how to test a throttle body

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

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