Transmission Problems? Ask a Mechanic for Answers ASAP
I am sorry that you have not been helped yet. I just came online and saw your question
Is the check engine light on, and if so, have you had it scanned for fault codes? If so, what are they?
Have you checked the fluid to see if it is black or burnt smelling, or low? Or if there is metal shavings in the fluid
Please remember that I am not there to, therefore I rely on you to provide as much detail as possible. On occasion I may need to ask for more information or clarification
Thanks for the added information. Ok, with P0717 fault code and the symptoms, it wont be the fluid and wont be internal. It is strictly in the electronic transmission control system on the input speed sensor circuit.
Since you have replaced the sensor, it is either a short or open in the wiring harness or a failure of the input sensor circuit in the PCM(powertrain control module)
If you have a digital voltmeter and feel comfortable doing some testing, I can upload directions for testing the wiring to determine if it the wiring or the PCM at this point
Ok, I have uploaded the testing procedure and pcm connector pinout needed. Make sure to do the resistance test for the sensor as it could be defective out of the box
Please remember to rate service using the rating page so that I may receive credit. Thanks
If for any reason, you can't rate my answer OKAY, GOOD, or EXCELLENT today.Please reply and let me know why, so I can help more/better.All follow up responses are FREE, after completing the required rating
Ok, drive it around today for a while and when you get home and is still warmed up from the driving, repeat the tests and let me know the results
Both are input signal wires from the sensor - one is low signal and one is high signal - so there is no voltage output from the ecm on them.
Should be the same colors. I rechecked my schematics. The wiring colors dont show a change on the actual wiring diagram, but for some reason my ecm connector pinout doesnt match. I will need to opt out and see if another expert has the correct ecm pinout
seems like a failure in the pcm
the only thing to do to solve the problem is to replace the pcm
Hello. Different expert here. Please allow me to assist you. The P0717 code relates to a "turbine speed sensor no signal condition". Toyota is aware of this issue and have issued a replacement wire harness that addresses this problem. You need to go to your local Toyota dealership's parts department and order part number 82126-02050 and install this wire harness. This should rectify the problem.
You are very welcome.
The replacement harness connects at the speed sensor, not at the computer. Black is NT+ Yellow is NT-
Black to red yellow to white
you are welcome.
Assuming that your speed sensor is good, and properly positioned, the only other possibility is a flaw on the the drum that has the high and low cut outs that the speed sensor measures. A cracked tooth, a void, a missing tooth, or some other type of issue that does not allow the sensor to read each and every one of the teeht on the drum is the only other possibility that I can think of, other than an possible ECM failure (which is extremely rare). A good tech with an oscilloscope can measure the NT signal and tell you if it is compromised. That is what I would be doing next if this vehicle was in my shop. You may have good continunity form the senso tot the ECM, but, if the signal is distorted, weak, or resetting due to a mission or cracked drum tooth, that is what needs to happen next. If it is determined that the NT signal is bad at the sensor, your best recourse is to replace the transaxle. Replacement of this unit is NOT recommended because no one has the proper tools in their shop to properly reset the clearances. Not even a goo transmission shop has these tools. That is why Toyota does not allow us to rebuild the units in the shop. The clearances are super critical. If one cannot set the clearances properly, he will not have a proper rebuild and it will have problems.
To get the best result, you do the test twice. One driving, the other stationary (wheels off of the ground). If you want to do it stationary, that is OK. Run the RPM slow to start, then gradually increase. What you are lookign for is a drop in the waveform. That would equate to no NT signal. (ie an internal issue or faulty sensor)
Thanks for the reply. Assuming the speed sensor is good (a new genuine part, not aftermarket), and the wiring is all good, thsi leads us to ECM issues, or that what the sensor reads issues. For all we know, we are chasing the wrong problem. Since this is obviously a heat related issue (OK cold, starts up when hot) , perhaps we have sticking valve or valve actuators (solenoids) in the valve body. FOr the money it takes, and with the thinking of avoiding speculation on an replacement ECM, why don't you go and have the transaxle flushed? It should only cost about a hundred dollars or so (versus 800 for an ECM). The flush and fluid conditioner might clean off the valves and rectify the condition. You might be getting the code because the solenoids are sticking. If this car was in my shop I would be doing a complete flush before anything else at this point.
ok please let us know
You need to take the car to the dealer service dept and leave it overnight. The need to hook up the test box and drive it, monitoring the real time data stream. When the problem occurs, there should be some evidence resulted in the data read outs. Something is dropping out, sticking, or some other internal issue. A total lack of data would indicate a problem in the electronic control unit. A scanner will not do real time data. You need to hand this off to the professionals with the right test equipment.