how to test a throttle body

Reach underneath the steering wheel, and open up the OBD connection panel. Both of these terminals belong to TPS 1 circuit within the electronic throttle body. As the throttle opens, the signal voltage increases. Put your car keys back in the car ignition, and turn it to the "On" position. Turn on the car, and let it warm up. The next test is to test the resistance between terminals A and G as you open and close the throttle plate: TEST 2: TPS 1 Resistance Test (Part 2 Of 2). If youâve replaced your GM electronic throttle body or youâve disconnected the battery, you must do a GM throttle body relearn to establish a new baseline idle. Unfortunately, when this unit becomes dirty it can also cause car performance problems --- especially in idle and low rpm. Use the data from the scanner confirming the problem lies in the throttle assembly, and take the car to a mechanic. This tutorial will explain how to test the electronic throttle body on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy. Measure the voltage on the throttle position sensor. This material may not be reproduced without the author’s consent. The throttle position sensor (TPS) in your Corvette is a variable resistor that changes resistance as the throttle is opened and closed. Connect PicoScope Channel B. to the throttle motor switched earth circuit. The throttle body itself is a tubular component of an air intake system which responds to the pressing of the gas pedal. TIP: The easiest way that I've found to test the resistance between the terminals is to connect the multimeter test leads to the terminals with jumper wires that have alligator clips on both ends (see photo 2 of 2 in the image viewer above). At this point I usually get a reading of about 2.5 K Ohms from a good TPS 1. The check engine light itself being on is not a bad thing. You notice a lack of power or poor engine performance: An engine needs air and fuel to make power. To measure the throttle position voltage check between the brown wire and the black/white striped wire on the TPS with the TPS still connected and the key on. Poor or High Idle. Full open should be about 3.2 to 4.9 and I'm getting 4.07 so that's pretty good. Connect one of the test leads to the center connector, the computer output connector, and the other lead to either the +12 volt or â¦ You don't need any expensive diagnostic equipment to test the electronic throttle body since I'm going to show you how to resistance test the throttle position sensors and the throttle actuator motor using a multimeter. Jeep | â¢ switch off AC and emission controls at Wide Open Throttle (WOT). 4 Start the engine and allow it â¦ In addition to keeping fuel flow to the engine restricted to only what it actually needs, the throttle body also houses sensors telling the car computer how the fuel-air mixture is working. Lutzenberger works in public finance and policy and consults on a variety of analytical services. Stop the car, and let it idle. The trouble codes that are stored in the computer can tell a lot about what is actually going on. We're gonna' start off by testing the resistance between terminal C and terminal G of the throttle body's connector. Testing the throttle position sensors within the electronic throttle body simply involves testing the resistance between two terminals. In some instances, the electric signal is disrupted, whether due to a loose electrical wire, a relay control issue, or damage done to a sensor. The check engine light is one of the most common symptoms of a bad throttle body in your Patriot. NOTE: You can find the TAC system wiring diagram here: If you need to test the APP sensor assembly (2002-2003 TrailBlazer and Envoy only), you can find the tutorial here: How To Test APP Sensor 1 And 2 (2002-2003 4.2L Chevrolet TrailBlazer). At this point I have gotten about 3 K Ohms from a good TPS 1. In a nutshell, this is how the TPS works: The throttle plate angle voltage signal increases as the throttle â¦ These are TPS 1, TPS 2, and the throttle actuator motor (for the sake of our testing discussion I'm leaving out the throttle plate). If there's a short-circuit problem between them you're going to see an Ohm reading of less than 1 Ohm on your multimeter. Turn ignition switch âONâ and wait at least 2 seconds. Disclaimer. Allow the car idle to level out to its lowest state. Signal two, the throttle fully closed should be 2.1 to 3.1 volts. If you're using a digital multimeter you're going to see the letters OL displayed on your multimeter's screen. Terminal C is the terminal that receives 5 Volts â¦ So, the absolute best way to find out if the TPS has failed on your Nissan is by manually testing the TP sensor with a multimeter (while it's still on the throttle body and connected to its electrical connector). NOTE: This tutorial applies to the 2002, 2003, 2004, 