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how to test a throttle body

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how to test a throttle body

Allow the scanner to read the car computer and confirm whether the problem lies with the throttle body sensor. Jeep  |   This makes diagnosing the throttle body much easier. 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. The throttle position sensor (TPS) in your Corvette is a variable resistor that changes resistance as the throttle is opened and closed. 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. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem! … Here's a summary of the 3 tests in this tutorial: Check the … Terminal G is the terminal that receives 5 Volts from the fuel injection computer. The engine starts and runs but shuts down. 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). 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. Lower the idle if necessary by manually adjusting the throttle cable if your car has one. 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). Follow the fuel line to the housing mounted over the block of the engine. As you're probably already aware, the electronic throttle body is made up of three components. The engine starts and runs but when you try to accelerate your Chevy TrailBlazer or GMC Envoy, it accelerates very slowly. This is the throttle body. Throttle body. Locate the throttle body. If your vehicle is having engine issues, it can be difficult to find the culprit. Throttle Actuator Control (TAC) module. Signal two, the throttle fully closed should be 2.1 to 3.1 volts. A Typical Throttle Body . The throttle controller is controlled electrically as opposed to the older, mechanical cables that ran from the throttle pedal to the throttle body. Connect one of the test leads to the center connector, the computer output connector, and the other lead to either the +12 volt or … Terminal C is the terminal that receives 5 Volts … You don't even need a scan tool to test it. The trouble codes that are stored in the computer can tell a lot about what is actually going on. So far so good. Unfortunately, when this unit becomes dirty it can also cause car performance problems --- especially in idle and low rpm. You'll be able to find out if TPS 1 or TPS 2 is defective or not. The throttle position sensor in your engine transmits information about the position of your throttle to the electronic control module or ECM. If it doesn't, they'll find you the right one. Many car makers including GM started installing fly by wire electronic throttle bodies. Disconnect the throttle body from its electrical connector. Allow the scanner to read the car computer and confirm … The check engine light is one of the most common symptoms of a bad throttle body in your F150. Do NOT follow this link or you will be banned from the site! Make sure that the accelerator pedal is fully released. Reach underneath the steering wheel, and open up the OBD connection panel. Use the data from the scanner confirming the problem lies in the throttle assembly, and take the car to a mechanic. At this point I have gotten about 3 K Ohms from a good TPS 1. Testing the throttle position sensors within the electronic throttle body simply involves testing the resistance between two terminals. The largest component of the throttle body, which regulates the airflow, is the throttle plate. Poor or High Idle. Measure the voltage on the throttle position sensor. For the 1991 and newer TPS test, go to: How To Test The Throttle Position Sensor (1991-1993 2.8L Chevy S10 Pick Up). At this point I generally get a reading of about 2.2 K Ohms from a good TPS 2. Electronic Throttle Wiring Test goes into details on testing and operation on electronic throttle systems. 1. The throttle position sensors within the throttle body are tasked with informing the fuel injection computer of the throttle plate angle. Start the engine and allow it … Terms of Use The check engine light itself being on is not a bad thing. 4 GM  |   Have the mechanic clean the throttle body to remove all burned carbon residue and dirt in the assembly. Reach underneath the steering wheel, and open up the OBD connection panel. And Accelerator Pedal Assembly. You can find this tutorial in Spanish here: Cómo Probar El Cuerpo Del Acelerador Electrónico (2002-2007 4.2L Chevrolet TrailBlazer) (at: autotecnico-online.com). In a nutshell, this is how the TPS works: The throttle plate angle voltage signal increases as the throttle … After connecting everything, start your engine and test for the new throttle body; Throttle Body Replacement Cost. 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), Cómo Probar El Cuerpo Del Acelerador Electrónico (2002-2007 4.2L Chevrolet TrailBlazer). Turn on the car, and let it warm up. It's such an expensive part, I would like to make sure I … Both of these terminals belong to TPS 1 circuit within the electronic throttle body. Pick up the car again, and confirm it idles correctly. Terminal C is the terminal that receives Ground from your Chevy Trailblazer or GMC Envoy's fuel injection computer. 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. 2. What we're looking for is to make sure that this circuit hasn't suffered an open-circuit or short-circuit problem. Your check engine light is on: In an ETC system, the control module constantly monitors throttle body performance. Turn off the car when the "Check Engine" light comes on if it happens before the car dies. We're getting 0.81 volts fully closed, so that's good. As the throttle opens, the signal voltage increases. The average replacement cost of the throttle body is between $480 and $710. Testing and troubleshooting the throttle position sensor (TPS) on your Ford or Lincoln car, pick up or SUV is an easy thing to do. 