how to test a throttle body

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

Panda Express Sweet Sauce, Coast Guard Census, No Bake Dog Cake Without Peanut Butter, Drive Through Tent Rental, When To Prune Dogwood In Ontario, Tag Team Finishers Gif,

Leave a Reply

Privacy Policy

Alocore © 2020. All Rights Reserved.
Built in St. Louis by Clicked Studios Web Design Company

Alocore Systems, Inc.
5117 Suson Way Court
St. Louis, MO 63128
Phone: 314-849-8990
Fax: 314-849-8977
info@alocore.com