Engine-Codes - Kia - P1121 KIA

P1121 KIA - Throttle Position Sensor Signal Invalid

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1121 KIA Possible Causes

  • Faulty Throttle Position Sensor
  • Throttle Position Sensor harness is open or shorted
  • Throttle Position Sensor circuit poor electrical connection

How is the P1121 KIA code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P1121 KIA code

Labor: 1.0

The cost to diagnose the P1121 KIA code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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When is the code detected?

If the difference between actual and calculated value exceeds threshold value, the ECM judged this as a fault and DTC is set.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1121 KIA Meaning

Throttle Position (TP) Sensor measures the opening angle of throttle valve and mounts on the side of the throttle body and is connected to the throttle blade shaft. The TP sensor’s resistance changes according to the throttle blade shaft position. TP Sensor has a potentiometer whose resistance changes along with the Throttle valve position. The Engine Control Module (ECM) provides a 5volt reference voltage to the TP Sensor. The ECM reads the voltage across the TP Sensor and converts it into throttle position. During acceleration, the TP Sensor resistance decreases. During deceleration, the TP Sensor resistance increases. 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. Throttle angle information to the ECM to be used for the detection of engine status such as idle, part load, full throttle condition and anti-jerk condition and acceleration fuel enrichment correction.

More Information

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