As you're probably already aware, the electronic throttle body is made up of three components. Put your car keys back in the car ignition, and turn it to the "On" position. 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. If there's an open-circuit problem between them you're not going to see continuity at all on your multimeter. Start the engine and allow it … 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 malfunctioning throttle position sensor will relay bad data to your car's computer and usually result in poor fuel economy. Chrysler  |   Terminal G is the terminal that receives 5 Volts from the fuel injection computer. After connecting everything, start your engine and test for the new throttle body; Throttle Body Replacement Cost. 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. The trouble codes that are stored in the computer can tell a lot about what is actually going on. Honda  |   The device attached to the throttle body with the wires running to the engine control unit --- ECU --- is the throttle position sensor. 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. A Typical Throttle Body . If your vehicle is having engine issues, it can be difficult to find the culprit. The carbon will build up and cause problems with the throttle flap shutting correctly. This is the throttle body. Measure the voltage on the throttle position sensor. 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. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. The parts itself cost between $430 and $550, while the labour cost is around $50 and $160. Have the mechanic clean the throttle body to remove all burned carbon residue and dirt in the assembly. In a nutshell, this is how the TPS works: The throttle plate angle voltage signal increases as the throttle … If using a scan tool you can read TPS, if not measure the voltage. © 2011-2020 Abraham Torres-Arredondo In this section, we'll focus on the Electronic Throttle Body. Stop the car, and let it idle. The average replacement cost of the throttle body is between $480 and $710. CASE 1: The multimeter registered continuity between terminals C and G. This is the correct test result. 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. 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. Many car makers including GM started installing fly by wire electronic throttle bodies. Throttle Actuator Control (TAC) module. Since 2009 Tom Lutzenberger has written for various websites, covering topics ranging from finance to automotive history. For our first test we're going to test the resistance of terminal C and terminal G of TPS 1. Reach underneath the steering wheel, and open up the OBD connection panel. Turn off the car when the "Check Engine" light comes on if it happens before the car dies. 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). Do NOT follow this link or you will be banned from the site! Is it possible the Throttle Body could be causing the other two be intermittent? The terminals on the electrical connector has female terminals. Drive it around a bit so the engine is warm. You don't even need a scan tool to test it. I thought I did once, but I was wrong.”Charles M. Schulz, Home  |   … This tutorial will explain how to test the electronic throttle body on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy. When a throttle body is not functioning correctly, some noticeable characteristics … 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). So key on, engine off with throttle fully closed on sensor one should be about half a volt to 1.2 volts. Allow the car idle to level out to its lowest state. If it doesn't, they'll find you the right one. Ford  |   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. A bad throttle can cause the mass air flow sensor and O2 sensors to trigger as well when the air-fuel mixture goes awry. Throttle body. This tutorial will explain how to test the electronic throttle body on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy. 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. Pick up the car again, and confirm it idles correctly. 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. Testing the vehicle to find this problem requires a few tests and computer readings. Here's a summary of the 3 tests in this tutorial: Check the … Disconnect the throttle body from its electrical connector. 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. You may need to run the scanner test more than once. The throttle position sensors within the throttle body are tasked with informing the fuel injection computer of the throttle plate angle. • switch off AC and emission controls at Wide Open Throttle (WOT). Accelerator Pedal Release Position Learning Procedure. Make sure that the accelerator pedal is fully released. All of the tests in this tutorial are done on the connector of the throttle body itself and this connector has male spade terminals. The largest component of the throttle body, which regulates the airflow, is the throttle plate. Lower the idle if necessary by manually adjusting the throttle cable if your car has one. You'll be able to find out if TPS 1 or TPS 2 is defective or not. Terminal C is the terminal that receives 5 Volts … Terms of Use Full open should be about 3.2 to 4.9 and I'm getting 4.07 so that's pretty good. 4 As the throttle opens, the signal voltage increases. TEST 1: Testing The Throttle Position Sensor Voltage Signal. At this point I have gotten about 3 K Ohms from a good TPS 1. It consists of mechanical parts which may become worn and require replacement. Lutzenberger works in public finance and policy and consults on a variety of analytical services. So far so good. 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