Have Transmission Questions? Ask a Mechanic for Answers ASAP
Hi my name is ***** ***** I will be happy to assist with this today.I apologize for any delay.
Have you had the fault codes re checked recently with a fully compatible scan tool to see what codes are setting with this issue here?
Let me know so we can continue,thanks Pete
Was wiring ever checked leading from the computer to the transmission at all for any corrosion or damage?
Is the engine revving up to 2500 or 3500 rpm before it moves at all?
O.k.,so we can rule out the transmission and wiring.
How many times was the TCM replaced?
Same results with both TCM's?
Do you have a scan tool that displays throttle position sensor data signals?
With all that has been done here this sounds like a possible fault with your throttle position sensor sending an incorrect signal which can cause the engine computer to send incorrect signals to the tcm.In some cases it can be the engine computer at fault needing replaced but if you can I would have the throttle position sensor checked for any issues with it needing replaced.Usually this is checked with data signals on a compatible scan tool.
Let me know if you need anything else and feel free to rate my help here as this is how I receive credit for my time.A 5 star rating is appreciated.Thanks Pete
This is possible.It can provide enough voltage but if there is corrosion or damage to the wiring or connection this will cause low amperage that will cause this fault here.I would trace the transmission wiring from the transmission to the TCM and see if any corrosion or damage is found.
Let me take a look real quick I will post back here shortly.
The TCM does make its own 5 volt from the 12 volts it receives.Shown as the sensor supply voltage.Below is the diagram info for the TCM on this model here.
Well in some cases if a TPS is sending erratic signals it can cause transmission shifting and operating issues,I have seen this several times before.I would double check the transmission wiring for any issues needing resolved as well here.Usually no codes set and no over heat issues and the throttle position sensor reading correctly will allow manual mode.
If you open the throttle plate by hand with the scan tool connected does the tps show 100%?
It does look like your TPS is sending a correct signal here.This is a difficult question for me to answer myself with all that has been done and I dont show any testing info for the TPS sensor or transmission controls for the transmission myself.If you didnt get a chance to reinspect the wiring I would check and see if any wiring issues are found.If you would like I can open your question for others here to see if anyone else can assist further on this just let me know if this is something you would like to do.
I will open your question up for others here to see if someone else can assist further on this as there may be others here that may have more info on what to check or do with this issue.I hope you can get this resolved with ease.No need to reply to my last post here unless it is a last resort as it will keep your question locked to me and others will not be able to view it.If you feel you want to continue to work with me on this feel free to reply at any time but keep in mind in some cases it can be difficult to fully diagnose or help repair this without seeing your vehicle.