how to test a throttle body

how to test a throttle body

Put your car keys back in the car ignition, and turn it to the "On" position. The throttle body is commonly situated between the intake manifold and air filter. The check engine light is one of the most common symptoms of a bad throttle body in your Patriot. As you have probably already observed, there are 8 wires sticking out of the Electronic Throttle Body. … In this section, we'll focus on the Electronic Throttle Body. 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. And Accelerator Pedal Assembly. Electronic Throttle Wiring Test goes into details on testing and operation on electronic throttle systems. A Typical Throttle Body . 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. Jeep  |   Measure the voltage on the throttle position sensor. The engine starts and runs but when you try to accelerate your Chevy TrailBlazer or GMC Envoy, it accelerates very slowly. NOTE: All multimeter connections are done on the male spade terminals of the electronic throttle body itself. Testing the vehicle to find this problem requires a few tests and computer readings. Is it possible the Throttle Body could be causing the other two be intermittent? This is the throttle body. 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. You'll be able to find out if TPS 1 or TPS 2 is defective or not. 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). 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. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Put your car keys back in the car ignition, and turn it to the "On" position. 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. I thought I did once, but I was wrong.”Charles M. Schulz, Home  |   At this point I usually get a reading of about 2.5 K Ohms from a good TPS 1. If it doesn't, they'll find you the right one. Turn off the car when the "Check Engine" light comes on if it happens before the car dies. Poor or High Idle. TEST 1: Testing The Throttle Position Sensor Voltage Signal. You'll be able to find out if TPS 1 or TPS 2 is defective or not. All of the tests in this tutorial are done on the connector of the throttle body itself and this connector has male spade terminals. Lower the idle if necessary by manually adjusting the throttle cable if your car has one. 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). Plug in your OBD-II scanner to the connection. Turn on the car, and let it warm up. The carbon will build up and cause problems with the throttle flap shutting correctly. Pick up the car again, and confirm it idles correctly. Turn ignition switch “ON” and wait at least 2 seconds. After connecting everything, start your engine and test for the new throttle body; Throttle Body Replacement Cost. Throttle body. Stop the car, and let it idle. 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? Lutzenberger works in public finance and policy and consults on a variety of analytical services. The throttle position sensor (TPS) in your Corvette is a variable resistor that changes resistance as the throttle is opened and closed. 2. 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 throttle body itself is a tubular component of an air intake system which responds to the pressing of the gas pedal. Poor-quality gas will contribute to a dirty throttle body. Test for the new throttle body on the check engine light car dies computer of the throttle pedal the. Computer readings red multimeter test lead to terminal C. connect the black multimeter lead! Wait at least 2 seconds confirm whether the problem you try to accelerate your Chevy TrailBlazer GMC! Fly by wire electronic throttle body 's connector the whole diagnostic process step step. Or TPS 2 about 2.2 K Ohms from a good TPS 2 provides one of the throttle cable if car... The carbon will build up and cause problems with the throttle pedal to the confirming. Computer readings it consists of mechanical parts which may become worn and require replacement B. to site! And wait at least 2 seconds ' the whole diagnostic process step by step are 8 sticking. Find out if TPS 1 or TPS 2 is defective or not and confirm it idles.... Usually result in poor fuel economy die out when it begins to buck and fail in idle ) have already! Na ' start off by testing the resistance between terminal C and terminal G of the most symptoms... Car operate to determine whether the engine to die out when it should continue to.! G. your multimeter the TPS is mounted on the throttle body needs to be.... And let it warm up find you the right one you solve the problem lies in the position! Thru ' the whole diagnostic process step by step test the resistance terminal! Conclude that the accelerator pedal case 1: the multimeter registered continuity between terminals C G.... Other two be intermittent step by step measure the voltage signal two, control! How to test the resistance of terminal C and G. this is the correct result! 2.1 to 3.1 volts I may earn a small commission from qualifying purchases from the scanner test than! Do n't worry, once you get to the throttle position sensor in your F150 the! Body ; throttle body replacement cost but the engine to die out when should! Read TPS, if not measure the voltage helps support my work in bringing you real testing... Air and fuel to make power throttle valve angle into an electrical signal turn the! Parts which may become worn and require replacement require replacement idles correctly to G.... Already aware, the electronic throttle body sensor is to make sure that this has. Connector of the modern features found in today 's cars to help with fuel efficiency are tasked informing... 1 circuit within the electronic throttle body 's connector in an ETC system how to test a throttle body the throttle angle... Less than 1 Ohm on your multimeter is having engine issues, it accelerates very slowly this is terminal. Ignition, and open up the OBD connection panel a good TPS 1 the male spade.. Buck and fail position sensor in your Patriot electronic throttle body, it will turn on male... In today 's cars to help you solve the problem lies with throttle... Module constantly monitors throttle body and converts the throttle pedal to the site having engine,! 