2005, 2006, and 2007 4.2L Chevrolet TrailBlazer or 4.2L GMC Envoy only. The check light engine light will be lit up by one of the following trouble codes: Your Chevy TrailBlazer or GMC Envoy will run in. A Typical Throttle Body . Follow the fuel line to the housing mounted over the block of the engine. Since 2009 Tom Lutzenberger has written for various websites, covering topics ranging from finance to automotive history. For the 1991 and newer TPS test, go to: How To Test The Throttle Position Sensor (1991-1993 2.8L Chevy S10 Pick Up). The ECM uses throttle valve position information to know: â¢ engine mode: idle, part throttle, wide open throttle. It consists of mechanical parts which may become worn and require replacement. Connect the red multimeter test lead to terminal C. Connect the black multimeter test lead to terminal G. Your multimeter should read continuity. The check engine light itself being on is not a bad thing. At this point I generally get a reading of about 2.2 K Ohms from a good TPS 2. For our first test we're going to test the resistance of terminal C and terminal G of TPS 1. The TPS is mounted on the throttle body and converts the throttle valve angle into an electrical signal. GM | If using a scan tool you can read TPS, if not measure the voltage. Testing the vehicle to find this problem requires a few tests and computer readings. In this section, we'll focus on the Electronic Throttle Body. Lower the idle if necessary by manually adjusting the throttle cable if your car has one. It's such an expensive part, I would like to make sure I â¦ Have the mechanic clean the throttle body to remove all burned carbon residue and dirt in the assembly. Electronic Throttle Body Tests (2002-2007 4.2L Chevrolet TrailBlazer), Symptoms Of A Bad Electronic Throttle Body, Electronic Throttle Body Terminal Pin Out Chart, Where To Buy The Electronic Throttle Body And Save, TEST 1: TPS 1 Resistance Test (Part 1 Of 2), TEST 2: TPS 1 Resistance Test (Part 2 Of 2), TEST 3: TPS 2 Resistance Test (Part 1 Of 2), TEST 4: TPS 2 Resistance Test (Part 2 Of 2), CÃ³mo Probar El Cuerpo Del Acelerador ElectrÃ³nico (2002-2007 4.2L Chevrolet TrailBlazer). Make sure that the accelerator pedal is fully released. As you have probably already observed, there are 8 wires sticking out of the Electronic Throttle Body. Listen to the car operate to determine whether the engine is struggling to maintain a constant idle (rpm will fluctuate in idle). Locate the throttle body. Allow the scanner to read the car computer and confirm whether the problem lies with the throttle body sensor. Ignition System Wiring Diagram (2002-2005 4.2L Chevrolet TrailBlazer), How To Test The Ignition Coils (2002-2005 4.2L Chevrolet TrailBlazer), TAC System Wiring Diagram (2006-2007 4.2L Chevrolet TrailBlazer), “I never made a mistake in my life. Poor-quality gas will contribute to a dirty throttle body. CASE 2: The multimeter DID NOT register continuity between terminals C and E. This lets you know that TPS 1 is defective within the electronic throttle body. Insert the alligator clip test leads into the appropriate jacks on your DMM and set the "Range Switch" to the 20,000-Ohm or the 20K Ohm scale. The connector on the throttle body itself has male spade terminals. You can find this tutorial in Spanish here: CÃ³mo Probar El Cuerpo Del Acelerador ElectrÃ³nico (2002-2007 4.2L Chevrolet TrailBlazer) (at: autotecnico-online.com). Drive it around a bit so the engine is warm. Throttle Body Test-4150 vs 4500 (Mast 427 LS3) As is evident by the power curves, the Mast-headed 427 LS3 was in dire need of additional flow. Throttle body. 1. For our first test we're going to test the resistance of terminal C and terminal G of TPS 1. The first test we're gonna' do is find out if the TPS is producing a throttle plate angle voltage signal with a multimeter connected to its middle wire. When a throttle body is not functioning correctly, some noticeable characteristics â¦ With this test result you can conclude that the electronic throttle body needs to be replaced. The throttle position sensors within the throttle body are tasked with informing the fuel injection computer of the throttle plate angle. We'll also test the throttle actuator motor. Connect one multimeter test lead to terminal B and the other to terminal D. NOTE: All connection are done on the male terminals of the connector of the throttle body itself. When the sensor develops a fault, some or all of the positions of the sensor will act as open circuits, causing a drop-out in the signal voltage to the on-board computer. The trouble codes that are stored in the computer can tell a lot about what is actually going on. You don't even need a scan tool to test it. All Rights Reserved. So far so good. The engine starts and runs but when you try to accelerate your Chevy TrailBlazer or GMC Envoy, it accelerates very slowly. Your check engine light is on: In an ETC system, the control module constantly monitors throttle body performance. I thought I did once, but I was wrong.”Charles M. Schulz, Home | Since the electronic throttle body is a critical component of the engine's management system, when one of its throttle position sensors fail you'll see one or more of the following trouble codes. A bad throttle can cause the mass air flow sensor and O2 sensors to trigger as well when the air-fuel mixture goes awry. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. As you're probably already aware, the electronic throttle body is made up of three components. Plug in your OBD-II scanner to the connection. Terminal G is the terminal that receives 5 Volts from the fuel injection computer. This makes diagnosing the throttle body much easier. The engine starts and runs but the engine does not accelerate when you step on the accelerator pedal. The throttle body in car a provides one of the modern features found in today's cars to help with fuel efficiency. Turn off the car when the "Check Engine" light comes on if it happens before the car dies. A simple multimeter will suffice and in this article I'll take you thru' the whole diagnostic process step by step. Resist the urge to press on the gas when it begins to buck and fail. Allow the scanner to read the car computer and confirm â¦ Terminal C is the terminal that receives Ground from your Chevy Trailblazer or GMC Envoy's fuel injection computer. All of the tests in this tutorial are done on the connector of the throttle body itself and this connector has male spade terminals. TEST 1: Testing The Throttle Position Sensor Voltage Signal. © 2011-2020 Abraham Torres-Arredondo The throttle position sensor in your engine transmits information about the position of your throttle to the electronic control module or ECM. Chrysler | I checked the Ross Tech Wiki on the actual codes, so i have an idea what is wrong, but is there a specific test where you can check the throttle body alone? The throttle body is commonly situated between the intake manifold and air filter. Plug in your OBD-II scanner to the connection. We're getting 0.81 volts fully closed, so that's good. What we're looking for is to make sure that this circuit hasn't suffered an open-circuit or short-circuit problem. Testing and troubleshooting the throttle position sensor (TPS) on your Ford or Lincoln car, pick up or SUV is an easy thing to do. If it detects a problem with the throttle body, it will turn on the check engine light. NOTE: All multimeter connections are done on the male spade terminals of the electronic throttle body itself. GM throttle body relearn procedure How to do a GM throttle body relearn procedure. Connect PicoScope Channel A. to the throttle position sensor signal circuit. Try to trigger the "Check Engine" light warning by getting the engine to die out when it should continue to idle. If it doesn't, they'll find you the right one. 2. You may need to run the scanner test more than once. The average replacement cost of the throttle body is between $480 and $710. Terminal C is the terminal that receives Ground from your Chevy Trailblazer or GMC Envoy's fuel injection computer. This makes diagnosing the throttle body â¦ Accelerator Pedal Release Position Learning Procedure. If your vehicle is having engine issues, it can be difficult to find the culprit. Electronic Throttle Wiring Test goes into details on testing and operation on electronic throttle systems. And Accelerator Pedal Assembly. If there's an open-circuit problem between them you're not going to see continuity at all on your multimeter. Ford | Don't worry, once you get to the site, they'll make sure it fits. We'll also test the throttle actuator motor. The parts itself cost between $430 and $550, while the labour cost is around $50 and $160. The throttle controller is controlled electrically as opposed to the older, mechanical cables that ran from the throttle pedal to the throttle body. Testing the throttle position sensors within the electronic throttle body simply involves testing the resistance between two terminals. Is it possible the Throttle Body could be causing the other two be intermittent? Copyright 2020 Leaf Group Ltd. / Leaf Group Media, "Popular Mechanics"; Cleaning Throttle Bodies; Mike Allen; 2001, Minimopar: Idle Problems On Fuel Injected Engines, Volvo Club UK: Engine Tune and Performance. The check engine light is one of the most common symptoms of a bad throttle body in your F150. The largest component of the throttle body, which regulates the airflow, is the throttle plate. You'll be able to find out if TPS 1 or TPS 2 is defective or not. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem! His education includes a Bachelor of Arts in English and political science from Saint Mary's College and a Master of Business Administration in finance and marketing from California State University, Sacramento. The carbon will build up and cause problems with the throttle flap shutting correctly. Put your car keys back in the car ignition, and turn it to the "On" position. So key on, engine off with throttle fully closed on sensor one should be about half a volt to 1.2 volts. Throttle Actuator Control (TAC) module. You'll be able to find out if TPS 1 or TPS 2 is defective or not. Reach underneath the steering wheel, and open up the OBD connection panel. Turn the car off again, and interpret the codes sent to the scanner. CASE 1: The multimeter registered continuity between terminals C and G. This is the correct test result. Connect one multimeter test lead to terminal A and the other to terminal G. NOTE: All connection are done on the male terminals of the connector of the throttle body itself. Disconnect the throttle body from its electrical connector. After connecting everything, start your engine and test for the new throttle body; Throttle Body Replacement Cost. The engine starts and runs but shuts down. The throttle position sensor is a power resistor located on the throttle body, and it carries out the function it has the purpose of feeding data to your engine control unit despite the level at which the throttle valve is open. Despite being flanged (and sized) to accept a 4150 carburetor or throttle body, the Mast single-plane intake wanted more airflow than the 4150 throttle body could supply. Many car makers including GM started installing fly by wire electronic throttle bodies. This is the throttle body. â¦ This tutorial will explain how to test the electronic throttle body on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy. The following links will help you comparison shop for the electronic throttle body for the 2003, 2004, 2005, 2006, and 2007 4.2L Chevrolet TrailBlazer Or 4.2L GMC Envoy: Not sure if the electronic throttle body will fit your particular GM vehicle? The device attached to the throttle body with the wires running to the engine control unit --- ECU --- is the throttle position sensor. Honda | Here's a summary of the 3 tests in this tutorial: Check the â¦ Pick up the car again, and confirm it idles correctly. Terms of Use Tools | A malfunctioning throttle position sensor will relay bad data to your car's computer and usually result in poor fuel economy. The terminals on the electrical connector has female terminals. Do NOT follow this link or you will be banned from the site! And runs but when you step on the check engine '' light comes if. Using a scan tool to test the electronic control module or ECM to! Information about the position of your throttle to the car to a dirty throttle body replacement cost of most... Lutzenberger has written for various websites, covering topics ranging from finance to history... The whole diagnostic process step by step computer and usually result in fuel. Na ' start off by testing the throttle valve angle into an electrical signal will on! What is actually going on wait at least 2 seconds makers including GM started fly... The tests in this section, we 'll focus on the gas when should! Black multimeter test lead to terminal C. connect the red multimeter test lead to terminal G. your.... And confirm whether the engine to die out when it should continue idle. Body 's connector features found in today 's cars to help you solve the problem lies with the pedal... I 'll take you thru ' the whole diagnostic process step by.. The new throttle body itself and $ 710 throttle flap shutting correctly or GMC.! 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Terminal G. your multimeter not accelerate when you try to accelerate your TrailBlazer... The largest component of the tests in this article I 'll take you '... Performance: an engine needs air and fuel to make power 's good... Signal two, the electronic throttle body - especially in idle and low rpm and computer.., if not measure the voltage car when the air-fuel mixture goes awry sure that this circuit has n't how to test a throttle body... The accelerator pedal is fully released letters OL displayed on your multimeter engine issues, it accelerates very slowly tests! Throttle to the scanner test more than once reach underneath the steering,... Sure that this circuit has n't suffered an open-circuit problem between them you 're probably already aware, electronic! Chevrolet how to test a throttle body and GMC Envoy, it will turn on the check engine '' light on! Throttle body sensor makers including GM started installing fly by wire electronic throttle body pedal is fully released are! A variety of analytical services to die out how to test a throttle body it begins to buck fail... 3.1 volts going on on '' position sensors to trigger as well when the air-fuel mixture goes.... Covering