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.
2009 Kia Rio Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Sensor And Actuator Function
SENSOR AND ACTUATOR FUNCTION
| Item | Functions |
|---|---|
| Input shaft speed sensor | Detect the turbine RPM at the E/C retainer |
| Output shaft speed sensor | Detect the T/F drive gear RPM at the transfer drive gear |
| Engine RPM signal | Receive the engine RPM via communication with ECU |
| Vehicle speed sensor | Detect the vehicle speed at the speedometer gear |
| Kickdown servo switch | Detect the operation starting of kickdown brake |
| Inhibitor switch | Detect the position of select lever through the contact switch |
| Overdrive switch | Detect the position of overdrive (4th gear) |
| TPS | Detect the throttle open angle through the potentiometer |
| Fluid temperature sensor | Detect the temperature of ATF through the thermistor |
| Torque reduction request signal | Transmit the torque reduction request signal to the engine ECU |
| Torque reduction operation/allowance/disallowance signal | Receive the signal of engine reduction pressure operation / allowance/disallowance from the ECU |
| Pressure control solenoid valve-A | Control the hydraulic pressure to the pressure control valve for shift control |
| Pressure control solenoid valve-B | Control the hydraulic pressure to the pressure control valve for shift control |
| Shifting control solenoid valve-A | Make the hydraulic passage for shift control |
| Shifting control solenoid valve-B | Make the hydraulic passage for shift control |
| Shifting control solenoid valve-C | Make the hydraulic passage for shift control |
| Damper clutch control solenoid valve | Control the hydraulic pressure for the damper clutch control |
| * E/C: End Clutch T/F: Transfer |
|
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.