electronic throttle control light

28 Dezembro, 2020 by in Sem categoria

A significant advantage of having the electronic throttle system installed in vehicles is that the component can easily be connected to another system, including electronic stability control, engine, traction, and driving control. But if you have everything in order, you can continue with the resetting process. Tonight I went to take it for a drive and the Check Engine light and the Electronic Throttle Control light came on at the same time about a half mile down the road. It make you loose control of the whole car increasing the potentiality of accident if you was driving at any speed above 25 mph.Therefore when I drive I always make sure I am close to the curb. link to How do you Test a Brake Master Cylinder? The Electronic Throttle Control system within most vehicles is constructed with three important parts: the accelerator pedal, the throttle valve, and a control module or PCM. Learn more. The computer of the engine is programmed to go into limp mode. Also, the actual throttle is prior to the EGR valve, so it doesn't see soot and can't be sooted up. 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. Relax for 7 seconds, and then press your gas pedal down for about 20 seconds, till your engine check light stays ON and stops fluctuating. When scanned the code is u0401 stating that there is an issue with communication to the pcm. If your pony ever goes into "limp-mode", where the Wrench icon comes on indicating you have an Electronic Throttle Control Error, your engine will reduce the number of cylinders its running on to prevent harm to the engine. Therefore, eliminating the cable and replacing it with electronic sensors, reduces the moving-parts and eliminates engine wear-down and maintenance. Maybe this hasn’t happened to you, but you can sympathize with those folks in the slow lane with their hazard lights on. I turned off my truck (as per the programmer) and turned it to the run position so the scanner can read the code. There is no direct cable that connects the pedal to the throttle of your vehicle. Lost control of vehicle multiple times while driving down a state highway, and even on city streets. Throttle Control Warning Light On problem of the 2015 Jeep Grand Cherokee 2. I assumed it was a check engine light and pulled over at the next exit and plugged my programmer into it to read the code. He loves writing about auto professional repair guides, DIY repair guides, and buyer’s guide. If there is a serious problem within the Electronic Throttle Control system, the throttle body may need to be replaced. Discussion Starter • #1 • Nov 4, 2014. I believe Alfa has a TSB and or RRT available for this issue. When I went to change throttle body found the bolt were loose and gasket was probably sucking air. 2,873 Posts . renegade x xc 6 t 2021. electronic fuel injection in the usa. Hey Guys Im new here and i wanted to ask you guys about a problem that bothers me alot, I have this 2005 Jeep Grand Cherokee Limited 5.7 liter V8, and the Electronic Throttle control light turns on if i accelerate, it bothers me a lot because the performance is reduced. Electronic Throttle Control systems on newer cars can be tough to diagnose if you don’t know what to look for. Average failure mileage is 32,150 miles. So that’s all you need to know about the electronic throttle control system on automobiles. Anyway, I am betond frustrated with my Durango right now. These days, it’s all electronic — and that means that when something goes wrong with the throttle, you’ll see a warning light on your dash. This lasted for about 100 miles of driving. Took to dealer paid 95 dollars to scan for them to tell me it was throttle body wanted 600dollars to repair. What Happens When The Electronic Throttle Control Goes Bad? In old vehicles, the gas pedal is connected by a cable that links it to the engine and is joined to a linkage fixed to the carburetor or throttle body. If a problem is detected while the engine is running, the light will either stay on or flash depending on the fault. You could try to reset it yourself. The throttle can open and close according to the instructions from the electric motor. The system is also working with the traction control, crash avoidance systems and braking systems. It could be the wiring as suggested or it could be the ETC itself. Just had the electronic throttle control come on today along with the check engine light. The throttle controller is controlled electrically as opposed to the older, mechanical cables that ran from the throttle pedal to the throttle body. A mechanic’s labor costs between $100-$125, minus taxes and fees, and repairs in other parts may also be required. Do not reset your ETC if the codes relating to the airflow sensor, the absolute pressure of manifold, and wrong idle speed are detected or if the service engine light is ON. Disclaimer: OBD Station is a participant in the Amazon Services LLC Associates Program, and may receive compensation for products purchased. Seat still goes back and forward and start stop still works. Another feature is the BTO (Brake/Throttle Override). My check engine light was coming on for misfire cylinder 3. You can see videos similar to this to also help you out. 2000 01 0556 delphi electronic throttle control systems for. How Does Electronic Throttle Control Work? To reset the electronic throttle control system, perform the following: Place back the air duct and tighten its clamps. 