i'm so doing it. P0121:: Throttle Position Sensor Performance. witch in turn makes me again belive a bad tps. i suspect it to be the tps sensor. If your car is giving you trouble and you notice that it accelerates slowly or if it just seems a little sluggish. So long as you accelerate the bike would pull perfectly, but once you keep the throttle at a fixed position the stutter will start. For some reason the bike doesn't accelerate as smooth and hesitates as well as idles rough. so i'm trying to test and adjust my tps on my 2009 yfz450r. or you can take paper clips and slide them in the harness just make sure they don't hit each other or the frame, You don't need a test harness you can take safety pins and slid in the back of the connector and get a reading. yfzcentral.com is not in any way affiliated with Yamaha Motor Company, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If so is it very noticable. With no other 450-class quad . Contact your dependable technician right away if you see your car jerking or bucking. If you observe that the engine speed or RPM fluctuates, indicating unpredictable idling, you likely have a bad throttle body. Come join the discussion about performance, modifications, troubleshooting, maintenance, classifieds, and more! Gently loosen them so you may remove them. I need to know what electronics are involved in the electrical system of the yfz. Once it gets defective, the bike will start to stall, usually when pulling the clutch to start driving, and once the problem gets worst, it will stall even while driving.So what can you do?First of all, click on the following link, it will determine if your bike is within the brands recall - http://www.vosa.gov.uk/vosa/apps/recalls/default.aspSecondly, give our blog post a look, there we show some pictures that might help you compare the old and the new models of TPS :)Blog post - https://www.tea2wine.com/single-post/2018/04/21/Yamaha-TPS---Throttle-Position-Sensor----------------------------------If you like our content and you want to help, our eternal gratitude is yours!https://www.patreon.com/tea2wine----------------------------------Like my content? It could not close correctly, which could result in serious issues. This will cause it not to slide all the way down. The Fora platform includes forum software by XenForo. Your check engine light may be caused by a malfunctioning TP sensor. I have my head lights removed and when I get to my higher rpms the bike starts 2 sputter.. im assuming it has something to do with my stator. its listed as the vaccum control knobnot the choketps was never taken off moved or adjusted either. If this information is faulty, there might also be a problem with your automatic transmissions shiftings. This Bypass plug works on stock and aftermarket CDI boxes. can anybody verify if i'm doing it right? A bad throttle position sensor can lead to incorrect shifting in an automatic gearbox by preventing enough speed changes. the knob turns 4 or 5 full revolutions to the right and left side if sitting on the atv. https://www.thumpertalk.com/forum/showthread.php?t=696672. this is what i get when i check my tps. Out for 2011can't wait to get back at it in 2012!!! For a better experience, please enable JavaScript in your browser before proceeding. Female OBD-II connector on a car by M.Minderhoud / CC BY-SA 3.0. when i had mine on the dyno i unplugged it and it didnt make a difference. If you have an electric throttle body, one of the most dangerous effects of a defective throttle position sensor is a sudden increase in speed while driving at high speed on a highway. To find out whether your throttle position sensor is broken, just keep reading. The labor costs are usually between $50 and $200 at a workshop. Read on. bluetraxx.com is an independent Yamaha enthusiast website owned and operated by VerticalScope Inc. You can check it with an OBD2 scanner. i will look over the proper yamaha manual and see if this helps and can narrow it down..thanks. The Fora platform includes forum software by XenForo. The latest 2020 Yamaha YFZ450R retails for $9099 MSRP ($9499 for SE model). any help would be great. where can i buy this test harness? Come join the discussion about performance, modifications, troubleshooting, maintenance, classifieds, and more! with the bike off it read 12.8. then i started the bike and brought the rpms up wit the tester on and the meter read 14.6 them the bike began 2 pop. Poor Fuel Economy #5. The best course of action is to take your vehicle to a trained technician who can inspect it and install the necessary replacement part. The throttle position sensor is most likely visible if there are cables leading to it in the same direction as the throttle body axle. The Throttle Position Sensor (TPS) is an integral part of the vehicles fuel management system as it determines the angle of the throttle body flap. This is a potentially hazardous condition and needs to be diagnosed right away. If you have an idle that will hold for a bit, then drops off and dies, and if set higher, never drops off, that's a "hanging idle", and it's generally the result of a lean condition, which can be caused by improper idle circuit adjustment, contaminated jets, air leaks, or tight intake valves. coming out of the sensor i get half the voltage manual says i