Throttle Position Sensor - Voltage Above Normal

The throttle position sensor measures how far open the throttle is; if it's reading too high, the engine thinks it's getting more air than it actually is, which can cause performance issues.

The ECU sees a voltage from the TPS that exceeds the expected range, usually above 4.5 volts when it should be between 0.5 to 4.5 volts during normal operation.

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 wiring and connectors for damage, corrosion, or loose connections. Decision: If issues found, repair and retest. If no issues, proceed to step 2.
2. 22. Check throttle position sensor voltage signal at the ECU with a multimeter. Expected value is between 0.5V and 4.5V. Decision: If voltage is above 4.5V, replace the throttle position sensor. If voltage is in range, proceed to step 3.
3. 33. Check for mechanical binding in the throttle mechanism. Ensure it moves freely. Decision: If binding found, repair it. If not, further diagnosis of the ECU is needed.

• Wiring issues (short to power)
• Faulty throttle position sensor
• ECU fault
• Mechanical binding in the throttle linkage

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