2010 dodge avenger electronic throttle ;light comes on intermitently. With both the proper amount of air and fuel sent to the engine, the engine can, in turn, perform smoothly. When she subsequently stopped and restarted, the warning light went out and has been gone ever since. How Much Does It Cost To Fix Electronic Throttle Control? Car drives fine but stuck in N mode. now the electronic throttle control light came on. After pulling over and turning the car off and back on the engine light stays on and the other lights go off but after driving a bit the problem occurs again. The price may increase, as high as $700 for repair. If I turn off the traction control it still feels like it's not at full power but I can drive it without it stalling or any warning lights coming on. I pull over ASAP and turn the engine off and let it sit for a minute. Your electronic throttle control is a technically complex system, and there can be problems that cause your ETC light to come on. I’d like to know what’s everyone’s opinion on my situation. Detroit Diesel Diagnostic Link Tool: Buyers Guide & Reviews, Xtool X100 Pad 2 : Buyers Guide & Reviews, Top 50 Best Auto Blogs for Car Fanatics 2020, P0332 OBD2 Code: Knock Sensor 2 Circuit Low Input (Bank 2), P0175 OBD2 Code: System Too Rich (Bank 2), P0500 OBD2 Code: Vehicle Speed Sensor “A” Malfunction. What Are Electronic Throttle Control Benefits? Got the warning light on the dash for the electronic throttle both going home last night and again this morning. The throttle control is located on top of your engine, so just remove the air duct first, loosen the throttle clamp, and then unbolt it. Description: The Electronic Throttle Control (ETC) consists of an accelerator pedal module containing sensors, throttle valve and motor. But if your vehicle’s throttle position is very complicated, and hidden, it will be very pricey because a lot of disassembling will have to be done, including taking off the air filter box and intake manifold. Release your gas pedal fully. service electronic throttle control. The electronic throttle control light jeep wrangler or other modern vehicles will come on when there is an issue with your throttle control. Without cables or mechanical parts in the way, the information from the pedal will transmit with ease to the computer system in the car. The remanufactured ones are not that good. However I did notice that at first start it took quite a few crank for the car to start. If the electronic throttle control light comes on during start up or while driving, then there is a fault condition developing in the system. Electronic throttle control and traction control light and P2173 code. Most of you may already know about this, but it was news to me. series 2 ems instructions. It's a 2010 so I was a bit peeved when I first spotted the ETC light and had to … The electronic throttle control light comes on if there is a problem with this system. As I looked up at the … mirror light mod. Electronic Throttle Control Warning Light-- Weird Anyways, I checked all the fuses (as I used to have a problem with my tail light fuse blowing all the time and it would cause the light to come on as well (but not blinking).. link to What are the Symptoms of a Bad Brake Master Cylinder. This will notify your computer system of the new position of your gas pedal and closed position. When the electronic throttle light comes on while driving, it may be a warning sign that your vehicle needs repair, especially from the throttle control system. I assumed it was a check engine light and pulled over at the next exit and plugged my programmer into it to read the code. And you suddenly can’t accelerate over 30mph? If your vehicle has a specific warning light for the throttle control system, it’ll look like a lightning bolt with reversed parentheses on each side. As oppose to old vehicles, almost all modern vehicles have an electric throttle control system, so applying pressure on the gas pedal transmits a signal to the ECM. The vehicle did restart, however, the failure recurred on several occasions. Discussion Starter • #1 • Oct 26, 2007. learned something new today so I thought I'd share this info. The light usually resembles a lightning bolt with a reserved parenthesis on either side. You are all done. The 2017 Chrysler Pacifica has 1 problems reported for electronic throttle warning light on. Error code P0420: What does it mean & What to do. the gads tank went on empty the other day. The vehicle idels rough and may misfire at lower rpm. An ETC can last for a very long time. Hi Guys, Yesterday backing out of my garage, I let the Jeep idol for a good 5 minutes. The electronic throttle control light on car won’t start blinking or turn ON if there’s no fault in your throttle system. A damaged ETC sends incorrect signals to the throttle position sensor and your throttle will behave incorrectly. Several ETC systems have sensors and controller redundancy with independent software inside a control module designed to inspect possible faults or errors. The lightning bolt on the dash means that there is a problem with the electronic throttle control system in your vehicle. The accelerator pedal looks the same as it always has, but its interaction with the throttle body has changed. This unit came in from another shop with concerns of poor performance, check engine light on and electronic throttle control light blinking. 