2) Remove these 3 10mm bolts and then remove the throttle body cover. Luckily these units are repairable. The most common throttle position sensor code is the P0122 – Throttle Position Sensor/Switch A Circuit Low Input. New genuine, they are around $450, from memory. 2. I replaced it the same day and took it on a test drive without any problems. if you tighten and you hear a crack - thats too tight =) On my 328i i would have to … Then reset the TPS by unplugging it and do a key cycle then off and plug it back in. 1. Unplug the TPS harness Using an Ohmmeter and, without moving the throttle, check the resistance across the black and blue wires. Your gas pedal is attached to the the throttle valve (either electronically or mechanically) — as you press the pedal farther in, the valve opens more. Once you have identified the TPS sensor, turn on the ignition, do not start the car, make sure the volt meter is on twelve volts DC. Here’s the table you should use. I spent more time trying to unplug the sensor than I did swapping it, lol. If you unplug it the car will still run, but will not run as well as if it were still plugged in. The throttle position sensor (TPS) itself is not defective. So I ordered a new one and got the same results. Click to see full answer Simply so, can I unplug my TPS sensor? The TPS sensor is a potentiometer, providing a variable resistance depending on the position of the throttle valve (and hence throttle position sensor). It is just like a distributor, on … As the throttle valve opens, the output increases so that, at wide-open throttle (WOT), the output voltage should be about 4 volts. My Fix. Retighten and try again. What the P0121 code means. I cut a couple small strips of insulated wire to use as shims to hold the bolt in the new position giving me a permanent, worry free fix. By monitoring the output voltage from the TP sensor, the PCM can determine fuel delivery based on throttle valve angle (driver demand). Maybe you're electronically pegging your mass air? Has anybody that has cleaned there carbs on an 800 powertek actually do this or … The two metal prongs under the TPS move when the throttle is pressed. If battery is disconnected to reset the ECU or the TCM, or Throttle body or Throttle Position Sensor is changed then the Automatic Gearbox “Basic Setting” sequence above must be done first if the Corrado is an automatic model.) How to Check the Throttle Position Sensor with a Scan Tool. At closed throttle it should read 1.1K ohms, when at full throttle it should read 4.3k ohms. PhotoTrail, the Jeep starting getting a check engine light. Another weak point is the throttle position sensor. Volume controls, tone controls, and balance controls are all three-terminal potentiometers. If you fail any of the tests, then you will need to adjust the TPS position. Mercedes Throttle Position Sensor. That clip you will need a small pocket screwdriver to lift the clip up to release it from the sensor. Below are common symptoms of a faulty TPS. It consists of mechanical parts which may become worn and require replacement. P0121 is a generic OBD-II code which indicates that the Engine Control Module (ECM) has seen the TPS sensor circuit A learned output voltage go above or below the sensor's expected range when compared to TPS sensor circuit B. Which the TCM uses for clutch controls during shifting. Check out the mass air tech article on www.lasotaracing.com for a good technical yet understandable explanation of what that is At 0.65v the TPS % reads 0.4% even after reset.. Also Know, can you drive with a bad throttle position sensor? Plug in the wiring harness connector if you are not going to change it. A faulty throttle position sensor sends incorrect information to the ECM resulting in various issues in the engine, its performance, and fuel economy. At a closed throttle position, the output of the TP sensor is below 1.25V. How a throttle position sensor works. the throttle position sensor looks as iff it could be 2 fastening bolts to hold it in and a harness to unplug. The throttle position sensor can fail in several ways, all of which result in poor fuel economy at best, and performance limitations that may create a safety hazard for you and other motorists at worst. When you get it set, tighten up the screws. The TPS puts out information that is used together with the information from the engine load. 2000 mazda mpv lx.The throttle position sensor (TPS) keeps the PCM informed about throttle position. That is for the throttle body as well as the throttle position sensors. You could also check that your voltage increases with increased throttle position. Throttle Position Sensors (TPSs) are relatively simple devices. Install the new throttle position sensor and tighten the bolts firmly. There are many sensors that work with the sensor via the computer. This sensor can fail gradually, or all at once. I've read that if you unplug it and the engine runs the same, that's a bad tps. Will a bad throttle position sensor throw a code? (NB. Check out these companies that offer Mercedes throttle body repair service (eBay link). The TPS monitors the position of the throttle valve, which regulates how much air is supplied to the engine. Apply a few drops of anti-stick solution to the tip of the replacement throttle sensor and install it in the throttle chamber. But if you are over 0.55v, this won't reset the TPS % back to 0 for the voltage the TPS Sensor is sending. 