need. http://www.bluetraxx.com/forums/yampresent/72484-bog-zip-tie-o-ring-mod-you.html, Yamaha YFM350 Raptor/Warrior ('87-Present). As a result, the throttle valve may not be fully opened by the ECU, prohibiting the car from going beyond a certain speed limit. Content on yfzcentral.com is generated by its users. You need to use the DCV 2000m or 20. Difficulty Shifting Gears #7. OK, do you use a special TPS Bypass unit? The throttle position sensor (TPS) is one of the thousands of system parts that work in harmony to ensure that your car engine performs at the best it should, and it is also one of the parts that is frequently disregarded. I got one with my motion pro twister and its just a jumper wire. By pushing the tab on it and wriggling it off, you may remove it with ease. I did do some back probing in the sensor and am only pulling half of the voltage that should be coming outta the tps. if i hold the throttle a lil bit it"ll run but if its decelerating and pull in clutch it dies also, must dump clutch to get it running again. The most frequent time it happens is when youre driving and you dont touch the gas pedal. The TPS sensor is adjusted via the allen head screws on the side of the unit. 2000m is 2 DC volts and below, it would be more accurate for the low voltage tps setting. Because if your throttle position sensor malfunctions, your vehicle will enter a safe mode that restricts rapid acceleration and speed and causes an engine power loss. so i then just unplugged it. While you press the accelerator pedal or when the engine is idle, it wont move. All the bypass does is cause the CDI to read the throttle opening position at either 0% or 100%. it can be put in upside down, with the results like your describing. I had to just stick the torq bit in there and use a damn open end wrench to twist, which sucked too cause I didnt have any down pressure on the bolt head. A throttle position sensors job is to monitor how much air and fuel your cars engine needs to operate at peak efficiency. The throttle position determines how much air enters the intake manifold of an engine; when it is wide open, more air enters; when it is virtually closed, less air enters. The TPS may go into full or partial collapse. As an Amazon Associate we earn from qualifying purchases. Some modern cars feature a special limp mode that enables them to run at a very low speed when the engine fails. A malfunctioning throttle position sensor might either leave you stranded on the side of the road or cause your car to accelerate erratically, depending on whats wrong. Come join the discussion about performance, modifications, classifieds, racing, maintenance, and more! :nod: You can run the bike with out the TORS, that's not an issue. did you take the slide out? What happens is that the throttle in the throttle valve may close automatically, and if the driver presses the accelerator pedal too hard, the valve suddenly opens and gives the car a small speed boost. Some say they have cured the problem with a vortex ignition. This is crucial because it reduces your chance of electrical shock and prevents your Engine Control Module from displaying an error signal. sat overnight, checked basic..had full gas. The throttle position sensor is a very vital part of the car engine. The Sparks TPS plug solves all of these problems. the only way i see how is using a test harness like the manual says. A faulty TP sensor can be the cause of your check engine light. He didn't realize this and tried running the bike but it would not idle. small price to pay, 20 bucks i figured it was worth it. However, certain cars make it challenging to get at the component. Check Engine Light Illuminated #3. how i knew that it wsa the recifier/regulator.. i took a voltage tester to my bike. For anyone thinking of attempting to do this, save yourselves a lot of frustration and mark the sensor and the carb with a precise notch for the factory setting. But other problems might also be indicated by this warning light. Poor fuel economy can be a sign of many problems, like dirty fuel injectors or faulty spark plugs, so its best to get your car checked out by a professional to identify the source of the issue. The location of the throttle and how rapidly it opens and closes are relayed to the engine control module, and the computer utilizes this information, among other things, to determine the timing of the spark plugs and the amount of gasoline pumped into the engine. faulty TP sensor can be the cause of your check engine light. Jerking or bucking of the vehicle is the most common symptom of a bad TPS. Knob? And you must be able to put the ohm meter in both of the correct positions to even get a true measurement that is right and not false..and 7 out 10 tries gives different ohm levels.sounds like fun yet? There for being able to adjust timing in accordance with RPM/throttle position is a good thing. Not so here. This article will discuss some of the most common symptoms when the throttle position sensor is damaged or faulty and the cost of replacing it if your throttle position sensor is bad. A throttle position sensor costs $30 to $100. Symptoms Of A Bad Throttle Position Sensor #1. it all has to do with ignition timing and it's relationship to compression. Contact MikePeavler he might give you some pointers.