How To Reset The Throttle Position Sensor?

It can be tough to pinpoint the source of engine problems in your vehicle. The throttle body system is one of many components that work jointly to offer steady engine acceleration. If you’re concerned about your throttle body or acceleration or idling problems, check out these throttle body signs to see if your car requires a replacement throttle position sensor and what you can perform to repair, replace or reprogram it.

What Is The Purpose Of The Throttle Position Sensor?

The throttle position sensor keeps track of how far the car’s open throttle valve is, as ascertained by how lower the accelerator pedal is pushed. The amount of air that flows into an engine’s intake manifold is controlled by the throttle position; when it is opened wide, more air flows in; little air circulates in whenever it is pretty much closed.

Throttle Position Sensor

The location of the throttle and how fast it opens or closes is sent to the engine control module, and the computer considers this information when deciding how much fuel to inject and leading to engine sparks. The TPS (throttle position sensor) is positioned on the throttle body (a housing that holds the throttle valve). 

Since the engine control module doesn’t know throttle placement and can’t specify its fuel mixture and even ignition timing correctly, it causes the engine to idle rough, hesitate and trigger a “check engine” warning light through a TPS malfunction.

How Does The Throttle Position Sensor Work?

The throttle body is usually where this sensor is located. It detects the location of the throttle or butterfly valve and sends the data to the engine management unit. This sensor measures how far down your accelerometer pedal is pressed and provides the output current, which is used to determine the pedal’s location. The location of the pedal controls the air circulation of the engine. A tremendous amount of air is delivered to the engine when the valve is wide open and vice versa. This sensor’s output, along with those of other sensors, is sent to the engine control module, which determines the quantity of fuel to inject into your vehicle’s engine.

Also, Read – How To Replace The Crankshaft Sensor?

A three-wired potentiometer is used in this sensor. The resistive layer of the sensor receives 5V power via the first wire. The second wire serves as a ground, while the third wire is attached to the wiper potentiometer and gives input to an engine control system.

There are 3 kinds of throttle position sensors based on their construction. The throttle position sensors have built-in end switches, also referred to as Closed Throttle Position Sensors, the potentiometer type, and a mix of the two are available.

How Do You Test A Throttle Position Sensor?

The resistance or voltage of the TPS is among the most common test. The data will be collected at various throttle positions, including closed, slightly open, and fully open. In this scenario, the first method of testing the throttle position sensor is to use voltage.

To begin, open the hood and take off the cleaner assembly. To determine any impurities or carbon buildup on the throttle plate or the throttle body’s walls, inspect and evaluate them. Finally, look for the TPS, which is found on the throttle body’s side.

How To Reset The Throttle Position Sensor?

Reset The Throttle Position Sensor

First Throttle Sequence

Heat the vehicle’s engine to the proper operating temperature before proceeding with the rest of the procedure. You can accomplish this by leaving the vehicle idle while adding gas to keep it from stalling or driving it safely.

You will not require any tools for this procedure, and it is beneficial in circumstances in which the battery has died, or you require a jump start.

  1. Start the car by turning the key in the ignition.
  2. Without starting the engine, switch the key to the “On” position. To turn it off, wait for several seconds and then turn it off.
  3. Carry out the second step once more.
  4. Start the engine and let it run for a while.
  5. Apply the parking brake on the vehicle.
  6. Place the gear lever in the Drive position.
  7. Wait 5-10 minutes before continuing.

Second Throttle Sequence

It is similar to the first sequence in that it does not involve any tools or expertise, and the engine does not need to be warmed up before performing the second. It is compatible with Toyota Tacoma models manufactured between 2005 and 2015, but it may also be compatible with other models.

  1. Start the car by turning the key in the ignition.
  2. Without starting the engine, switch the key to the “On” position.
  3. Slowly press and hold the gas pedal for three seconds, then slowly release the pedal. Repeat the process three times.
  4. Remove the key from the ignition and place it in the Off position.
  5. Wait 5-10 minutes before continuing.

