QuestionQUESTION: Additional info per my prior post re: no gears, Codes P0700, p0715 p0720:
1. Small amount of transmission fluid (<1pt) found on casing and ground came from the transmission dipstick tube.
2. Dirt and moisture found inside transmission solenoid connector (picture available, top hose was removed by shop less than 200 miles ago).
3. Relay switched out with no effect.
4. Continuity between groundstrap connector below valve cover to connector on the side of the transmission casing near the driver's side wheel well and TCM body is grounded.
5. Finally and most curiously, if I remove the TCM relay I have gears L, 3, and D with speedometer movement but no reverse.
Solenoid? TCM? Help!
ANSWER: Hi Mike,
I don't recall the earlier q and a so can only go on the basis of this. In 5. if you mean that the trans mission actually shifts gears when you are in 3 and D, even with the tcm relay removed, then there must be some sort of a shorting of 12v to pins 16 and 17 of the tcm because that is what happens when the relay points close.
Aside from the possibility of bad input and output speed sensors, the codes 0715 and 0720 are supposed to result in limp mode. Is that still happening? and have you done a recent code readout? If you have checked the harness connections from the speed sensors to the tcm and found them to be OK, then if the speed sensors are both working then you would have the possible explanation of it being the tcm.
I guess that I don't have a complete picture of the present symptoms, so I may be giving you inaccurate suggestions.
Roland
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QUESTION: Roland, I managed to get ahold of a better scanner because I felt I was missing something and this is what I got
P0731 Gear 1 Ratio incorrect (of course, I don't have 1st gear)
P1782 24 Pressure Sw Circuit (explains no reverse?)
P1768 Trans Relay circuit (because I pulled the relay to get it into any gear at all)
P0700
Does this point to the solenoid pack or are the TCM or the input and output sensors still suspect?
ANSWER: Hi Mike,
I still haven't identified the date of your earlier question. So going only with what you have recently told me, the 1782 alone could be due to: a wiring problem with the circuit, a defective solenoid pack, if the trans overheated it could be due to excessive regulator valve leakage in the valve body, loose valve body bolts, plugged filter due to debris as the result of internal damage, or a defective TCM.
The 0731 could be due to about a dozen differernt possibilities mostly having to do with internal problems (other than a possibility of speed sensor problems). Two of those are defective solenoid pack and valve body, but the rest involve the clutches and other parts that would require removal and opening the transmission. The TCM is not implicated by this one.
My inclination would be to consider a solenoid pack, then removal and replacement of the valve body. Before you did the second one you will drain the fluid and that would give you the opportunity to check for debris in the pan/fluid which if found would dictate a rebuild. If clean then try replacing the valve body.
My thought is that if the rebuild is necessary then you would likely replace the solenoid pack and valve body in that process so first trying to replace those, if successful, would eliminate the rebuild. I can type-in all those dozen possibilities, although most have to do with what you could only determine by removing and opening it up.
Because you can get speedo action, the output sensor is probably OK. And the 1782 is not caused by an input sensor issue. So I would not believe those sensors are the cause. Nor is the TCM.
Roland
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QUESTION: Roland-Thanks for your help. The more I thought about the flow charts today the more I suspected an issue with the valve body but your logic about the trying the solenoid pack first makes sense. Here is the original post on 12/29 which may have gone into Kevin's pile. I purchased both the input and out put sensors originally with the intention of replacing them. Should I replace them while I have things out of the way? The science side of my brain says 'do one thing at a time' but the practical side says do it all.
"While driving at highway speed I felt a lurch in the drivetrain but was able to make it the 3 miles to my driveway. Before shutting the car off I noticed I had no reverse and the check engine light was on. The next morning the transmission would only engage in drive after revving the engine at 2k for a period of time. The codes are po715, 715 and 720. The fluid is within the limits on the stick although there are small puddles of fluid on the driver side casing even with the axle. The timing belt was recently replaced and the cooler lines were removed to take out the radiator.
Would replacing the speed sensors and flushing the fluid and changing the filter be the recommended procedure?"
AnswerHi Mike,
If you are thinking that you might not need the sensors and can return them, then I would not replace them at this point as I believe there is more than sensors involved in your problem, and in any case the sensors don't require much if any removal other than the part itself. If it will be much easier to do with the solenoid pack out of the way and you want to cover all the possibilities than change them now.
Roland
