Openthe throttle plate a little at a time while keeping an eye on how the multimeter's readings change. As you open the throttle, your multimeter should show an increasing value over time. The multimeter should also show 5 volts (or 3.5 volts in some TPS models) when the plate is fully open. Luckily the TPS sensor is in a rather convenient location to change on most vehicles, right on the side of the throttle body. The throttle position sensor cost ranges from around $40 and up, depending on your car. Find the right fit for your needs at AutoZone. Filter by year, make, model, and engine size to see TPS sensors and other automotive Thistest is done with the engine off but with the ignition in the on position. Once the ground and signal wires are identified measure the voltage output with the meter as the throttle is moved. On most engines the output will vary from about 1 to 5 volts. Look to see if the output changes smoothly as the throttle is adjusted up and down. ECMSensor. The engine control module (ECM) is also known as the powertrain control module (PCM) or the engine control unit (ECU). The main responsibility of this controller is to get information from sensors and run certain actuators. In the case of any errors, the ECU shows a check engine light on your dashboard. Symptomsof bad throttle valve position sensor in your car.BGM Credits:Music from #inaudio: Thefirst "official" video in the "Understanding and Diagnosis" series as recommended by you, the viewer. In this series we cover the TPS and any future rep 5 Engine Power Is Insufficient. Among the throttle position sensor symptoms is a loss of engine power in your vehicle. Because if your throttle position sensor fails, your car will go into a safe mode, limiting heavy acceleration and speed and resulting in a loss of engine power. 6. Connectthe negitive probe to a good engine ground. Turn the key on but do not start the engine. The voltage should be 0.6 volts at closed throttle. Open the throttle slowly and smoothley. The voltage should increase smoothley to 4.5 volts at wide open throttle. Your maf sensor needs to be hooked up to a scan tool to test. Issue Throttle Position Sensor Reset? As your truck ages, the throttle response may slowly dwindle. Some forum users are using a clever method to reset their Throttle Position Sensor (TPS) and get more throttle response. Read the full discussion below to find out how: Novem by Jason. If your Chevy Silverado has a faulty throttle body, it can cause it to run terribly. Common symptoms of a bad throttle body include dirt and grime, the check engine light, and an erratic idle. Your Silverado's throttle body controls the amount of air that enters the engine. You control the throttle body position lw3ML.