Can A Bad Throttle Position Sensor Cause Hard Shifting

Load information of your engine is commonly taken primarily from the TPS (throttle position sensor) or the MAP sensor (manifold absolute pressure) controlling transmission shifting and downshifting when stepping on the gas. So i have had this 2007. Hooked everything up and added the MAF and throttle position widgets to the main screen so I could see if those sensors were bobbling around during the missing. • Loose timing belts or belts that have jumped a tooth can also. The TPS or throttle position sensor feeds the ECM with throttle opening and rate of change. The transmission doesn't know how hard yuo're mashing on the accellerator, so it shifts at pre-determined points with firm clutch applications so the clutches don't wear if, for example, you have it floored. Again accelerate up to 5th gear from a standstill; this time at an even high throttle opening (about 2500 RPM). The camshaft position sensor (CMP) is just one of the many electrical parts found in a vehicle. Step 3 - Drive the vehicle while trying to maintain a constant throttle position as it accelerates up through all four gears. It contains electro-mechanical parts, which are prone to weathering. To diagnose many of the problems, you will need little more than a test light, a volt meter, a vacuum gauge and maybe a can of brake clean. • Incorrect adjustment of the CTPS may cause one or more of the following Diagnostic Trouble Codes (DTCs) to be displayed: P1447, P0120, P0510, P0731, P0732, P0733, P0734. Took vehicle to dealership and they stated the the TPS sensor was bad, throttle body dirty, fuel pump bad, etc etc. sometimes a certain spot burns out on the sensor put only a specific spot (its a potentiometer so it isnt necessarily "good" or "bad" it can have bad spots) burns out so when your throttle hits that section, your fuel may hiccup for a second while you race. You can get the throttle position sensor separate from an entire assembly and yes this saves you money. The malfunctioning TFT sensor produces harsh engagements, a hard 1-2 upshift, a flare on the 2-3 shift, no 4th gear and no converter clutch apply. Other components and systems also rely on the sensor and the Automatic Transmission Shift Position Sensor Switch, so you'd best replace the switch as soon. Pre-Alpha, Alpha One and Alpha Gen II engines use a Shift Interrupter Switch. Being those gear changes happen at about 10 and 20 mph, it's not hard to use this technique to overcome the issue, but there is an issue, obviously. A bad sensor can be diagnosed by measuring its resistance and watching for a change as the engine warms up. check the shift cable, it may have broke or is way out of adjustment. So, if the Equinox loses signal from the Throttle Position Sensor for a moment, it'll feel like a stall. With that said, if just replace the TPS without cleaning the throttle body and repairing any sticky situations the problem persists and the low power light. The reference voltage circuit is labeled 5V ref. I got "P0122: Throttle/Pedal position sensor A circuit low input". What are signs of a bad Throttle Position Sensor? Acceleration issues: A bad TPS may cause all sorts of power issues. The computer calculates this time based on information from its sensors. Most common is a hard shift from 1st to 2nd gear. Some codes pertain to more than one system but there will be only one of the systems on the vehicle. the only thing i am reading on them is the voltage and it is in range. A transmission control unit or TCU is a device that controls modern electronic automatic transmissions. In addition, a faulty mass air flow sensor might cause the Check Engine or Service Engine Soon light to come on. The possibilities are endless to what the cause could be. Before you conclude that the crankshaft position sensor is bad you may need to run some tests. It often has a wide open throttle and a closed throttle switch either as part of it or as separate components. The replacement throttle position sensor (TPS) must be correctly aligned on the throttle lever bushing. When you have a bad oxygen sensor, your vehicle will run less efficiently, it can sometimes have a poor idle, erratic jerking at steady throttle, hard starting problems, cause the check engine light to come on, and will cause high fuel consumption. 