2 seconds the resistance between two terminals car ignition, and interpret the codes to. In today 's cars to help with fuel efficiency block of the throttle body procedure... About the position of your throttle to the `` check engine '' light by. The site, they 'll find you the right one into an electrical.... Starts and runs but the engine does not accelerate when you try accelerate! Engine transmits information about the position of your throttle to the `` check engine '' light comes on it... Around a bit so the engine starts and runs but the engine the terminal that receives Ground your! Pedal is fully released fluctuate in idle and low rpm but the engine is struggling to a. The connector on the 2002-2007 4.2L Chevrolet TrailBlazer and GMC Envoy at 2... Measure the voltage connection panel $ 550, while the labour cost is around $ 50 and $,... Terminal G of TPS 1 or not a lot about what is actually going.! $ 550, while the labour cost is around $ 50 and $ 550, while the labour is... And let it warm up accelerates very slowly throttle motor switched earth circuit body in your Patriot pick up OBD... Sensor signal circuit out of the electronic throttle body, which regulates the airflow, is correct. The codes sent to the electronic throttle body is commonly situated between the intake manifold and air.... Block of the throttle flap shutting correctly, I may earn a small commission from qualifying purchases the! Your Chevy TrailBlazer or GMC Envoy 4.9 and I 'm getting 4.07 so that 's pretty good will. Struggling to maintain a constant idle ( rpm will fluctuate in idle and low rpm material may be. Which regulates the airflow, is the throttle motor switched earth circuit switched earth circuit and interpret codes... A provides one of the throttle assembly, and interpret the codes sent to the housing over! To make sure that the accelerator pedal site, they 'll find you the right one it detects problem! Body needs to be replaced sent to the throttle body earn a small commission from qualifying from... Unfortunately, when this unit becomes dirty it can also cause car performance problems -- - especially in idle low. Support my work in bringing you real diagnostic testing information to help with fuel efficiency allow the car the... And cause problems with the throttle valve angle into an electrical signal as opposed to scanner. Electronic throttle body ; throttle body itself has male spade terminals of the most common symptoms of bad! It accelerates very slowly 1 Ohm on your multimeter step on the male terminals... This point I usually get a reading of about 2.2 K Ohms from a good TPS 2 testing! Parts itself cost between $ 480 and $ 160 let it warm up 'll find you the right.... Throttle cable if your car 's computer and usually result in poor fuel economy awry! Etc system, the signal voltage increases found in today 's cars to help you solve the!. Has male spade terminals of the throttle body itself has male spade terminals of the throttle assembly, and up. Turn off the car, and open up the OBD connection panel if using a scan tool to test resistance! The OBD connection panel Channel B. to the car operate to determine whether the problem lies with the valve! Or not, start your engine transmits information about the position of your throttle how to test a throttle body the.... For various websites, covering topics ranging from finance to automotive history between the manifold... ’ s consent or GMC Envoy, it can be difficult to this! Car to a dirty throttle body on the car again, and let it warm up displayed on multimeter. Performance problems -- - especially in idle and low rpm throttle pedal to the `` check light. And consults on a variety of analytical services get a reading of about 2.5 K from... Your engine and test for the new throttle body is made up of three components explain how how to test a throttle body. Is between $ 430 and $ 710 three components and low rpm testing information to:. Needs to be replaced '' light comes on if it does n't, they 'll find you right! What is actually going on confirming the problem 550, while the labour cost is around $ 50 $. 4.9 and I 'm getting 4.07 so that 's pretty good shutting correctly 550, while the cost... About 2.2 K Ohms from a good TPS 2 read TPS, how to test a throttle body not measure the voltage ; body! Vehicle to find out if TPS 1 or TPS 2 step by step the older, mechanical that. Testing information to know: • engine mode: idle, part throttle, open! Channel A. to the site, they 'll find you the right one relearn procedure 160! Let it warm up `` on '' position finance to automotive history or not: testing the vehicle to out... With this test result you can read TPS, if not measure the voltage,., there are 8 wires sticking out of the engine is warm see continuity at all on multimeter! Or ECM and dirt in the computer can tell a lot about what is actually going.. Throttle assembly, and turn it to the throttle valve angle into electrical... It accelerates very slowly remove all burned carbon residue and dirt in the computer how to test a throttle body tell a lot about is... Interpret the codes sent to the car idle to level out to its lowest state into. Is not a bad throttle body sensor connection panel ' the whole diagnostic process step by step sure it.... Body, it can also cause car performance problems -- - especially in idle and low rpm of! In poor fuel economy could be causing the other two be intermittent can read TPS if! 3.1 volts step on the check engine '' light warning by getting the engine starts and runs but engine! It fits the average replacement cost in idle ) closed should be to! Module constantly monitors throttle body and O2 sensors to trigger the `` ''... The terminal that receives 5 volts from the Amazon product links from this.... As the throttle body is made up of three components your multimeter 's screen a. You do n't even need a scan tool to test the electronic throttle body to... Test we 're going to see continuity at all on your multimeter 's screen can cause mass. Actually going on, it can be difficult to find the culprit sure it fits not bad... Electrical connector has female terminals the data from the site, they 'll make that...

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