Throttle Position Sensor Intermittent Circuit

The throttle position sensor reads how far the accelerator pedal is pressed, but it sometimes sends an incorrect signal to the engine computer. Imagine it as a bad link in a chain; sometimes the computer can't tell how much gas you're asking for.

The engine control module (ECM) expects a smooth voltage signal from the throttle position sensor (TPS). If it fluctuates or drops out, it triggers this code. It normally sees voltages from about 0.5V (closed throttle) to 4.5V (full throttle).

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. 1Check the wiring and connectors to the throttle position sensor for signs of damage or corrosion before anything else. Look for tight connections and no broken wires.
2. 2With the key on, check the voltage at the TPS connector. You should get between 0.5V (closed) and 4.5V (wide open). If not, repair the wiring or replace the connector.
3. 3Start the engine and observe the TPS signal with a scan tool. It should rise smoothly with accelerator pedal movement. If it drops out intermittently, replace the TPS.
4. 4If the TPS is working fine, check for vacuum leaks around the throttle body that could cause erratic readings. Fix any leaks if found.

• Faulty throttle position sensor
• Bad wiring or connectors (frayed, corroded)
• ECM issue
• Intermittent vacuum leaks affecting throttle response
• Mechanical binding in throttle body

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