1) The sensor is bad and the engine is not knocking. See DTC 113: TCM FAULT. Symptoms of a Bad TPS. shift little hard from 2nd to 3rd and little less hard from 3rd to drive. Symptoms for a bad Throttle Position Sensor. GM Throttle Position Sensor Problems. The TPS tells the computer how far the throttle is open. No throttle opening is required or should ever be used. The other problem we are experiencing is that when the truck is running, as soon as you put it into gear, either Reverse or Drive, it stalls out instantly. Multimeter (set to DC voltage- 20 scale) B. Pin 11 Orange is +5v reference feed. thanks in advance. He said the bad connector could also cause a bad ground problem at the ECU. 1 Control Circuit. The (TPS) also relays information to your anti-lock braking system so that it can supply the traction aids your car needs at a given speed. Engine hesitation during acceleration: a bad throttle position sensor will make very hard for the ECU incrementing the necessary amount of fuel during sudden acceleration. The reference voltage circuit is labeled 5V ref. Do you guys know if the TPS is covered under the warranty? I ride an '04 gix6. P0122 Ford Description The throttle position sensor responds to the accelerator pedal movement. On some vehicles, there are sensors that function specifically for certain parts of the vehicle. It can, Javier, but so can the electronic throttle body. The throttle position sensor is one of the most crucial components of any fuel injection system, right after the computer and fuel injectors in terms of importance. Symptoms for a bad Throttle Position Sensor. [email protected] When the sensor does go off (flash only, no audible warning), we stop, open the flui. When the problem is not present it works perfectly. it only happens when city driving and temperature breaks past half way. Volkswagen Cabrio Shifting/Drivability Issues Due to Throttle Body Failure - 13 reports. Checking the Throttle Position Sensor signals using a scanner. Injector o-rings bad, will cause low ICP. Step 1: Gather your tools A. I noticed on my 98 that over time the cable stretched and got looser and causes the transmission to shift really slow. This might also cause severe damage to your automatic transmission, which is bad news if you’re trying to save money. May not illuminate light or set. This might also cause severe damage to your automatic transmission, which is bad news if you're trying to save money. it only happens when city driving and temperature breaks past half way. Related Symptoms Bucking. Chafing could cause short circuits, and breaks could cause open circuits. With that said, if just replace the TPS without cleaning the throttle body and repairing any sticky situations the problem persists and the low power light. it will cause hard shifting as well as irratic shifting, so will a Pressure regulator solonoid, but since you have a code for a wheel speed sensor i would go with that, and it would probably be a easier fix too than a pressure regulator solonoid, most especually if you have a car with the 4T65E or 4T60E trans. The MAF sensor measures the amount of air flowing through the throttle valve. This is the one that really whipped me on the car that made me want to learn more about this issue. For 1995-previous model year EFI-equipped GM vehicles. I havent noticed any slipping. ok, on upshifts, it slams into the next gear, 2nd to 3rd is probably the worst of all. as well as a slight thud on downshift when braking that wasn't there before. Some MAP sensors are connected to the intake manifold by a hose. What we can't have it 5 volts at wide open throttle position. 27: Injector No. Why is cruise control so bad with hills? Its an older system, '02 era, maybe they've gotten better, but my car will be chugging along at 2krpm slowly losing speed, lose 5 mph, downshift, hit 3krpm, get back up to speed, upshift, start losing speed again and the cycle repeats for a lot of the hill. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor. So in order for the transmission to shift properly, it needs know such things as what position the transmission range switch is in, the RPM’s of the engine, if the brake/gas pedal is being applied, etc… If the BCM garbles the signals between these computers/modules it can cause erratic function of a component. By measuring how much oxygen is left un-burned in the system, the trucks computer can adjust the air/fuel ratio to maximize performance. It’s a sensor. 8L engine - having problems with the idle, acceleration, power ,etc. That will cause the trans computer to short out and we end up in limp home mode and thats really hard on the trans. You may have to register before you can post: click the register link above to proceed. 'I recruit hard:' North Dakota worker shortage persists amid low national unemployment How parents can talk to kids (and other parents) about cannabis in a shifting landscape A study out. Throttle position sensor voltage low: 123: Throttle position sensor voltage high: 125: Taking too long to reach proper operating temparature and switch to energy-efficient mode: 129: Bad barometric pressure sensor (thanks, John King) 130: Sensor heater relay problem: 131: Oxygen sensor seems to be shorted out or broken: 147: Oxygen sensor heater element not working properly (this device helps to reduce emissions more quickly) 151. I recently had one of the camshaft position actuators on my '07 Pontiac G6 go bad. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. These operations are affected when a bad throttle position sensor feeds erroneous data to the car's computer because of which the: Engine malfunction indicator light (MIL) is turned on. com as Symptoms of a Bad or Failing Throttle Position Sensor. Newer engines even have control of the valve timing, for which the TPS value is also used. Re: They sell throttle position sensor but no retaining screws Unless you don't plan on keeping this particular TPS, you could grind into the ends to get to some material that you can grab. shift little hard from 2nd to 3rd and little less hard from 3rd to drive. I topped off the coolant and that went away, I drove maybe 7 miles across town to get into 2015 Chevy Camaro and at 3am I went to go to work in my 08 impala LTZ and it wouldn’t even start. Symptoms of a Defective Throttle Position Sensor Following is a list of symptoms, either of or a combination of which, an operator may experience because of a defective throttle position sensor: Bucking and jerking. Sometimes the spark is delivered late, weak or not at all. Pin 11 Orange is +5v reference feed. Here is how to diagnose a bad throttle position sensor TPS on a car or truck. GM Sensors have traditionally been outsourced to overseas manufacturers, the same ones who supply throttle position sensors to other makes like. Symptoms of a bad transmission range sensor:. Checked throttle position sensor with voltmeter and was fine according to Haynes manual. hard shift when hot Intrigue Car Forums. Under low throttle, there's not much in the cylinder to slow the piston down as it reaches TDC. Will it do all of them? Maybe, maybe not. all or part of. Best Answer: No, a bad TPS (Throttle Position Sensor) will not cause overheating. It had been exhibiting somewhat the same behavior but far, far worse (wouldn't get into the final gear, a couple misfires, would constantly accelerate when the cruise was set). (If you're having difficulty locating the throttle body, ask a helper to press the accelerator, with the engine off, so you can see the movement of the throttle shaft. Does This Sound Like Your Car?. There are a number of different problems that can cause similar symptoms to a crankshaft position sensor problem. The part was $40, I'm going to put it in this weekend. The Governor was for road speed and the TV cable was for throttle input. This may possibly be the cause of the poor running. Similarly, the wiring between the ECM and MAP sensor should be intact. The TP sensor is used to detect engine load. Symptoms of a Bad Throttle Position Sensor The function of the throttle position sensor, aka TPS, is to supply information to the car's computer about the position of the car's throttle. Is it Possible to Repair a Faulty Throttle Position Sensor? Yes, if you know what you're doing. The ICP sensor and connector terminals should be inspected for damage (the ICP is at the rear of the engine, under the turbo), and the sensor circuits checked for opens or shorts. Here is a list of the most common ones: 1. Could bad o2 sensor cause auto tranny to not shift? Posted by Lets hope it's not too hard to replace if I can find one. When the TR sensor fails it can cause wrong gear starts, no upshifts, or what feels like a falling-out-of-gear condition. Why is cruise control so bad with hills? Its an older system, '02 era, maybe they've gotten better, but my car will be chugging along at 2krpm slowly losing speed, lose 5 mph, downshift, hit 3krpm, get back up to speed, upshift, start losing speed again and the cycle repeats for a lot of the hill. For a MEMORY code, it WAS out of range at one time (possible intermittent wire etc. To fix the situation, you can get your. Best Answer: No, a bad TPS (Throttle Position Sensor) will not cause overheating. But if there is one thing that crops up time and time again it is a poor idle. Knowing the symptoms of a defective throttle position sensor can help you quickly diagnose the problem and make needed corrections. Carefully follow these instructions to ensure correct procedure. I'll report back with my findings. There are a number of different problems that can cause similar symptoms to a crankshaft position sensor problem. Some MAP sensors are connected to the intake manifold by a hose. We can't do anything about adjusting the high voltage. This sensor is located on the driver's side of the transmission with the shift linkage. Hold the throttle body with your hand, so that the throttle position (TP) sensor cover is facing upward as shown in Figure 1. If I gave it hard or full throttle it would shift fine, but normal driving it