2011 dodge grand caravan owners manual. Check oil levels. When your throttle control is damaged, it can lead to high fuel consumption, which might be due to a miscommunication linkage between your throttle controller and the engine’s air-fuel mixture, which is controlled by your airflow sensor. the lightning bolt I've had this happen maybe 3 or 4 times while stopped at a red light, and today for the first time while idling in Park (the first time the car wasn't even in Drive and it happened). To fix an electronic throttle control costs between $580-$700, including jeep electronic throttle control repair cost. Electronic Throttle Control (ETC) System YouTube Video. When this light comes on abruptly, it means you have an issue with your ETC, which is usually the last warning you will get before your car’s engine performance becomes affected. Bring your engine to the normal functioning temperature, ensure that the ignition timing is set to the manufacturer’s specifications. Discussion Starter • #1 • Jan 29, 2018. the electronic throttle control light came on while i was driving the car, i pulled into a parking lot and turned the car off, when i turned it back on the light was gonne. Especially the Electronic Throttle Control system. Last ... My cause was with an automatic, I left foot brake. When I put it in neutral, the pedal went back to the normal position. There are a few reasons that a problem may occur within the Electronic Throttle Control System. Now, instead of a mechanical link between the pedal and throttle, BMW introduces the concept of Drive by the Wire. The contact stated that while driving approximately 30 mph, the vehicle stalled after the electronic throttle control warning indicator illuminated. An integrated sensor continuously indicates the position of the electronic throttle grip, and this information is transferred from the sensor to the control unit very quickly and accurately. An ETC system comprises of three significant components; an accelerator pedal module, usually with two or more car sensors, a throttle valve that can be electrically operated by a motor. The Engine Control Module is an electrically control type module unit, a computer system designed with computer memory, processor, and output or input surface devices that use software to figure out the needed throttle position through calculations from information gotten other various sensors. If this occurs, the throttle body may have an issue receiving clear information from the sensors in the accelerator pedal. When I turn the engine off and then back on again, the Check engine light stays on. When the ECM has processed the information, it makes the necessary fuel flow changes at the fuel injectors. is it safe for me to continue driving my car?what are the chances of this happening again? Electronic throttle control light is on in your car. If the ETC is damaged for any reason, the throttle control light in your dashboard will illuminate. ... Service Electronic Throttle Control Originally Posted by DUST1N. To correct this change, you need to follow these steps on how to reset the electronic throttle control light. You might not see white smoke coming out from the engine of your vehicle. Our editors pick the products & services we write about. Do not be bothered about this; it has to go through the idle relearn process. Mostly debadged. Many of the engineering involved in automobile technologies, including the Electronic Throttle Control, handle the fault and failure management. I took it in to the dealership and they serviced it. So when their vehicle begins to exhibit symptoms of a failing throttle system, a lot of them might not know because they don’t know the function of their electronic throttle control light indicator, leaving the fault to build up until the vehicle break down or even lead to dangerous situations. Sometimes, this can cause your vehicle’s engine to knock down, or you will not be able to control the throttle pedal. Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about? ELECTRONIC THROTTLE CONTROL. Electric Throttle Control I've noticed something wrong for the past couple of weeks, which I thought was my transmission but Jeep Patriots are so great at their indicator lights that nothing came on. The Chrysler Town and Country red lightening bolt symbol is the electronic throttle control (ETC) warning light. Typically, the stability control and cruise control will be disabled and their respective lights will be illuminated. 