Full open should be about 3.2 to 4.9 and I'm getting 4.07 so that's pretty good. We're gonna' start off by testing the resistance between terminal C and terminal G of the throttle body's connector. Make sure that the accelerator pedal is fully released. Drive it around a bit so the engine is warm. If it doesn't, they'll find you the right one. The throttle body in car a provides one of the modern features found in today's cars to help with fuel efficiency. Testing the vehicle to find this problem requires a few tests and computer readings. The largest component of the throttle body, which regulates the airflow, is the throttle plate. 1. At this point I generally get a reading of about 2.2 K Ohms from a good TPS 2. Locate the throttle body. As the throttle opens, the signal voltage increases. 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. Tools  |   Listen to the car operate to determine whether the engine is struggling to maintain a constant idle (rpm will fluctuate in idle). It consists of mechanical parts which may become worn and require replacement. Unfortunately, when this unit becomes dirty it can also cause car performance problems --- especially in idle and low rpm. The average replacement cost of the throttle body is between $480 and $710. 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. NOTE: This tutorial applies to the 2002, 2003, 2004, 2005, 2006, and 2007 4.2L Chevrolet TrailBlazer or 4.2L GMC Envoy only. A simple multimeter will suffice and in this article I'll take you thru' the whole diagnostic process step by step. Many car makers including GM started installing fly by wire electronic throttle bodies. 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. The trouble codes that are stored in the computer can tell a lot about what is actually going on. Allow the car idle to level out to its lowest state. 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 may need to run the scanner test more than once. CASE 1: The multimeter registered continuity between terminals C and G. This is the correct test result. I thought I did once, but I was wrong.”Charles M. Schulz, Home  |   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. Since 2009 Tom Lutzenberger has written for various websites, covering topics ranging from finance to automotive history. 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). This makes diagnosing the throttle body … Connect PicoScope Channel A. to the throttle position sensor signal circuit. 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. Turn the car off again, and interpret the codes sent to the scanner. It's such an expensive part, I would like to make sure I … The check engine light itself being on is not a bad thing. Measure the voltage on the throttle position sensor. The check engine light itself being on is not a bad thing. 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. This tutorial will explain how to test the electronic throttle body on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy. This tutorial will explain how to test the electronic throttle body on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy. We'll also test the throttle actuator motor. This is the throttle body. Plug in your OBD-II scanner to the connection. At this point I usually get a reading of about 2.5 K Ohms from a good TPS 1. Plug in your OBD-II scanner to the connection. This material may not be reproduced without the author’s consent. Reach underneath the steering wheel, and open up the OBD connection panel. A malfunctioning throttle position sensor will relay bad data to your car's computer and usually result in poor fuel economy. © 2011-2020 Abraham Torres-Arredondo Accelerator Pedal Release Position Learning Procedure. In this section, we'll focus on the Electronic Throttle Body. … At this point I have gotten about 3 K Ohms from a good TPS 1. 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 check light engine light will be lit up by one of the following trouble codes: Your Chevy TrailBlazer or GMC Envoy will run in. Have the mechanic clean the throttle body to remove all burned carbon residue and dirt in the assembly. 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 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 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. Testing and troubleshooting the throttle position sensor (TPS) on your Ford or Lincoln car, pick up or SUV is an easy thing to do. Electronic Throttle Wiring Test goes into details on testing and operation on electronic throttle systems. Testing the throttle position sensors within the electronic throttle body simply involves testing the resistance between two terminals. 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). After connecting everything, start your engine and test for the new throttle body; Throttle Body Replacement Cost. Allow the scanner to read the car computer and confirm whether the problem lies with the throttle body sensor. TEST 1: Testing The Throttle Position Sensor Voltage Signal. The trouble codes that are stored in the computer can tell a lot about what is actually going on. The engine starts and runs but when you try to accelerate your Chevy TrailBlazer or GMC Envoy, it accelerates very slowly. Connect PicoScope Channel B. to the throttle motor switched earth circuit. As you have probably already observed, there are 8 wires sticking out of the Electronic Throttle Body. You'll be able to find out if TPS 1 or TPS 2 is defective or not. Both of these terminals belong to TPS 1 circuit within the electronic throttle body. So far so good. Resist the urge to press on the gas when it begins to buck and fail. The engine starts and runs but the engine does not accelerate when you step on the accelerator pedal. Terminal G is the terminal that receives 5 Volts from the fuel injection computer. You'll be able to find out if TPS 1 or TPS 2 is defective or not. Jeep  |   In a nutshell, this is how the TPS works: The throttle plate angle voltage signal increases as the throttle … Disclaimer. For our first test we're going to test the resistance of terminal C and terminal G of TPS 1. Put your car keys back in the car ignition, and turn it to the "On" position. Turn off the car when the "Check Engine" light comes on if it happens before the car dies. Chrysler  |   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. The check engine light is one of the most common symptoms of a bad throttle body in your F150. 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. If using a scan tool you can read TPS, if not measure the voltage. Follow the fuel line to the housing mounted over the block of the engine. 4 If it detects a problem with the throttle body, it will turn on the check engine light. 2. Turn on the car, and let it warm up. The throttle body itself is a tubular component of an air intake system which responds to the pressing of the gas pedal. Pick up the car again, and confirm it idles correctly. Allow the scanner to read the car computer and confirm … 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. Poor-quality gas will contribute to a dirty throttle body. Start the engine and allow it … As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. 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). The throttle controller is controlled electrically as opposed to the older, mechanical cables that ran from the throttle pedal to the throttle body. 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 TPS is mounted on the throttle body and converts the throttle valve angle into an electrical signal. The connector on the throttle body itself has male spade terminals. 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 terminals on the electrical connector has female terminals. A Typical Throttle Body . Terminal C is the terminal that receives Ground from your Chevy Trailblazer or GMC Envoy's fuel injection computer. 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. The carbon will build up and cause problems with the throttle flap shutting correctly. For the 1991 and newer TPS test, go to: How To Test The Throttle Position Sensor (1991-1993 2.8L Chevy S10 Pick Up). 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