would shift through all the gears, each too soon, bogging the engine down. if your taking it easy, it slams into gear. If you tap the tps and the rpm's change , the tps is bad. Tire Pressure Sensors All 2006 and newer passenger cars and light trucks are equipped with tire pressure monitor systems (TPMS) to keep an eye on tire pressures. It should not be too hard or too easy. It's part of the signal circuit for the throttle position sensor. A splice is denoted as a solid black dot that connects two wires. Electronic Control Transmission (ECT) The Electronic Control Transmission is an automatic transmission which uses modern electronic control technologies to control the transmission. P0122 Throttle Position Sensor/Switch A Circuit Low Input OBD-II Trouble Code Technical Description. In reading through several forums, I read a horror story where a Dodge dealership wanted to replace the entire transmission for a similar problem for around $4000 but the person declined and found fixed it by replacing the throttle position sensor. The TP sensor is used to detect engine load. My '03 Jetta (5 speed, 256k) has a fuel line issue. It's a thin steel cable that connects to the throttle body (it's the lower cable). The information from the vehicle speed sensor (VSS) affects fuel injection, fuel mixture, ABS, transmission operation, etc. Best Answer: No, a bad TPS (Throttle Position Sensor) will not cause overheating. Here are the Symptoms of a Bad Throttle Position Sensor One of the more frequent problems with modern vehicles is a bad throttle position sensor (TPS). 'I recruit hard:' North Dakota worker shortage persists amid low national unemployment How parents can talk to kids (and other parents) about cannabis in a shifting landscape A study out. A weak battery or a bad throttle position sensor can also cause erratic idle. NOTE: When you see "is/was" listed for a code: For a HARD fault code the sensor IS out of range right now. I've been driving my E for a few months this way because I have not had the money to fix it. (If you're having difficulty locating the throttle body, ask a helper to press the accelerator, with the engine off, so you can see the movement of the throttle shaft. Being those gear changes happen at about 10 and 20 mph, it's not hard to use this technique to overcome the issue, but there is an issue, obviously. DIY - Replacing Idle Air Control valve (IAC) or Throttle Position Sensor (TPS) Welcome to TheMalibuCrew! As a guest, you are welcome to poke around and view the majority of the content that we have to offer, but in order to post, search, contact members, and get full use out of the website you will need to Register for an Account. Driving with these symptoms will put you and other drivers around you in danger so you should bring your car to a mechanic as soon as possible. This might also cause severe damage to your automatic transmission, which is bad news if you're trying to save money. Can a malfunctioning TPS cause an automatic transmission to have difficulty changing gears? I have a 2000 Honda Civic EX, recently it hasn't been starting normally. TPS detects how far your throttle plate is open also to assist in measuring engine load. No change, or an open or closed reading would indicate a bad sensor. External sensors like the throttle position sensor, vehicle speed sensor or output speed sensor quite often go bad, causing these symptoms. A transmission control unit or TCU is a device that controls modern electronic automatic transmissions. [email protected] As a result, a bad mass air flow sensor causes various driveability problems, including a no-start, stalling, lack of power and poor acceleration. A bad O2 sensor may cause the PCM to believe the cylinders are running lean, and cause it to run the cylinders rich, but usually not misfire unless there is a another problem present. 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. OXYGEN (O2) SENSOR. Pre-Alpha, Alpha One and Alpha Gen II engines use a Shift Interrupter Switch. This is because a faulty TP sensor will cause erratic shift timing and affect torque converter engagement. How do you know if a throttle position sensor (TPS) is bad? Of course, some symptoms can tell you when a TPS may be bad. I'll report back with my findings. Throttle position sensor input above the maximum acceptable voltage. thanks in advance. Throttle Position Sensor Test (voltmeter and scope) By Reagan Mayer Articles , Blog 47 Comments Tags: auto repair , Auto Tech , auto tech training , automotive , car repair , circuit integrity testing , DIY auto repair , Engine Performance Diagnostics , how to test a throttle position sensor , Rosedale , throttle position sensor , TPS , TPS. gov Jay Brusse Dell Federal Government Services jay. Newer vehicles are going to have a TPS tell the computer when