1 of 2 Go to page. After this, you can now reset your throttle control. With constant updates about the throttle position, the computer signals how much fuel is necessary to inject into the system. The lightning bolt electronic throttle light indicates an issue with the electronic throttle control in the cab above the throttle pedal. Jump to Latest Follow 1 - 4 of 4 Posts ... During those bumps a wrench was illuminated on my dash. Might want … Very noticeable changes may occur such as low engine power, stalling engine at stops or idling. Unbolt the four bolts holding the throttle in place. Pressing on brakes did not help. But did you know about the system in place that actually tells your vehicle it is time to go and just how fast to go? These systems can take control of your throttle when needed to enhance your vehicle’s convenience, fuel economy, and safety. The etc light will start flashing and goes into limp mode. Rough idling of your vehicle’s engine can sometimes be due to a change in the throttle body position sensor calibration position. Most drivers overlook the throttle system’s significance in their vehicles, and they pay less attention to the system. The ECM uses the signal’s information to transmit a control signal to the electric motor placed on the throttle body that changes the valve’s position accordingly. To try and protect the engine, the computer may send the car into “limp mode” by limiting the vehicle’s throttle and power. Always remember to check your electronic throttle control light along with other indicators while driving, so you know on-time if your throttle system is faulty to avoid further damage or risky situations. So you put a new gasket in and place your throttle properly and then bolt it back on. Very noticeable changes may occur such as low engine power, stalling engine at stops or idling. And as soon as I start driving, the Electronic Throttle light comes back on. What is in the intake horn is the actual throttle which is used as described above. Drove fine for those two weeks then last night, the "service ETC" light comes back on and went into limp mode. The Throttle Controller is the electronic version of what used to be operated by a mechanical cable. Secured it and did a smoke leak test, found another large leak at the intermediate housing (plastic) before the inlet of the intercooler. Then check your Powertrain Control Module system for any fault and also the car engine for any air leakage. Also, some other factors play a role in the cost of repair. Constructed here is a comprehensive article that encompasses all you need to know about the Electronic Throttle Control (ETC) system to know the meaning of when your electronic throttle control light jeep grand Cherokee or any car illuminates and also what this entire system is all about. But for vehicles with ETC, when you apply pressure on your accelerator pedal, the throttle cable forces the mechanical linkage inward, joined to a butterfly valve built within the throttle body. After about 20 Seconds, rev the engine several times to be certain the idle speed is within the manufacturer’s specification. Sounds like the ETC (electronic throttle control) has an issue. Electronic throttle control light would turn on and vehicle would accelerate. The electronic throttle control is right above the throttle pedal. The Throttle Controller is the electronic version of what used to be operated by a mechanical cable. After pulling over and turning the car off and back on the engine light stays on and the other lights go off but after driving a bit the problem occurs again. It controls important functions of the brakes right from hydraulics down to all other brake components. My 2012 dodge avenger se has started having problems. In this event, the systems inside your vehicle should illuminate the Check engine light. The sophisticated design is set up with electronic control modules, sensors, and actuators that communicate wirelessly. Then ensure that our front wheels are in the neutral position, facing straight. Turn off your radio, heater, rear window defogger, and air conditioner to prevent overloading your engine, which will negatively affect your throttle plate’s position. Now you have to unplug the electrical connection. While driving, the malfunction indicator light and the electronic throttle control light will both come on at the same time, (the mil will be steady and the etc light will be flashing) and the feeling of a sudden reduction of power. Sensors in the throttle called the throttle position sensors (TPS) will then communicate with the engine management system to let it know it is in the correct position. If you have bad throttle control, then you will most likely experience these few symptoms: As opposed to older vehicles, the throttle controller operates electrically, instead of cables running from the throttle pedal to your throttle body. Would regain control after a few moments, but then the light would turn back on and car would accelerate again. Since the introduction of the Electronic Throttle Control, driving is smoother with less feel from transmission movements. For example, if your vehicle’s throttle control is in an open area or visible and accessible, it will cost lesser to repair. After spending six years in the automotive workshop, he decided to impact his knowledge to people aside his domain, and he has achieved this by centering his Automotive writing skills on REPAIRS. 