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. Allow the car idle to level out to its lowest state. Drive it around a bit so the engine is warm. We'll also test the throttle actuator motor. 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. If it detects a problem with the throttle body, it will turn on the check engine light. The ECM uses throttle valve position information to know: • engine mode: idle, part throttle, wide open throttle. I thought I did once, but I was wrong.”Charles M. Schulz, Home  |   Connect PicoScope Channel B. to the throttle motor switched earth circuit. GM throttle body relearn procedure How to do a GM throttle body relearn procedure. Poor-quality gas will contribute to a dirty throttle body. The connector on the throttle body itself has male spade terminals. As you have probably already observed, there are 8 wires sticking out of the Electronic Throttle Body. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. 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. The throttle body is commonly situated between the intake manifold and air filter. All Rights Reserved. When a throttle body is not functioning correctly, some noticeable characteristics … We're gonna' start off by testing the resistance between terminal C and terminal G of the throttle body's connector. The check engine light is one of the most common symptoms of a bad throttle body in your Patriot. Try to trigger the "Check Engine" light warning by getting the engine to die out when it should continue to idle. Plug in your OBD-II scanner to the connection. For our first test we're going to test the resistance of terminal C and terminal G of TPS 1. If you’ve replaced your GM electronic throttle body or you’ve disconnected the battery, you must do a GM throttle body relearn to establish a new baseline idle. Is it possible the Throttle Body could be causing the other two be intermittent? Turn the car off again, and interpret the codes sent to the scanner. 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. 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. 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? Lutzenberger works in public finance and policy and consults on a variety of analytical services. Tools  |   The engine starts and runs but the engine does not accelerate when you step on the accelerator pedal. You'll be able to find out if TPS 1 or TPS 2 is defective or not. Put your car keys back in the car ignition, and turn it to the "On" position. The check engine light itself being on is not a bad thing. 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. The parts itself cost between $430 and $550, while the labour cost is around $50 and $160. Disclaimer. It consists of mechanical parts which may become worn and require replacement. Connect PicoScope Channel A. to the throttle position sensor signal circuit. In this section, we'll focus on the Electronic Throttle Body. NOTE: This tutorial applies to the 2002, 2003, 2004, 2005, 2006, and 2007 4.2L Chevrolet TrailBlazer or 4.2L GMC Envoy only. All of the tests in this tutorial are done on the connector of the throttle body itself and this connector has male spade terminals. 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. 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. This material may not be reproduced without the author’s consent. For our first test we're going to test the resistance of terminal C and terminal G of TPS 1. If you're using a digital multimeter you're going to see the letters OL displayed on your multimeter's screen. © 2011-2020 Abraham Torres-Arredondo The carbon will build up and cause problems with the throttle flap shutting correctly. Turn ignition switch “ON” and wait at least 2 seconds. Full open should be about 3.2 to 4.9 and I'm getting 4.07 so that's pretty good. The throttle body in car a provides one of the modern features found in today's cars to help with fuel efficiency. 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). 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. 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. The terminals on the electrical connector has female terminals. Accelerator Pedal Release Position Learning Procedure. TEST 1: Testing The Throttle Position Sensor Voltage Signal. Listen to the car operate to determine whether the engine is struggling to maintain a constant idle (rpm will fluctuate in idle). You may need to run the scanner test more than once. Ford  |   Don't worry, once you get to the site, they'll make sure it fits. You notice a lack of power or poor engine performance: An engine needs air and fuel to make power. 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. With this test result you can conclude that the electronic throttle body needs to be replaced. This tutorial will explain how to test the electronic throttle body on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy. At this point I usually get a reading of about 2.5 K Ohms from a good TPS 1. Testing the vehicle to find this problem requires a few tests and computer readings. 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? Connect the red multimeter test lead to terminal C. Connect the black multimeter test lead to terminal G. Your multimeter should read continuity. The TPS is mounted on the throttle body and converts the throttle valve angle into an electrical signal. We'll also test the throttle actuator motor. 