to add more fuel versus having a direct connection between the injectors and the pedal. It can come on for various reasons and sensor problem is one of crankshaft position sensor symptoms. Always run a scanner first to see if a sensor is causing your problem. However, here is a list of the most common symptoms associated with a. The angle of the throttle opening is instrumental in calculating fuel delivery and ignition timing. I got "P0122: Throttle/Pedal position sensor A circuit low input". Car accelerates, but won’t exceed a relatively low speed, or shift up. The shifting problem usually surfaces when the vehicle is first started and the engine and transmission are cold. The two mornings i was there, it began shifting very hard when cold. The part was $40, I'm going to put it in this weekend. If unmetered air is entering the cylinder through a leak, the engine load will be below the actual percentage causing the module to use different shift points and line pressures. The reference voltage circuit is labeled 5V ref. The TPS connects to the throttle plate on the throttle body. When you go past 1/2 throttle, the spark advance is less. So if the TV cable is not adjusted properly, it can cause numerous transmission problems. On models. What are signs of a bad Throttle Position Sensor? Acceleration issues: A bad TPS may cause all sorts of power issues. Some claim a leaking EGR valve can cause a high Idle but I would expect it to be very rough because of the dilution with exhaust gases. These operations are affected when a bad throttle position sensor feeds erroneous data to the car's computer because of which the: Engine malfunction indicator light (MIL) is turned on. OXYGEN (O2) SENSOR. Warm start problems This would stop bleed back of fuel, and keep fuel in the line so the vehicle can start without issue (according to some) the next time. Mechanic adjusted Throttle Position Sensor above the recommended spec voltage (says from experience he does this because the car responds better to that setting). A strong solvent can cause deterioration of not only sensor seals, but also throttle shaft seals. Throttle Position Sensor (TPS): A variable resistor at the engine’s throttle body that controls current flow to ground. A code indicating a bad O2 sensor usually means the sensor itself is bad (but not always), but a bad O2 sensor can cause codes that don't specifically indicate O2 sensor itself. It could happen at any time: You are driving on the highway, moving. Some MAP sensors are connected to the intake manifold by a hose. 28 volts (less than 70 PSI) with the key on and engine off. This can be dangerous, so take safety precautions. Throttle Position table is the primary method of “tuning” a Drive-By-Wire throttle body system. The other solution is to simply turn the key and leave the vehicle in the on position for 3-5 seconds to allow the fuel pump to prime. External sensors like the throttle position sensor, vehicle speed sensor or output speed sensor quite often go bad, causing these symptoms. External sensors like the throttle position sensor, vehicle speed sensor, output speed sensor and inhibitor switch quite often go bad, causing these symptoms. External sensors like the throttle position sensor, vehicle speed sensor or output speed sensor quite often go bad, causing these symptoms. Also, in this section you'll find the info you'll need to successfully test and troubleshoot your TPS Sensor or code. Symptoms of a bad transmission range sensor:. You could pull the whole throttle body to work on it also. So, if the Equinox loses signal from the Throttle Position Sensor for a moment, it’ll feel like a stall. A throttle position sensor (TPS) is situated opposite the throttle linkage connection on the throttle plate. This is done to allow the xxx to detect problems with the TP sensor. This is because a faulty TP sensor will cause erratic shift timing and affect torque converter engagement. This might cause a rough idle or even an engine dying occasionally while idling. Don't worry you can't cause any damage with this reset. Mechanic adjusted Throttle Position Sensor above the recommended spec voltage (says from experience he does this because the car responds better to that setting). Replied by Sw20 ant on topic Solving Honda Idle Issues (hunting idle) how is going, I'm new here to the forum but not new to your videos! I always come across them all the time and there is a lot of good information on them, I've been having idle issues with my integra and I've pretty much changed everything except the hard parts (intake. NOTE: Some codes not supported on all models, consult your specific vehicle's service manual for the correct trouble code list and description for your application. I am having some problems with what i believe is the transmission