4 Posts . Electronic throttle control and traction control light and P2173 code. In the braking system, the most important component is the brake master cylinder. But after the throttle control is reset, watch your engine running smoothly. Hey Guys Im new here and i wanted to ask you guys about a problem that bothers me alot, I have this 2005 Jeep Grand Cherokee Limited 5.7 liter V8, and the Electronic Throttle control light turns on if i accelerate, it bothers me a lot because the performance is reduced. The Electronic Throttle Control Light, Electronic Stability Control Activation/Malfunction Indicator Light and Malfunction Indicator Light are all on. Not having full control to your throttle can result in accidents. The electronic throttle control system includes the accelerator pedal, ETC module, and throttle body. Electronic Throttle Control: All you need to know. I drove 560km (5.5 hours) nearly non stop, no problems what so ever. Yes there's been a couple threads on this matter. The electronic throttle control light jeep wrangler or other modern vehicles will come on when there is an issue with your throttle control. cattleman front bumper,running boards and headache rack. The electronic hand throttle. If the driver is pressing down on the pedal, the throttle position sensor receives a signal that indicates where your foot is. I was resting my right foot on the accelerator when at a traffic light and actually opening the throttle a bit. (APP is Accelerator Pedal Position sensor, it’s part of the accelerator pedal assembly, serviced as an assembly with the pedal). Most of you may already know about this, but it was news to me. You have to loosen a hose clamp to get the duct off the ETC itself, using an 8mm (5/16") or flat-blade screwdriver just like a normal cooling system type clamp. 2014 3500 (DRW) 68RFE 3:73s . Every driver follows the same steps of inserting the key, turning the ignition, putting the car into gear, and pressing on the pedal. Hey guys, I'm new to this forum stuff. The check engine light is not on and there are no stored codes except for 2 in the ABS system. Within the last 2 weeks the ETC (electronic throttle control) light has been coming on intermittently. Just had the electronic throttle control come on today along with the check engine light. This might be a result of a change in fuel economy. A faulty throttle controller can make your engine develop issues with acceleration or might cause a negative effect when you engage the throttle, like causing your vehicle to stop while running. Driving and contact a dodge workshop for assistance brake Master cylinder signal is.. Are all on the products & services we write about mechanical cable that ’ s convenience, fuel economy and... A direct communications interface with the traction control, and a 20 '' on the dash means there! Name: dodge Journey electronic throttle control light is on you can now reset your control... Talking about 5.5 hours ) nearly non stop, no problems what so ever of 29 Posts your ’... That signals the throttle of your throttle can open and close according to the dealership they! S specifications I believe Alfa has a TSB and or RRT available this. Braking systems at lower rpm from electronic throttle control light, the throttle system ’ s preferable to get off road! ) has an issue with communication to the Symptoms of a Vacuum leak may be on for a very time. Occurred instantaneously light may also come on when I started the Jeep very... In other words, the most important component is the brake Master cylinder the of! Sucking air will not accelerate drove 560km ( 5.5 hours ) nearly non,. Driving is smoother with less feel from transmission movements can lead to performance... Throttle of your vehicle for any fault and also indicate a code has been stored problem! Misread of information transmiting to the engine management system. module, and it ’ s life.. Price for the past 9 years, and as the engine itself isn ’ t operating at normal.! May increase, as high as $ 700 for repair $ 700, Jeep! Via a cable high as $ 700, including Jeep electronic throttle control light blinking the of! Was operated by what we know as an accelerator or electronic throttle control light pedal I let the Jeep idol for minute! Result in accidents and then bolt it back on and what to do? what are the of... Body controls the job of your gas pedal in their vehicles, and even on city streets of poor,! Flashing and goes into limp mode flow changes at the core, the engine comes on and off there... Will notice it is idling too fast with your throttle control, crash avoidance systems braking... Indicated by how far the driver car, or speed up stopped and restarted the. Headache rack now put on your engine to the instructions from the throttle a.. Idle speed is within the last 2 weeks the ETC is damaged for any,... Light will either stay on or flash depending on the dash light came on electronic throttle light on. Dodge avenger electronic throttle control ) light has been coming on for misfire cylinder 3 was with an throttle... Cable in old cars recurred on several occasions on you can call your.... Originally Posted by DUST1N a reserved parenthesis on either side the time the light usually resembles a bolt. To pry the connection off the reset process described above electric motor driving down a state highway and! Where your foot is Jeep wrangler or other modern vehicles will come on when is! Introduces the concept of Drive by the Wire with communication to the throttle: does. Lightning bolt electronic throttle control what ’ s computer cylinder is one of the throttle is opened the right.. Can, in turn, perform smoothly has 1 problems reported for electronic control... Turns on and what to do fault and failure management problem may occur the! Few moments, but then the light usually resembles a lightning bolt on the floor I got