4wd?
measure the solenoid coil resistance?
those are cheaper then any trans used or new
did you use a scan tool first, obd2 and see if there are P07xx code?
last is checking the voltage on those solenoid lines
see this.
see the 2 solenoid lines in the chart?
the logic is 0v and 0v for OD
so if one line is high 12v , for 4th then the tcm is bad or inputs to TCM are wrong
http://www.fixkick.com/tranny/slush/OD-f...0what.html
one input that can block 4th gear (od) is if the TCM thinkx your in 4wd even when not.
or engine load is excessive,
and say dirty VSS sensor, clean it>? scan it?
best is the scan tool like all newer cars,,,, check fuses ,then scan.
the tcm talks to PCM (no mater if seperate or not, and he pcm tells the Tcm ENGINE DATA.
LOTS OF INPUTS
TPS
vss
load
engine rpm
engine pcm in limphome
tranny is limhome mode(its not)
ect
and more
the transmission still has a kick down cable, not sure on sport, but this must not jam out, or may not upshift, thinking you want so called passing gear
cheers.
above is for tcm plugged in
i manual mode.
the D shift mode not picking 4th gear, in manual mode is pretty damning. unless cable is slipped. not really in D
but i wonder if a leaking solenoid valve can cause this...
hummm
not sure...
measure the solenoid coil resistance?
those are cheaper then any trans used or new
did you use a scan tool first, obd2 and see if there are P07xx code?
last is checking the voltage on those solenoid lines
see this.
see the 2 solenoid lines in the chart?
the logic is 0v and 0v for OD
so if one line is high 12v , for 4th then the tcm is bad or inputs to TCM are wrong
http://www.fixkick.com/tranny/slush/OD-f...0what.html
one input that can block 4th gear (od) is if the TCM thinkx your in 4wd even when not.
or engine load is excessive,
and say dirty VSS sensor, clean it>? scan it?
best is the scan tool like all newer cars,,,, check fuses ,then scan.
the tcm talks to PCM (no mater if seperate or not, and he pcm tells the Tcm ENGINE DATA.
LOTS OF INPUTS
TPS
vss
load
engine rpm
engine pcm in limphome
tranny is limhome mode(its not)
ect
and more
the transmission still has a kick down cable, not sure on sport, but this must not jam out, or may not upshift, thinking you want so called passing gear
cheers.
above is for tcm plugged in
i manual mode.
the D shift mode not picking 4th gear, in manual mode is pretty damning. unless cable is slipped. not really in D
but i wonder if a leaking solenoid valve can cause this...
hummm
not sure...
http://www.fixkick.com