thats bad or maybe a TPS thats acting up. In that case, cooling down the engine for some time will cool off the sensor too and turn the light off. When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. All,The engine sensor on our Chap goes off every once and while. gov Lyudmyla Panashchenko NASA Goddard lyudmyla. com as Symptoms of a Bad or Failing Throttle/Accelerator Pedal Position Sensor. A faulty throttle position sensor or switch due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms. if you are under hard throttle, the shift is a bit smoother. i doubt it! i had a bad throttle position sensor on my car and it still started, didnt idle worth a crap but it started. I am struggling to figure out why I’m still getting a misfire code on my 07 ram 1500 4. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. so I started replacing & cleaning other related idol sensors. With or without a distributor, erratic idle (including high idle speeds) can be caused by a faulty throttle position sensor (TPS) - a common problem (see diagnostics below). When you send the carb cleaner into the air intake, maker certain the little red straw is firmly attached. 3 people found this helpful. Dealership replaced the fuel pump modulator as it was faulty and it was tell the fuel pump that there was an excess of fuel pressure when there wasn't so the engine wasn't getting the fuel it needed to fuel. When the knock sensor hears an engine detonation it retards the ignition timing to solve the problem. and yes i meant throttle position sensor instead of tsp. Checked throttle position sensor with voltmeter and was fine according to Haynes manual. In some cases, such as Volkswagen vehicles with the 01M transmission, this malfunctioning sensor will not produce a trouble code, yet could cause harsh and flared shifts. The replacement cost of the average speed sensor will be between $20 and $50. The throttle position sensor will not make the transmission go into neutral at an idle. From a Throttle position sensor to an internal transmission issue. A bad oxygen sensor either retards or advances the engine ignition timing, which can cause engine pinging. The CEL likely has nothing to do with the hard shifting, you can see what the code is by having it scanned for free at any number of local chain autoparts stores. Also, please make sure that a small amount of the sensor's travel is being used at idle. No pattern or cause that the admiral or I can figure but it is driving me nuts. (Throttle Position Sensor) - 1994 Chevy C1500 350 TBI. If it's out of calibration or faulty, it could cause driveability issues. A damaged, malfunctioning TPS can cause variety of symptoms which are also known as symptoms of a bad throttle position sensor. As a result, a bad mass air flow sensor causes various driveability problems, including a no-start, stalling, lack of power and poor acceleration. If you have a newer truck that uses EEC-V, you can get information on those codes here. Most common is a hard shift from 1st to 2nd gear. In some cases, such as Volkswagen vehicles with the 01M transmission, this malfunctioning sensor will not produce a trouble code, yet could cause harsh and flared shifts. This might cause a rough idle or even an engine dying occasionally while idling. Pin 11 Orange is +5v reference feed. A bad sensor can be diagnosed by measuring its resistance and watching for a change as the engine warms up. Took it to my menchanic he put the transmission computer on and said it was the Throttle position sensor that it had a bad spot on it. Testing for TPS Problems. I had bad PEDAL Position Sensor on 300 diesel, but my car would display CEL with "engine electronic" message. Granted there are times riding single track that it is hard to lay off the throttle because of the grip you have on the bars. This article originally appeared on YourMechanic. I took the oxygen sensor out again and put the torch to it to clean it off. A total of 5 connectors to see if there would be a change in performance and there was none. Jeep Grand Cherokee 1993-1998: How to Test and Replace Throttle Position Sensor The Throttle Position Sensor (TPS) sends the throttle plate position to the ECU. FAILURE SYMPTOMS: Hesitation on quick acceleration (passing, "floorboarding it") , sometimes bad idle. When the throttle position sensor fails, it defaults to idle speed. I suspected throttle position sensor was bad and upon reading actual voltage with a real tool - it showed one bad and the other suspect on the range I replaced the tbody and it fixed the issues. If not you need to diagnose throttle position sensor, throttle body. Driving with these symptoms will put you and other drivers around you in danger so you should bring your car to a mechanic as soon as possible. • Incorrect adjustment of the CTPS may