Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Kia Forte LX, Automatic TransFACTORY OEM SERVICE PROCEDURE
TCM Terminal Input/Output Signal
Connector (CHG-A)
TCM CONNECTOR DESCRIPTION CHART
| Pin | Description | Condition | Input/output value | ||
|---|---|---|---|---|---|
| Type | Level | ||||
| 1 | - | ||||
| 2 | - | ||||
| 3 | Line pressure control solenoid valve (LINE_VFS) | Output | 0V/Battery voltage level | ||
| 9V < Battery voltage level < 16V | |||||
| 4 | Torque converter control solenoid valve (T/CON_VFS) | Output | 0V/Battery voltage level | ||
| 9V < Battery voltage level < 16V | |||||
| 5 | 35R clutch control solenoid valve (35R/C_VFS) | Output | 0V/Battery voltage level | ||
| 9V < Battery voltage level < 16V | |||||
| 6 | Input speed sensor power | ON | Power | 0V/7.5V | |
| OFF | |||||
| 7 | Output speed sensor power | ON | Power | 0V/7.5V | |
| OFF | |||||
| 8 | Input speed sensor signal | High | Input | 0.7V/1.4V | |
| Low | |||||
| 9 | Output speed sensor signal | High | Input | 0.7V/1.4V | |
| Low | |||||
| 10 | - | ||||
| 11 | - | ||||
| 12 | - | ||||
| 13 | - | ||||
| 14 | - | ||||
| 15 | - | ||||
| 16 | - | ||||
| 17 | Underdrive brake control solenoid valve | Output | 0V/Battery voltage level | ||
| (UD/B_VFS) | 9V < Battery voltage level < 16V | ||||
| Power supply : V_SOL2 | |||||
| 18 | 26 brake control solenoid valve | Output | 0V/Battery voltage level | ||
| (26/B_VFS) | 9V < Battery voltage level < 16V | ||||
| Power supply : V_SOL2 | |||||
| 19 | Shift lock solenoid | High | Output | 0V/Battery voltage level | |
| Low | 9V < Battery voltage level < 16V | ||||
| 20 | Overdrive clutch control solenoid valve | Output | 0V/Battery voltage level | ||
| (OD/C_VFS) | 9V < Battery voltage level < 16V | ||||
| Power supply : V_SOL1 | |||||
| 21 | - | ||||
| 22 | Rear lamp relay | R ON | Output | 0V/Battery voltage level | |
| Other | 9V < Battery voltage level < 16V | ||||
| 23 | - | ||||
| 24 | P/N relay | High | Output | 0V/Battery voltage level | |
| Low | 9V < Battery voltage level < 16V | ||||
| 25 | Inhibitor switch signal "S2" | High | Input | 0V/Battery voltage level | |
| Low | 9V < Battery voltage level < 16V | ||||
| 26 | Inhibitor switch signal "S3" | High | Input | 0V/Battery voltage level | |
| Low | 9V < Battery voltage level < 16V | ||||
| 27 | Inhibitor switch signal "S4" | High | Input | 0V/Battery voltage level | |
| Low | 9V < Battery voltage level < 16V | ||||
| 28 | - | ||||
| 29 | - | ||||
| 30 | - | ||||
| 31 | - | ||||
| 32 | ON/OFF solenoid valve B (SS-B) | High | Output | 0V/Battery voltage level | |
| Low | 9V < Battery voltage level < 16V | ||||
| 33 | ON/OFF solenoid valve A (SS-A) | High | Output | 0V/Battery voltage level | |
| Low | 9V < Battery voltage level < 16V | ||||
| 34 | Ground (Power 1) | Ground | 0V | ||
| 35 | Ground (Power 2) | Ground | 0V | ||
| 36 | Sports mode down switch | Down ON | Input | 0V/Battery voltage level | |
| Other | 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 | - | ||||
| 40 | Inhibitor switch signal "S1" | High | Input | 0V/Battery voltage level | |
| Low | 9V < Battery voltage level < 16V | ||||
| 41 | - | ||||
| 42 | - | ||||
| 43 | - | ||||
| 44 | - | ||||
| 45 | - | ||||
| 46 | - | ||||
| 47 | Solenoid supply power 1 | ON | Power | 0V/Battery voltage level | |
| OFF | 9V < Battery voltage level < 16V | ||||
| 48 | Solenoid supply power 2 | ON | Power | 0V/Battery voltage level | |
| OFF | 9V < Battery voltage level < 16V | ||||
| 49 | TCM Input power 1 | Power | Battery voltage level | ||
| (For solenoid) | 9V < Battery voltage level < 16V | ||||
| 50 | TCM Input power 2 | Power | Battery voltage level | ||
| (For solenoid) | 9V < Battery voltage level < 16V | ||||
| 51 | - | ||||
| 52 | - | ||||
| 53 | Oil temperature sensor (-) | Ground | 0V | ||
| 54 | Oil temperature sensor (+) | ON | Input | 0V/3.3V | |
| OFF | |||||
| 55 | - | ||||
| 56 | - | ||||
| 57 | - | ||||
| 58 | - | ||||
| 59 | - | ||||
| 60 | - | ||||
Connector (CHG-K)
TCM CONNECTOR DESCRIPTION CHART
| Pin | Description | Condition | Type | Level |
|---|---|---|---|---|
| 1 | Power ground | Ground | 0V | |
| 2 | Battery power (B+) | ON | Power | 0V/Battery voltage level |
| OFF | 9V < Battery voltage level < 16V | |||
| 3 | Power ground | Ground | 0V | |
| 4 | Battery power (B+) | ON | Power | 0V/Battery voltage level |
| OFF | 9V < Battery voltage level < 16V | |||
| 5 | Power ground | Ground | 0V | |
| 6 | Battery power (B+) | Power | Battery voltage level | |
| 9V < Battery voltage level < 16V | ||||
| 77 | CAN line (HIGH) | High | - | |
| Low | ||||
| 78 | CAN line (LOW) | High | ||
| Low |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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