Disconnecting the Battery

The first approach is a two-step procedure that is quite simple. Lift the hood and look under the car for the car battery. Use the proper tool to detach all of the cables from the battery and set them aside for a few minutes.

It’s time to reattach the wires, but be careful not to overtighten them and risk breaking the clamps. The procedure provides the electronic system with ample time to completely discharge and reboot, much like a smartphone or a laptop.

Resetting the Fuse

Although it is an unusual occurrence, removing the fuse and reinstalling it may resolve the TPS difficulties in some instances. The position of the fuse box varies depending on the type of car, so you’ll need to consult the owner’s manual for guidance.

Once you’ve got access to it, refer to the handbook once more to locate the correct fuse, remove it with fuse pullers, inspect it to ensure it’s in excellent working order, and then connect it back in again.

What Are The Symptoms Of A Bad Throttle Position Sensor?

#1 Inadequate Acceleration 

A faulty TPS can result in a variety of power problems. Although your engine may start, it will have minimal to no power, causing it to shut down. On the other hand, even if you don’t step on the throttle, it can cause your car to accelerate spontaneously.

#2 Stalling In An Inappropriate Manner

Inappropriate stalling is a sure sign that your vehicle’s throttle position sensor is failing. Although stalling might be a symptom of any other automotive problem, this is likely the cause if it occurs frequently. As a result, don’t dismiss the problem. Also, get some fundamental knowledge and auto maintenance recommendations for your car to avoid any significant issues in the future.

#3 Acceleration Of Speed

It is among the most common indications of a spoilt throttle position sensor. The vehicle’s speed can suddenly increase at times. It is most common on highways, where speed surges enhance its speed. To avoid any form of accident, take your car to a professional right away.

#4 Switching Gears Difficulty

With a malfunctioning throttle position sensor, your car may have trouble switching gears. You may experience issues that indicate the car’s sensor isn’t working correctly when changing gears. If this is your car’s only problem, the transmission is likely malfunctioning. If this problem occurs in conjunction with the acceleration problem, it is a sign of a malfunctioning TPS.

#5 Service Light Signaling

The presence of a service light can indicate various things, but one possible cause is a malfunctioning throttle position sensor. A defective sensor does not necessarily mean that the vehicle will explode while driving, although it is a severe problem for you and your vehicle. Take your vehicle to a repair center as quickly as the service light illuminates. If you leave the problem unattended for too long, the automobile may stop working, and you may have trouble repairing it.

Several wrong throttle position 2 symptoms, in addition to the ones listed above, reveal the sensor’s malfunction. Because TPS is small and intricate, it can only be solved by a professional.


Will A Car Run Without A TPS Sensor?

The TPS, or Throttle Position Sensor, informs the ECU about how wide the throttle is opened and how much gasoline is required. Without a TPS, you will drive, but not very well. When you open the throttle, the ECU detects a lean situation in the o2 and attempts to richen it up. The MAP sensor will also tell the ECU how much vacuum you’re pulling, and the ECU will modify fuel and ignition appropriately. You can still drive, but don’t expect to break any 1/4-mile records, and your catalytic converter is going to burn out in a few hundred miles or less.

Can A Tps Sensor Cause No Start?

When a TPS malfunctions, the throttle mechanism of the vehicle ceases to function correctly. If it does not close properly or does not close at all, it poses a significant threat to the user’s safety. If it is left closed, the engine will not receive any air and start at all. Your car will receive excessive air, resulting in a high or variable idle.

Wrapping Up

The TPS sensors’ batteries are designed to endure for five years. They are not replaceable like those in a flashlight since they are incorporated into the sensor. As a result, TPS sensors should be replaced every 5 years.

Inability to shift up, harsh or slow idle, and lack of power when the car is accelerating are symptoms of a malfunctioning throttle position sensor. You and other drivers will be in danger if you drive with these symptoms, so get your automobile repaired as soon as possible.

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