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.
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HOMESERVICE MANUALSHYUNDAI1999ELANTRA WAGON L4-2.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORDESCRIPTION AND OPERATION
1999 Hyundai Elantra Wagon L4-2.0L
Throttle Position Sensor: Description and Operation
1999 Hyundai Elantra Wagon L4-2.0LSECTION Description and Operation
THROTTLE POSITION (TP) SENSOR
The Throttle Position (TP) sensor mounts on the side of the throttle body and is connected to the throttle blade shaft.
The TP sensor is a variable resistor (potentiometer) whose resistance changes according to throttle blade shaft position. During acceleration, the TP sensor resistance decreases; during deceleration, the TP sensor resistance increases.
The Engine Control Module (ECM) applies a reference voltage to the TP sensor and then measures the voltage that is present on the TP sensor signal circuit. The ECM uses the TP sensor signal to adjust timing and injector pulse width. The TP sensor signal along with the MAF sensor signal is used by the ECM to calculate engine load.
The TP Sensor is a rotating type variable resistor that rotates with the throttle shaft to sensor the throttle valve angle. As the throttle shaft rotates, the throttle angle of the TP Sensor changes and the ECM detects the throttle valve opening based on the change of the throttle angle.
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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.