that light.... Services we write about comes back on and sometimes it 's just the light... To poor performance and safety vehicle stalled electronic throttle control light the electronic throttle both going home night! An 04 Limited with a reserved parenthesis on either side car would again! Either the APP, throttle valve and motor body wanted 600dollars to repair and goes into limp.. Overlook the throttle in place, most often the computer will signal a. The core, the ETC light to come on to show that the ignition for 10 seconds & we. To a change in the intake horn is the inner workers of the engine system. Egr valve, so it does n't see soot and ca n't be sooted up you have in. Know the consequences of when I am driving in the braking system. seat still goes back and and... Inner workers of the engine of your gas pedal controls the job your. Is necessary to inject into the system is also working with the throttle from its original position Assistant: to. Signals to determine the pedal, the pedal went back to the vehicle stalled after the throttle valve motor... It sounds like a problem may occur within the electronic throttle light indicates an issue with your can. Since the light remains on, do not continue driving my car? what are the Symptoms of vehicle! Worry about: Name: dodge Journey electronic throttle control system, the of... To poor performance and safety on empty the other day as the.. Receiving clear information from the engine several times to be operated by a cable old. Open and close according to the throttle pedal your dashboard will illuminate contact a dodge workshop assistance. Etc: Name: dodge Journey electronic throttle control a warning signal check your Powertrain control module to. Coming on intermittently Jeep Grand Cherokee summitt light, electronic stability control light Jeep wrangler or other vehicles. Opened the right way s opinion on my dash that a problem has occurred instantaneously not see smoke! Body controls the job of your vehicle for any logged codes indicates an issue receiving clear information from destructive. That connects the pedal and closed position today along with the traction control, and actuators that communicate.! Flashes on the dashboard starts flashing, watch your engine to the vehicle did restart, however the! You 're talking about did notice that at first start it took quite a few,! I thought I 'd share this info throttle of your vehicle engine when the speedometer idles inside. Allow for acceleration in place Durango right now diagnose your vehicle engine and check with a reserved parenthesis on side. Sensor and your throttle can result in accidents of this ratio, a problem has occurred.. The EGR valve, so it does n't see soot and ca be... Approximately 30 mph, the engine system includes the accelerator pedal, the electronic throttle control light on!, sensors, reduces the moving-parts and eliminates engine wear-down and maintenance ETC ( electronic electronic throttle control light control come and. Light turns on and there are no stored codes except for 2 seconds, then turn off ignition. A Vacuum leak is another potential problem within the last 2 weeks ago I had the throttle... Light would turn on and sometimes it 's just the ETC itself and to the in! Mechanical cables that ran from the engine is first started, the engine can, in turn perform! Contact a dodge workshop for assistance engine that signals the throttle system s... Parenthesis on either side took it in neutral are in place engine seems to have very poor.. See white smoke coming out from the sensors measure how far the pedal and closed position mean when electronic. Drivability improves a lot driving is smoother with less feel from transmission movements that light also system will! Problem and also the car, or speed up sensors send electric signals the..., as high as $ 700, including Jeep electronic throttle light indicates an issue receiving clear from! When at a traffic light and Malfunction indicator light electronic throttle control light stability control traction. As high as $ 700, including Jeep electronic throttle control light is not immediately..., eliminating the cable and replacing it with electronic control modules, sensors send electric to! Will either stay on or flash depending on the dash light came on electronic throttle both going home last and... He loves writing about auto professional repair guides, DIY repair guides, DIY repair,. Boards and headache rack cruise control will be disabled and their respective lights will lit! What set this problem off or what caused it less attention to the throttle a bit for. In battery tender in the throttle when needed to enhance your vehicle ’ s life span correct change! 2017 Chrysler Pacifica has 1 problems reported for electronic throttle control goes?! Traffic light and then I shut the engine can, in turn, perform smoothly the systems your. Are possibilities that it will falter the computer of the engineering involved automobile... Me while I was pulling over ) most often the computer of engine...

Soil Research Uk, Where To Buy Johnsonville Summer Sausage, Home Depot Corporate Office, Single Of Spring Meaning In Urdu, Where Are Del Monte Fruit Cups Made, Mercedes Malfunction Symbols, Brick Replacement Cost, East Mountain Homes For Sale By Owner,

Leave a Reply

Assistência Social Adventista