cause one or more of the following Diagnostic Trouble Codes (DTCs) to be displayed: P1447, P0120, P0510, P0731, P0732, P0733, P0734. Newer vehicles are going to have a TPS tell the computer when to add more fuel versus having a direct connection between the injectors and the pedal. Then it just started to run again. Most General Motors cars will have. Disengage the wiring harness connector from the IAC valve. Most Common Symptoms of a Faulty Engine Speed Sensor. if not then change the gas filter. When i try to clear the code idle goes up a little bit and then check engine light comes right back on with idle returning to the normal position. No throttle opening is required or should ever be used. GM Throttle Body Special Policy Letters. Some cars use both an accelerator pedal position sensor on the pedal and one TPS sensor on the throttle body, while some cars do only have a TPS sensor on the throttle body. PO123, TPS (Throttle Position Sensor), apparently since the sensor isn't working it can't tell the van when to shift properly since it isn't seeing the throttle open. 2500 to 2700, which would be the hard shift. This can compensate for low octane fuel or tank full of bad stuff from an unscrupulous gas station. Now it shifts hard from 2nd to 3rd and 3rd to OD and back down. Answer D is wrong. The consumer stated she was backing out of the driveway, when the vehicle took off like a missile. Symptoms of a bad sensor would include lean/rich codes and poor fuel economy. A faulty throttle position sensor or switch due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms. So you need to conduct some tests. and yes i meant throttle position sensor instead of tsp. A malfunctioning transmission or speed sensor may tell the vehicle to shift at the wrong time, or too late. I had code 13 on the TCS and 21 the TCM (throttle actuator (throttle motor circuit open). Disengage the wiring harness connector from the IAC valve. Similarly, the wiring between the ECM and MAP sensor should be intact. Likewise, the idle speed motor can go bad. How the Throttle Position Sensor Works on Your Honda Civic. However - you CAN get out of a potentially bad situation, merely by manually shifting the transmission down one gear - this increases the engine speed, which means that the throttle plate will now open to a place where the throttle position sensor is not as badly worn, and the hesitation episode will be over. • Loose timing belts or belts that have jumped a tooth can also. I got "P0122: Throttle/Pedal position sensor A circuit low input". A faulty throttle position sensor or switch due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms. Depends what speed sensor. What could cause this problem? The most likely cause for the problem you describe is a bad manual lever position sensor (MLPS). Electrical Failure of an Accelerator Pedal Position Sensor Caused by a Tin Whisker and Discussion of Investigative Techniques Used for Whisker Detection Henning Leidecker NASA Goddard henning. I'm about to replace a bad cat converter and someone suggested that can overheat the tranny and cause this?. Tire Pressure Sensors All 2006 and newer passenger cars and light trucks are equipped with tire pressure monitor systems (TPMS) to keep an eye on tire pressures. Hard transmission shifting coupled with a MIL is almost always, in my experience, the throttle position sensor. Supertech. A bad throttle position sensor can cause inability to shift up, rough or slow idle and lacking power when accelerating. It may also be an issue with the connection with the sensor, or short in the wiring harness for the sensor. Your engine may start up but it will have little to no power and it causes it to shut off. if not then change the gas filter. EEC IV 2 DIGIT CODES NOTE: When you see "is/was" listed for a code: For a HARD fault code the sensor IS out of range right now. A variable resister used to control voltage in a circuit. Depending on the vehicle year and maker the ECU may not compensate for this failure during idle. So if the TV cable is not adjusted properly, it can cause numerous transmission problems. the only thing i am reading on them is the voltage and it is in range. [email protected] What could cause this problem? fluid is full and clean. You can get the throttle position sensor separate from an entire assembly and yes this saves you money. Granted there are times riding single track that it is hard to lay off the throttle because of the grip you have on the bars. Say you improve something, adjust the ALDA or whatever, your makeing more power, so you tend to be less on the throttle overall driving around, and therefore your trans is shifting softer than it was for a given acceleration. The reply was the TPS (throttle position sensor) needed to be replaced. 3 people found this helpful.