Throttle Position Sensor 1 Performance

The throttle position sensor (TPS) tells the engine computer how far the throttle is open. If it doesn't match what the computer expects based on pedal position, you'll get this code.

The engine control module (ECM) looks for a voltage output from the TPS between 0.5V (closed throttle) and 4.5V (wide open throttle). It expects a linear response as the throttle plate opens. If the voltage deviates from this expected range or doesn't change smoothly, it triggers the code.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Inspect the wiring and connectors to the throttle position sensor for corrosion or damage. Correct as needed. Decision point: If damaged, repair and recheck code.
2. 22. Use a multimeter to test the TPS output voltage while manually moving the throttle plate. Expected range is 0.5V to 4.5V. Decision point: If outside range, replace the throttle position sensor.
3. 33. If the TPS checks out, check for any binding in the throttle body shaft. Clean and lubricate if necessary. Decision point: If still binding after cleaning, replace the throttle body.
4. 44. Finally, check for any software updates for the ECM that may address this issue.

• Faulty throttle position sensor
• Wiring issues (shorts or opens)
• Bad connector terminal
• Throttle body mechanical problems
• Software issues in the engine control module

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