just one code, and not tranny shifting issues>?????????????????????
why blame the PCM firs
t, its dead last, then say that again.
why blame the most expensive part one car (elect)?
the PCM is just a computer s, and as such all puters, make errors
if the inputs are wrong,or the output actuators are stuck (bad)
THIS PCM now has the TCM on board, the tranny brain is just , more pins , an more software moved RESIDENT. ot PCM (ECU to PCM)
the FSM shows the test for each failure how to prove what is bad.
ever seen the big book??? alldata.com is good sub.
751 is tranny issues,
so replace the ECU for $500 to 1000.>???
then what? ???
back to doing the job right first time. sure. (it's your cash)
one if the big fallacy's in the net
is not using real FSM pages for those codes. it can vary by engine type and tranny models. (and for sure not ford !!!)
so did you really look them up?
the internet (bad) says 751 is switch bad, is it?
oddly (im a skeptic like all good techs are) it says 5min, rule
on the net, so tell me how does TCM even know you pushed it.
odd huh? or when, answer, IT CANT. It cant see your finger, not today, not yet, maybe 2015.??? LOL>>>>>
well that page lies....(the top page google hits) shock , gobsmack me... its really solenoid A.
to fix cars, you must learn (engine eFI) you must learn to think like a PCM, if not, you will fail. I promise.
lets work that idea........
the internet is great but it does mix codes, in to a toxic soup of trash.
enter Mr. FSM factoids.
A/T Low/Reverse Solenoid Circuit Failure
Number of Trips to Set Code:
Trouble Code Conditions:
Key on, and the PCM detected an unexpected voltage condition on the L/R Solenoid control circuit after the solenoid was enabled and disabled (the PCM checks for an inductive spike)
- L/R solenoid control circuit is open or shorted to ground
- L/R solenoid control circuit is shorted to system power
- L/R Solenoid is damaged or has failed
- TCM or PCM has failed (nah) x10
note that very very good word there, INDUCTIVE spike
the PCM switches the coil ON< then off.
then measure the BACK EMF inductive spike
if its weak that SPIKE, the coil is bad, or wires cut.
it's that simple.
last dead last is PCM never first. and i bet its not the PCM. !!!
id check the wires first and connections for imperfections.
then i check that coil, for ohms , shorted coil, open coil;
or even shorted to case. (tranny case.)
i make darn sure the trannsmission case is not missing its ground strap
,if yes, all is hopeless.... IT MUST BE THERE. and good.
i have a LCR meter in my shop and can measure the inductance on each shift coil for same readings,
if the coil shorts turns inside, it can fail for INDUCTANCE checks.
a spark solenoid , new can help you see right from wrong, so easy.
INFINITY IS BAD coil. if all coils read 25ohms (guess) and one is 15
log in to alldata.com
and read, see those facts. there?
the FSM real is deeper, it does itstsy bitsy steps, for checking that solenoid.
point 2, the PCM can see a working soleniod fail before its hard fails
see why? answer, the coil is working but is partially shorted.
that is how coils work , they must be perfect and not have turns shorted. say 1/8th of the windings gone. or more.
ask more questions,.....