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.
2008 Kia Optima EX, 2.4 3FACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor (TPS)
- Start engine and connect the scan tool to data link connector.
- Inspect TPS signal output with the scan tool on condition as shown below.
Specification:
[TPS #1]
Idle: 0.25-0.9V
Wide open throttle: Min. 4.0V
[TPS #2]
Idle: Min. 4.0V
Wide open throttle: 0.25-0.9V
- Stop engine and disconnect throttle body assembly connector.
- Measure resistance as shown below.
Specification: Between pin 1 and 2: 0.88-1.63 kΞ©
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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.