nitrogen
(NOx).
[WCC]
[UCC]
...
Automatic Transaxle Control System
Transaxle Oil Temperature Sensor