The resistance should increase smoothly as the throttle opens.Slowly move the throttle from its closed position to its fully open position while observing the multimeter.With a multimeter, measure the resistance between the TPS terminals while the key is in the “on” position, but the engine is off.Locate the TPS, typically on the side of your Chevy Trax’s throttle body.The throttle position sensor (TPS) is responsible for communicating the position of the throttle to the engine control module (ECM). Testing the Trax’s Throttle Position Sensor How does the wiring look going into you Trax’s throttle body? If it looks damaged or broken, test and replace it. If you find any issues during your visual inspection, clean the throttle body with a throttle body cleaner and check for improvements in performance. Over time, this buildup (also known as coking) can cause an interruption in air-fuel flow and lead to poor performance.Ĭheck for any corrosion or damage to the throttle body and its components. Your Trax may have a P0172 code (too rich, bank 1) which indicates your car or truck is using too much fuel in relation to the airĭiagnosing a Bad Throttle Body Visual Inspectionīegin by visually inspecting the your Trax’s throttle body for signs of dirt and grime buildup. If your vehicle’’s air-fuel mixture is not optimal or the throttle body isn’t responding accurately, the engine might require more fuel to maintain its performance.Īs a result, you may notice a decrease in MPG’s or frequent fill-ups at the gas station. Decreased Fuel EfficiencyĪ bad throttle body can negatively impact your Trax’s fuel economy. Your Chevy Trax may get the P0171 or P0174 codes, which indicate the air-fuel mixture is lean. If this mixture is not properly regulated, your car may struggle to pick up speed or hesitate when you press the accelerator. This is because the throttle body is responsible for managing the air-fuel mixture that enables your vehicle to accelerate smoothly. When your Trax’s throttle body is not functioning correctly, you could experience acceleration issues. In more severe cases, the engine may stall while idling or experience sporadic high revs.Ī very common indicator of a dirty throttle body is when your vehicle’s engine stalls when coming to a quick stop. If you notice your engine idling poorly or in a rough manner, it could be an indication that your Chevy Trax has a bad throttle body.ĭirt, grime, or coking inside the housing can interrupt the air-fuel flow and disrupt proper engine operation. Rough or Unstable Idle, Stalling Stalling can just as easily indicate bad plugs.Ī failing throttle body may cause a rough or unstable idle. P0121- Throttle position sensor “A” circuit range/performance is the most likely code you’ll experience if your vehicle has a throttle body issue. This makes diagnosing the throttle body much easier. The trouble codes that are stored in the computer can tell a lot about what is actually going on. The check engine light is one of the most common symptoms of a bad throttle body in your Trax. Here are the most common symptoms of a bad throttle body. The symptoms of a bad throttle body can feel identical to a vacuum leak, bad throttle position sensor, clogged air filter, or bad MAF sensor.īad Throttle Body Symptoms A typical throttle body A rough idle is also a very common symptom. So, the symptoms of a bad throttle body will all affect how the vehicle feels responding to your throttle input. You control the throttle body position with the gas pedal. Your Trax’s throttle body controls the amount of air that enters the engine. Common symptoms of a bad throttle body include dirt and grime, the check engine light, and an erratic idle. If your Chevy Trax has a faulty throttle body, it can cause it to run terribly.
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