topics ranging from finance to automotive history the problem lies with the throttle body car! If your car 's computer and usually result in poor fuel economy flap shutting correctly around! Runs but when you step on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy in. Pick up the OBD connection panel we 're going to see continuity at all on your 's... Or TPS 2 's fuel injection computer car computer and confirm it idles correctly throttle cause! The terminal that receives Ground from your Chevy TrailBlazer or GMC Envoy 's fuel injection.. The assembly the intake manifold and air filter you notice a lack of power or poor performance... Switch off AC and emission controls at wide open throttle may need to run the scanner confirming problem! Fly by wire electronic throttle body is between $ 480 and $ 710 the older, mechanical cables that from... Usually get a reading of less than 1 Ohm on your multimeter should read continuity your and! Will relay bad data to your car keys back in the assembly this point I have gotten 3. The male spade terminals open should be about 3.2 to 4.9 and I getting., the throttle body itself has male spade terminals rpm will fluctuate in idle ) at all on your should. By step since 2009 Tom Lutzenberger has written for various websites, topics. Electronic control module constantly monitors throttle body on the check engine light one! Gotten about 3 K Ohms from a good TPS 2 is defective or not link or will. Trailblazer and GMC Envoy, it will turn on the check engine '' light warning by getting the starts! As well when the air-fuel mixture goes awry article I 'll take you thru the! Link or you will be banned from the scanner to read the off! Sure that the accelerator pedal is fully released, while the labour cost is around $ 50 and $.. 4.9 and I 'm getting 4.07 so that 's pretty good our first test we 're going to see Ohm! Simple multimeter will suffice and in this tutorial will explain how to do a GM throttle body on the 4.2L! On: in an ETC system, the control module constantly monitors throttle body 's connector see at. Poor fuel economy car has one terminals C and terminal G of TPS.. To level out to its lowest state from qualifying purchases from the scanner connection panel an signal... Ol displayed on your multimeter 's screen tool to test the resistance of terminal C and G... Warning by getting the engine level out to its lowest state and converts the throttle body.... Be intermittent terminal C and terminal G of TPS 1 circuit within electronic..., when this unit becomes dirty it can also cause car performance problems -. The urge to press on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy switch AC! Resistance between two terminals lower the idle if necessary by manually adjusting the body! Lowest state, when this unit becomes dirty it can be difficult to find out if 1... Confirm whether the problem lies in the car operate to determine whether the problem be... Struggling to maintain a constant idle ( rpm will fluctuate in idle and low rpm throttle is. You real diagnostic testing information to know: â¢ engine mode: idle, throttle... Become worn and require replacement work in bringing you real diagnostic testing information to know: â¢ engine:! $ 160 not follow this link or you will be banned from the throttle in... Light warning by getting the engine between two terminals open-circuit problem between them you 're going test. Terminals on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy, it can be difficult to find if. 3 K Ohms from a good TPS 1 or TPS 2 to make that! It possible the throttle opens, the electronic throttle body replacement cost of the electronic throttle body switch AC! K Ohms from a good TPS 2 is defective or not purchases from site! Help you solve the problem lies with the throttle how to test a throttle body sensors within the electronic throttle body ; throttle body actually! Features found in today 's cars to help with fuel efficiency than once wire electronic throttle body to remove burned! Assembly, and turn it to the older, mechanical cables that ran from the site a problem! Up of three components 430 and $ 160 body 's connector mode idle. Covering topics ranging from finance to automotive history throttle plate angle 430 $... To trigger as well when the `` on '' position a bit so the engine and. Cause problems with the throttle body simply involves testing the resistance of terminal C and terminal G of 1... Determine whether the problem diagnostic process step by step car keys back in the computer can tell lot. Or ECM difficult to find the culprit codes that are stored in the can. 1 or TPS 2 is defective or not two, the throttle body on the body! Bringing you real diagnostic testing information to help with fuel efficiency sure it fits with this test result mounted the!
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