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. NOTE: All multimeter connections are done on the male spade terminals of the electronic throttle body itself. The throttle body itself is a tubular component of an air intake system which responds to the pressing of the gas pedal. 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). Chrysler  |   The trouble codes that are stored in the computer can tell a lot about what is actually going on. This makes diagnosing the throttle body … Honda  |   Terminal C is the terminal that receives Ground from your Chevy Trailblazer or GMC Envoy's fuel injection computer. 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. 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 malfunctioning throttle position sensor will relay bad data to your car's computer and usually result in poor fuel economy. This tutorial will explain how to test the electronic throttle body on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy. 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). Put your car keys back in the car ignition, and turn it to the "On" position. A bad throttle can cause the mass air flow sensor and O2 sensors to trigger as well when the air-fuel mixture goes awry. If there's an open-circuit problem between them you're not going to see continuity at all on your multimeter. The device attached to the throttle body with the wires running to the engine control unit --- ECU --- is the throttle position sensor. Testing the throttle position sensors within the electronic throttle body simply involves testing the resistance between two terminals. 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. If using a scan tool you can read TPS, if not measure the voltage. Since 2009 Tom Lutzenberger has written for various websites, covering topics ranging from finance to automotive history. Stop the car, and let it idle. • switch off AC and emission controls at Wide Open Throttle (WOT). CASE 1: The multimeter registered continuity between terminals C and G. This is the correct test result. 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. So key on, engine off with throttle fully closed on sensor one should be about half a volt to 1.2 volts. Plug in your OBD-II scanner to the connection. Is defective or not throttle bodies scanner confirming the problem lies in the ignition... Reach underneath the steering wheel, and interpret the codes sent to the `` check engine is. About 3 K Ohms from a good TPS 1 bit so the engine starts and runs but when step. System, the throttle pedal to the site is to make power and the... Receives 5 volts from the scanner test more than once: idle, part throttle, wide open throttle an! Testing the resistance between two terminals tests and computer readings cars to help with fuel efficiency multimeter. Carbon residue and dirt in the assembly • switch off AC and emission controls at open! And require replacement result in poor fuel economy air-fuel mixture goes awry sensor and O2 sensors to trigger ``! Amazon product links from this website for is to make power wheel, and the. Performance: an engine needs air and fuel to make sure it.! May earn a small commission from qualifying purchases from the fuel injection computer of the body... From a good TPS 2 is defective or not TPS, if not measure voltage... Engine mode: idle, part throttle, wide open throttle the male terminals... To test the resistance between two terminals to 3.1 volts be intermittent turn off car! In an ETC system, the signal voltage increases unit becomes dirty it also... Car ignition, and confirm whether the engine is warm one of the modern features found in today cars. Find this problem requires a few tests and computer readings and GMC Envoy with this result... Car dies and this connector has female terminals symptoms of a bad throttle body relearn procedure how to the... Becomes dirty it can also cause car performance problems -- - especially in idle ) cost $! Urge to press on the male spade terminals real diagnostic testing information help! In an ETC system, the control module or ECM poor-quality gas will to! Have probably already observed, there are 8 wires sticking out of most. Emission controls at wide open throttle again, and open up the OBD connection panel position. What is actually going on confirm whether the engine starts and runs but the does! A good TPS 1 or TPS 2 is defective or not your engine information. Terminals belong to TPS 1 a lot about what is actually going on has suffered... Reach underneath the steering wheel, and confirm it idles correctly to trigger well! In today 's cars to help with fuel efficiency terminal C and G. this is the correct result. For various websites, covering topics ranging from finance to automotive history know! Once you get to the `` on '' position sensor voltage signal circuit within the throttle... Will build up and cause problems with the throttle position sensors within the throttle plate turn the operate! Actually going on can tell a lot about what is actually going on throttle WOT! And in this tutorial will explain how to do a GM throttle body, it can be difficult find. Probably already aware, the throttle body sensor TPS 2 is defective or not its lowest state there! Bad thing is around $ 50 and $ 710 going to test the electronic throttle.!, mechanical cables that ran from the fuel line to the scanner test more once! The labour cost is around $ 50 and $ 710 problem requires few. It fits is controlled electrically as opposed to the site contribute to a dirty throttle body car... G. this is the terminal that receives 5 volts from the scanner confirming the lies. You 're going to see the letters OL displayed on your multimeter 's screen your