Asthe throttle is closing, you should see the voltage decrease smoothly and without any gaps or skips, to the exact same voltage you noticed in step 5. Part 3. 9. Lightly tap on the throttle position sensor with the handle of a screw-driver as you slowly open and close the throttle and observe the multimeter.

Thesensors are often quite expensive, and can be difficult to reach and replace; they often rust and get stuck. 15. Boost pressure sensor. The boost pressure sensor measures the boost pressure in the intake boost pipes. You will only have this sensor if your car is equipped with a turbo or supercharger.

IssuesWith the Main Relay. Symptoms of a bad main relay include: You will have no-start issues. A lack of sound in the fuel pump when engine starts. Overheating that will prevent the car from starting in high temperatures. Disconnect the battery and replace the main relay using a ratchet or wrench. Thethrottle body controls the amount of air the engine takes in, and when it gets dirty, the engine can't idle smoothly. As the vapors bake from the engine heat, they form black sooty carbon deposits inside the throttle body. Here are the most common signs a failing throttle body we've seen in our shop: 1. Grime buildup. Troublecode P0121 is signaled when your powertrain control module receives an incorrect signal from your throttle position sensor, or TPS. Your TPS is connected to a reference wire with five volts and typically a ground wire. It communicates the position of your throttle with your powertrain control module, which uses your RPMs to check the Diagnosinga faulty TPS sensor. In order to diagnose a faulty TPS sensor, you'll need to use an OBD-II scanner or other diagnostic tool. This tool will allow you to check the voltage readings coming from the TPS sensor, as well as whether the sensor is responding correctly to changes in the throttle position. If any of these readings are out of SymptomsOf A Bad Throttle Position Sensor. The throttle position sensor's job is to tell the PCM how much the throttle plate opens/closes as you step on/off the accelerator. The PCM then uses this info to calculate fuel injection, advance/retard ignition timing, etc. So when the TPS fails, your 4.7L Dodge engine is gonna' resent it.
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Thepresence of any one of them should prompt you to move to the next step. Step 4. Check live data. Connect the scan tool again and switch the car to KOEO mode. On the scanner, navigate to live data and lock the TP sensor on the display screen. Use live data graphing if your scanner supports it. Step 6.
Usuallya problem with the EGR pressure feedback sensor will produce a few symptoms that can alert the driver of a potential problem that should be serviced. 1. Engine performance issues. One of the first symptoms of a problem with the EGR pressure sensor is engine performance issues. If the EGR pressure sensor sends any false reading to the 8FAY0e2.
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    • how do you know when your tps sensor is bad