3) Insert the appropriate feeler gauge into the throttle assembly. Well that was a relatively painless, it took me less than 10 minutes to swap it out. So out comes the screw driver . 4. When i check out the unit as a spare part online it looks pretty straight forward. Welcome to SAU Community. I was going to remove the throttle body but I thought I would try to turn the screws first. In most of the cases, all of these symptoms will show together making it easier to detect the faulty component. The ECU doesn't need to be 'relearned' or reset. I called around and was told to replace the Throttle Position Sensor. Throttle Position Sensor. Remove the faulty sensor from the throttle chamber. I've finally got so sick of hearing driveline slack when looking for a car park due to the notchy on off accelerator and all of the above hassles. P0121 code definition. Take a fully closed reading off the primary for you. The family was loaded into the Jeep and we headed for the trails again. Top 6 Bad Throttle Position Sensor Symptoms. 3) Remove the 2 screws and then the TPS. :thumbup: The throttle cable, that connects the accelerator pedal to the throttle plate, is not binding, broken, or damaged in any way and causing the throttle plate to not fully close or move in a smooth way. Before starting note the alarm and radio setting codes / set up sequences which be needed for later. And then adjust the sensor to 1.6k Ohms taking your reading off the outside 2 pins. It can also cause problems when changing gears, or setting base ignition timing. Next, have a friend hold your throttle WIDE OPEN and check the resistance across the black and YELLOW wires. 3. Close the secondaries all the way by hand. Unplugged Throttle Position Sensor and truck runs good, but idles high [this is with idle adjustment screw turned all - Answered by a verified Auto Mechanic We use cookies to give you the best possible experience on our website. It should read between 3.5 and 6.4 ohms. Adjust sensor until correct reading is attained. There is a relearn procedure for the transmission but you need a Tech 2 diagnostic with the appropriate software.It only for automatic transmissions. Old (part #89452-12050) and New (part #89452-22090, about $74. The throttle position sensor in your engine transmits information about the position of your throttle to the electronic control module or ECM. Make adjustments the way I mentioned before on the tps to achieve the correct resistance readings. The throttle position sensor only detects the position of the throttle and send it to the CPU with other measurements from the power train and the Map sensor to determine how much fuel should be given the engine. Keep the key off. The anti-stick solution will make it easy for you to remove the TPS in case you need to replace it again. The sensor signal is used by the engine control unit (ECU) as an input to its control system. The second number should be 76% of the first number. When a throttle position sensor goes bad, your vehicle may … It sends input to the electronic engine control so that ignition and fuel injection timing can be adjusted for proper engine operation. The throttle position sensor is an important element in the operation of the engine. Either because you replaced it with a new one or you have tested it. Unplug the wiring harness connector on the throttle position sensor. Locate the connector that goes from the ECM (engine control module) to the TPS. Unbolt the sensor from the intake or throttle body, using the appropriate socket. Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem. The clutch data is learned which translate adaptive data cells. They were very easy to remove. Huge weight off my shoulders as I had thought either the sensor(s) was shot or the throttle … To add on for anyone who tries this: I found that pressure from the throttle made the TPS slide back to its original position with the open room in the bolt holes. Unplug the tps sensor and stick the meters leads into the connector. A malfunctioning throttle position sensor will relay bad data to your car's computer and usually result in poor fuel economy. All the generic codes that are related to the TPS range from P0120 to P0124. The problem duplicated itsef again, only not as violent. I loosened off the two screws and got the feel of how the TPS operated. Decided to dismantle everything and unplug and re-plug the TPS connections, and lo and behold its solved. Problems Gone. 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