tests: (which all posts started with why is TCC lock dead, ask why first)? You never once told me why you know its bad, or how your proved it or , its just a guess, (hope is ok if easy to do)
1:
have you measured the coil resistance? on the SOL1?
the OHMS, connector pulled.
2:have you measured the voltage on that pin, with jumper wire (sol1) to a cab voltmeter (dmm) to see if you get 12vdc at the TCC lockup moments? (be wise to do that)
OMG i never get 12vdc there, at any speed on flat ground.
what not it be a shame to rip a trans to 100 of pieces and later find it was not in the box. at all, we have like 10 posts where folks did that. (on other forums vast post)
the #1 reason why (the owners thinks DTCs tell you what part is bad, and nothing can be further from the truth)
(have you cleaned the rear VSS sensors yet, clean off that mud (metal mud it is) clean it off now. costs nothing to clean hall sensor at all, just do it,
learn that the PCM loves to hide errors,. until you do 3 trips(key on trips) this fools so many folks this fact. (hint always scan driving full speed at TCC chart stated conditions see of PENDINGS SHOW ERRORS OF ANY KIND < IN MOTION (hint2 it takes 2 persons or own a real scanner that can log data)
if number 2 fails, the TCM is bad not the TCC SOL1. (or the below called TCM inputs wrong, lots)
The TCM is a brain, a computer, in this case its (2nd process in the PCM)
the TCM also has limphome mode, and ends the TCC feature .
the TCM is scanned with the OBD2 full tool a real scanner that can see all DTCs of any kind are present for sure in motion, ECU side and TCM side of the PCM.
a full scan may show other TCM errors you missed. or engine issues, (sensors etc) did you know some many sensors reading wrong can cause TCC failure.(by design)
the TCM has 2 modes, normal and limphome.
in limphome it also skips , 2nd gear.
I will not pretend to know how ever line of code behaves in your PCM firmware, (nobody does) but will say this is a good list, if you study TCMs serious.
I always make sure there are not other OBD2 full scan DTC errors of any kind whatsoever first.
any thing that can lie about RPM,
LOAD
Temperature (on my wife jeep it delays many thing even if the trans temp sensor reads wrong) on your car the ECT is that sensor. engine temp.
and speed and load and RPM and others.
if the TCM SECTION gets errors from the engine RPM (this is Tranny input rpm #1, and most not be wrong)
then the tail shaft sensor on the transmission , TAIL RPM that is. (is MPH too, the PCm computes speed off axle gears and RPM)
or the ENGINE LOADS work say the MAF sensor is telling lies, that equates to load, and will confuse any TCM.
the TCM (is part of the PCM) the TCM also looks at throttle angle (TPS) if this is wrong, the TCM will get confused.
the transmission also has kick=down cable what it is bad or set wrong, would would the TCM do, well I will tell you, TCC will fail. as that cable is passing gear cable, means driver
wants to go faster, or pass or accelerate and the TCM takes the TCC off line, in 1 second flat or disables it.
this is how TCM work, if you study now it works you will begin to see it is anything but simple.
I hope my post is singing to the Choir.
lets work 12vdc never makes it to SOL1.
wire cut to it?
TCM bad (means PCM bad they are all in one)
ECT bad.
engine thermostat bad, engine runs cold, TCM does not like that
Kickdown cable jammed, or set wrong, and TCM can not understand what to do , with the gross error condition. (it thinks, gee why does driver always wanting pass on the highway)
TPS bad. reads wrong or calibrated wrong.
ENgine load reported wrong to the TCM side. (lots of causes)
Engine RPM wrong, reported to TCM side (not likely but must be on the list of inputs) is engine misfiring? DTC+ P03xx codes>?
Does any speed sensor read wrong, the VSS1 or VSS2, VSS1 is n tail of trans, VSS2 is inside MPH gauge. VSS2 is backup sensor for the trans.
MAF reading wrong shows load (air flow) too high for REALITY. (most times its too low and just a dirty maf )
That is all I can think of in a tight list. and #2 fails above.
what if the PCM saw loads to high
lets say the an axle bearing is going bad, and the 95 HP at the flywheel is not making it to the tires and road
but is making only heat with a seizing bearing.
The PCM sees load way too high for speed, X and cuts THE TCC as the tables for TCC show.
The PCM reports, LOAD, with the scan tool. you can see if load is to high. live scanned in motion.
now the chart (not all that good but all we have)
as you can see there is no TCC on on heavy loads. (load can be MAF air flow + TPS angle and for sure kickdown cable)
the kick cable cause fluid leak in the main shifting gallery line, this cause later shifts this leak, (valve) later shifts, means 3rd gear is later
![[Image: 4sp-power-button2w.jpg]](http://www.fixkick.com/tranny/slush/4sp-power-button2w.jpg)
1:
have you measured the coil resistance? on the SOL1?
the OHMS, connector pulled.
