2006 4x4 Repair Help
12-28-2016, 10:45 PM
#11
seems like it should work, but I think the earlier ones ('97-'03) worked just the opposite. that is why I asked if it had a rain hat, the one you took off may have
failed and the one you put on may be wrong. ck. the engineering numbers on them
failed and the one you put on may be wrong. ck. the engineering numbers on them
12-29-2016, 12:29 PM
#12
ok made some headway today.
removed the cabin rotary switched and ohmed it out. it matched the values i read in another post so i believe the switch is functioning properly.
my right iwe actuator is stuck engaged. with vacuum applied, it remains engaged and the half shaft and driveshaft spin when the tire/wheel spins.
my left iwe actuator performs as it should, with vacuum applied the wheel freely spins but with vacuum removed the half shaft and driveshaft spin.
with the front jacked up and the switch in 4 HI, i can still turn the front wheels along with the front driveshaft.
when i crawl under the truck i cannot hear or feel any change in the transfer case motor when switching between 2 and 4wd modes. i have already replaced the TCM so this leads me to believe it is a PCM or wiring issue.
now, for the iwe solenoid. i removed it from the truck and manually applied 12V to it. I heard and saw the solenoid actuate with the voltage applied. i then measured the electrical connector under the hood and measured 14V when the switch is in 2wd and both 4wd modes. meaning, voltage is not changing when i turn the switch between drive modes.
so manually under 11.94 voltage, the solenoid actuates, with 14V, it does not.
the combination of the TCM not engaging and the solenoid being fed a high voltage makes me lean towards a PCM issue rather than a wiring issue.
can anyone help me with the next step? how do i test the PCM or can I replace it myself? is there a specific one for 4x4 or is it the pcm for the whole truck.
if there are still fuses or relays to test in someone's opinion i can do that as well, it just seems like i wouldnt be getting the 14v at the solenoid if it was a fuse issue. perhaps the TCM issue could be a fuse/relay as it does not seem to have power at all.
help, please...
removed the cabin rotary switched and ohmed it out. it matched the values i read in another post so i believe the switch is functioning properly.
my right iwe actuator is stuck engaged. with vacuum applied, it remains engaged and the half shaft and driveshaft spin when the tire/wheel spins.
my left iwe actuator performs as it should, with vacuum applied the wheel freely spins but with vacuum removed the half shaft and driveshaft spin.
with the front jacked up and the switch in 4 HI, i can still turn the front wheels along with the front driveshaft.
when i crawl under the truck i cannot hear or feel any change in the transfer case motor when switching between 2 and 4wd modes. i have already replaced the TCM so this leads me to believe it is a PCM or wiring issue.
now, for the iwe solenoid. i removed it from the truck and manually applied 12V to it. I heard and saw the solenoid actuate with the voltage applied. i then measured the electrical connector under the hood and measured 14V when the switch is in 2wd and both 4wd modes. meaning, voltage is not changing when i turn the switch between drive modes.
so manually under 11.94 voltage, the solenoid actuates, with 14V, it does not.
the combination of the TCM not engaging and the solenoid being fed a high voltage makes me lean towards a PCM issue rather than a wiring issue.
can anyone help me with the next step? how do i test the PCM or can I replace it myself? is there a specific one for 4x4 or is it the pcm for the whole truck.
if there are still fuses or relays to test in someone's opinion i can do that as well, it just seems like i wouldnt be getting the 14v at the solenoid if it was a fuse issue. perhaps the TCM issue could be a fuse/relay as it does not seem to have power at all.
help, please...
12-29-2016, 03:06 PM
#13
without pulling codes and doing diagnosis by the book I fear you will be throwing
money away. A failed pcm is possible since that is what ultimately controls this
system (4x4 module is built in). unfortunately you can't just swap out a pcm as
they are programmed vehicle specific, vin numbers are encoded into the modules
and all modules have to show a match for things to work.
I forgot again you said no codes, but sometimes you need a very expensive or
vehicle specific scan tool. if it won't scan 4x4 module or that is not a choice on
your scan tool you need one that has that capability. As someone said besides
a iwe or vacuum failure most issues with these trucks are resolved with a shift
motor and/or solenoid. sometimes codes have to be cleared before the module
will attempt to execute a shift.
money away. A failed pcm is possible since that is what ultimately controls this
system (4x4 module is built in). unfortunately you can't just swap out a pcm as
they are programmed vehicle specific, vin numbers are encoded into the modules
and all modules have to show a match for things to work.
I forgot again you said no codes, but sometimes you need a very expensive or
vehicle specific scan tool. if it won't scan 4x4 module or that is not a choice on
your scan tool you need one that has that capability. As someone said besides
a iwe or vacuum failure most issues with these trucks are resolved with a shift
motor and/or solenoid. sometimes codes have to be cleared before the module
will attempt to execute a shift.
Last edited by greasyknuckles; 12-29-2016 at 03:12 PM.
12-29-2016, 03:51 PM
#14
Correct I have no codes.
I have a new solenoid and transfer case motor. I have fully functioning iwe actuator and one that I will replace.
I have no explanation as to why my new solenoid and transfer case motor won't work... I would think this is something systematic.
I have a new solenoid and transfer case motor. I have fully functioning iwe actuator and one that I will replace.
I have no explanation as to why my new solenoid and transfer case motor won't work... I would think this is something systematic.
12-29-2016, 09:59 PM
#15
without pulling codes and doing diagnosis by the book I fear you will be throwing
money away. A failed pcm is possible since that is what ultimately controls this
system (4x4 module is built in). unfortunately you can't just swap out a pcm as
they are programmed vehicle specific, vin numbers are encoded into the modules
and all modules have to show a match for things to work.
I forgot again you said no codes, but sometimes you need a very expensive or
vehicle specific scan tool. if it won't scan 4x4 module or that is not a choice on
your scan tool you need one that has that capability. As someone said besides
a iwe or vacuum failure most issues with these trucks are resolved with a shift
motor and/or solenoid. sometimes codes have to be cleared before the module
will attempt to execute a shift.
money away. A failed pcm is possible since that is what ultimately controls this
system (4x4 module is built in). unfortunately you can't just swap out a pcm as
they are programmed vehicle specific, vin numbers are encoded into the modules
and all modules have to show a match for things to work.
I forgot again you said no codes, but sometimes you need a very expensive or
vehicle specific scan tool. if it won't scan 4x4 module or that is not a choice on
your scan tool you need one that has that capability. As someone said besides
a iwe or vacuum failure most issues with these trucks are resolved with a shift
motor and/or solenoid. sometimes codes have to be cleared before the module
will attempt to execute a shift.
12-29-2016, 10:48 PM
#16
yes it has to be programmed. get the pcm, take to dealer, have them install and
program it. the truck won't run if you just swap them. the IDS (scan tool) will take
all the info from the pcm and put it in the new one. should be about 1-1.5 hrs labor
program it. the truck won't run if you just swap them. the IDS (scan tool) will take
all the info from the pcm and put it in the new one. should be about 1-1.5 hrs labor
02-17-2017, 06:46 PM
#19
is there a special control module for 4x4 or just the one PCM against the firewall on the passenger side. i just want to make sure i replace the right module, the only one I am aware of is the one shown in the video below.