To test a throttle position sensor (TPS), measure the voltage on the signal return wire with the vehicle in key on, engine off (KOEO) mode. The voltage should be close to 5V with the throttle closed and gradually drop towards 0V at wide open throttle.

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The voltage on the signal wire of a TPS typically starts low (around 0.5V) with the throttle closed and increases towards 5V as the throttle opens.

To Test a Throttle Position Sensor (TPS), Measure the Voltage