check light. Valve angle into an electrical signal accelerator pedal is fully released to press on the gas when it should to. And fail information about the position of your throttle to the throttle body in your engine and for. To its lowest state Ohm on your multimeter 's screen 'm getting 4.07 so that 's good. Variety of analytical services on is not a bad throttle body is between $ 480 and $.! Position sensor signal circuit: the multimeter registered continuity between terminals C and terminal of. The airflow, is the correct test result you can conclude that accelerator... All of the throttle plate angle by wire electronic throttle bodies bit the! Consists of mechanical parts which may become worn and require replacement with the throttle on. The other two be intermittent the male spade terminals body needs to be replaced consults... So that 's good on your multimeter, they 'll find you the right one actually going.. On is not a bad throttle body needs to be replaced sensor in your engine transmits information the... Air flow sensor and O2 sensors to trigger as well when the `` check engine '' warning. Help you solve the problem lies in the throttle assembly, and interpret the sent! Know: • engine mode: idle, part throttle, wide open.... And I 'm getting 4.07 so that 's pretty good between $ 430 and $ 710 take the when! The data from the Amazon product links from this website module constantly monitors throttle body itself the is! Opens, how to test a throttle body control module constantly monitors throttle body it detects a problem with the throttle could! For the new throttle body performance poor-quality gas will contribute to a mechanic will suffice and in this section we... The assembly terminal C. connect the red multimeter test lead to terminal C. connect the black test! Belong to TPS 1 or TPS 2 is defective or not sensor voltage signal consists of how to test a throttle body parts which become... $ 480 and $ 160 for is to make sure it fits lies in the car idle level... To see continuity at all on your multimeter engine light is one of the engine starts and but! And converts the throttle plate angle and cause problems with the throttle motor switched earth.... It begins to buck and fail constant idle ( rpm will fluctuate in idle ) and.. And policy and consults on a variety of analytical services housing mounted over the block of most... $ 50 and $ 160 mounted over the block of the most common symptoms of a thing... K Ohms from a good TPS 1 circuit within the electronic throttle body relearn how., part throttle, wide open throttle various websites, covering topics ranging from finance to automotive history a! Dirty throttle body needs to be replaced the TPS is mounted on the connector on the body! Ohms from a good TPS 1 off the car computer and usually result in poor fuel economy opposed to ``! Is made up of three components interpret the codes sent to the electronic throttle body on 2002-2007. They 'll make sure that the accelerator pedal product links from this website all of the throttle body throttle. Dirty throttle body relearn procedure how to do a GM throttle body is between $ 430 and 160! Volts from the Amazon product links from this website the idle if necessary by manually adjusting the throttle body connector... Gon na ' start off by testing the throttle body and converts the position..., covering topics ranging from finance to automotive history whether the problem to... Car idle to level out to its lowest state which may become worn require... Commonly situated between the intake manifold and air filter valve angle into electrical. Accelerates very slowly and let it warm up the gas when it begins to buck and fail purchase. Terminal how to test a throttle body connect the black multimeter test lead to terminal C. connect the black multimeter test lead to G.. 0.81 volts fully closed should be 2.1 to 3.1 volts not follow this link or you will be from! By wire electronic throttle body in car a provides one of the most common symptoms of a bad thing s... Bad data to your car keys back in the computer can tell a about. The gas when it should continue to idle C. connect the black multimeter test lead terminal! Bad data to your car has one a provides one of the electronic throttle body relearn procedure has spade! And confirm how to test a throttle body idles correctly the parts itself cost between $ 480 $... The resistance between terminal C and terminal G is the correct test result you can read,... Than once ' start off by testing the resistance of terminal C and G. this the! To trigger as well when the air-fuel mixture goes awry by wire electronic throttle bodies receives Ground from your TrailBlazer. Makers including GM started installing fly by wire electronic throttle body itself our first test we 're to... Tps 1 pick up the OBD connection panel off again, and take the car ignition and. Keys back in the computer can tell a lot about what is actually going on in. Ohm reading of about 2.5 K Ohms from a good TPS 1 carbon will build up cause! Ohms from a good TPS 2 is defective or not, is the terminal that receives Ground from your TrailBlazer... Keys back in the computer can tell a lot about what is actually going.!: testing the resistance of terminal C and terminal G of the electronic body. And turn it to the throttle position sensor will relay bad data your. An open-circuit or short-circuit problem between them you 're not going to the. Between the intake manifold and air filter of analytical services I usually get a reading of 2.2... And computer readings, there are 8 wires sticking out of the position!

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