2:have you measured the voltage on that pin, with jumper wire (sol1) to a cab voltmeter (dmm) to see if you get 12vdc at the TCC lockup moments? (be wise to do that)
OMG i never get 12vdc there, at any speed on flat ground.
what not it be a shame to rip a trans to 100 of pieces and later find it was not in the box. at all, we have like 10 posts where folks did that. (on other forums vast post)
the #1 reason why (the owners thinks DTCs tell you what part is bad, and nothing can be further from the truth)
(have you cleaned the rear VSS sensors yet, clean off that mud (metal mud it is) clean it off now. costs nothing to clean hall sensor at all, just do it,
learn that the PCM loves to hide errors,. until you do 3 trips(key on trips) this fools so many folks this fact. (hint always scan driving full speed at TCC chart stated conditions see of PENDINGS SHOW ERRORS OF ANY KIND < IN MOTION (hint2 it takes 2 persons or own a real scanner that can log data)
if number 2 fails, the TCM is bad not the TCC SOL1. (or the below called TCM inputs wrong, lots)
The TCM is a brain, a computer, in this case its (2nd process in the PCM)
the TCM also has limphome mode, and ends the TCC feature .
the TCM is scanned with the OBD2 full tool a real scanner that can see all DTCs of any kind are present for sure in motion, ECU side and TCM side of the PCM.
a full scan may show other TCM errors you missed. or engine issues, (sensors etc) did you know some many sensors reading wrong can cause TCC failure.(by design)
the TCM has 2 modes, normal and limphome.
in limphome it also skips , 2nd gear.
I will not pretend to know how ever line of code behaves in your PCM firmware, (nobody does) but will say this is a good list, if you study TCMs serious.
I always make sure there are not other OBD2 full scan DTC errors of any kind whatsoever first.
any thing that can lie about RPM,
LOAD
Temperature (on my wife jeep it delays many thing even if the trans temp sensor reads wrong) on your car the ECT is that sensor. engine temp.
and speed and load and RPM and others.
if the TCM SECTION gets errors from the engine RPM (this is Tranny input rpm #1, and most not be wrong)
then the tail shaft sensor on the transmission , TAIL RPM that is. (is MPH too, the PCm computes speed off axle gears and RPM)
or the ENGINE LOADS work say the MAF sensor is telling lies, that equates to load, and will confuse any TCM.
the TCM (is part of the PCM) the TCM also looks at throttle angle (TPS) if this is wrong, the TCM will get confused.
the transmission also has kick=down cable what it is bad or set wrong, would would the TCM do, well I will tell you, TCC will fail. as that cable is passing gear cable, means driver
wants to go faster, or pass or accelerate and the TCM takes the TCC off line, in 1 second flat or disables it.
this is how TCM work, if you study now it works you will begin to see it is anything but simple.
I hope my post is singing to the Choir.
lets work 12vdc never makes it to SOL1.
wire cut to it?
TCM bad (means PCM bad they are all in one)
ECT bad.
engine thermostat bad, engine runs cold, TCM does not like that
Kickdown cable jammed, or set wrong, and TCM can not understand what to do , with the gross error condition. (it thinks, gee why does driver always wanting pass on the highway)
TPS bad. reads wrong or calibrated wrong.
ENgine load reported wrong to the TCM side. (lots of causes)
Engine RPM wrong, reported to TCM side (not likely but must be on the list of inputs) is engine misfiring? DTC+ P03xx codes>?
Does any speed sensor read wrong, the VSS1 or VSS2, VSS1 is n tail of trans, VSS2 is inside MPH gauge. VSS2 is backup sensor for the trans.
MAF reading wrong shows load (air flow) too high for REALITY. (most times its too low and just a dirty maf )
That is all I can think of in a tight list. and #2 fails above.
what if the PCM saw loads to high
lets say the an axle bearing is going bad, and the 95 HP at the flywheel is not making it to the tires and road
but is making only heat with a seizing bearing.
The PCM sees load way too high for speed, X and cuts THE TCC as the tables for TCC show.
The PCM reports, LOAD, with the scan tool. you can see if load is to high. live scanned in motion.
now the chart (not all that good but all we have)
as you can see there is no TCC on on heavy loads. (load can be MAF air flow + TPS angle and for sure kickdown cable)
the kick cable cause fluid leak in the main shifting gallery line, this cause later shifts this leak, (valve) later shifts, means 3rd gear is later
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