First thing that you will want to do is to see what trouble codes
are present. In your case, here's how you do it:
1.. Turn OFF the ignition for 10 seconds.
2.. Connect PIN 13 on the data link cable (DLC) to a ground. The DLC is
located in the cab under the instrument panel on the driver's side.
3.. Turn ON the ignition, with the engine OFF.
4.. Observe the transfer case shift control switch select buttons for
flashing codes. Refer to Diagnostic Trouble Code (DTC) List .
Important: If the transfer case shift control switch buttons all blink only
once and then stop, no fault codes are stored in the transfer case shift
. When one DTC is stored in memory, that code will blink that
number of times followed by a 3 second pause and then repeat.
. If more than one code is stored, the first code will blink,
followed by a 3 second pause and then the second code will blink.
. This sequence will continue until PIN 13 on the DLC is no longer
. If the TCCM will not communicate the presence or absence of
DTCs, test the above circuits in Self-Test Step 2. If the circuits are
complete, then replace the TCCM. Refer to Transfer Case Shift Control Module
Hmmmm....now you really have problems! I think
that the next step would be to see if you have
a mechanical problem, ie: you may need to remove
the encoder motor and see if you can manually move
the t/case into the 4hi position.
Induce a code ::
unplug the encoder motor
pull codes again
post the results
only a suggestion.......
in case of a real emergency..........
contact an authorized Dealer Tech..............
cuz..........he's liable to have a part on hand to chunk at it.........
sips his crown royal...wonders how the lights are reacting during mode
selection...and during code retrieval~
That 4x4 system used on that vehicle can be troublesome. It uses a NVG
233 NP1. NVG stands for New Venture Gear which is the new name for New
Proccess so just for referance, a NP233 and NVG233 is the same case.
Some styles of Tcases use a electroning clutch inside the Tcase to
engage front output and some do not and even my GM manual is not clear
about this on this model. I do have wiring diagrams and compontent
locations posted in my forum in members only area (I post them by
member request) and he is not the first one to have problems with this
system by any means.
Preliminary diagnosis indicates further diagnosis is
please elaborate on...............
" I 'made'.......it give me a code"
i'm lost, confused, disoriented, and do not know which way to go.
Did you simply use the code retrieval method Ian posted?
Did you do as I said and unplug it to "see" if a code would pop up?
i'm off to git that code def for you.......
rite after i burn this dooby..........first thangs first.
~grabs his lighter and hits the AllData button~
The diagnostics that accompany a code 2 on this transfer case
will tell you to test four circuits from the shift control module
to the encoder motor for the proper voltage, if they pass muster,
then you are off to test the encoder signal ground circuit for
open or high resistance.
In almost every case that I've worked on, a code 2 ends up
being an encoder motor failure. Now you can either follow
the diagnostics which isn't that hard, or you can try another
method that I often use. This is all under the assumption that
you simply didn't know how to retrieve the code the first
time around and your system always had the code 2 present.
Clear the codes using this procedure:
Diagnostic Trouble Code (DTC) Clearing
The transfer case shift control module is equipped with the ability to store
diagnostic information which is useful to a technician in the event of a
module, component or wiring failure. DTCs should not be cleared from the
transfer case shift control module until these codes have been recorded or
servicing the system has lead you to a repair and directed you to perform
the "Clearing Flash Codes" operation. The following steps provide an easy
way of clearing the flash codes properly.
1.. Turn OFF the ignition.
2.. Remove the 10 amp CTSY LP from the I/P fuse block, and the 20 amp ATC
fuse from the underhood fuse block.
Important: Replacing the fuse before the specified time may result in not
clearing the DTCs.
3.. Wait a minimum of 60 seconds before replacing the fuse. Once the fuse
is replaced DTC 1 will be set in the transfer case shift control module.
4.. Cycle the ignition switch from the OFF position to the RUN and back
OFF five times in order to clear DTC 1 from the transfer case shift control
5.. Verify that the DTCs have all been cleared. Refer to Diagnostic
Trouble Code (DTC) Displaying .
Please follow the procedure to the letter!
Now see if the system works properly, ie: does the transfer case
shift into all the ranges. If it does, you have an intermittantly
faulty encoder motor. If you get the code 2 back immediately,
then you will need to do the voltage checks and you may find
the problem is either wiring or the shift module.
I've even encountered a few vehicles where both the encoder
motor and shift module are faulty.
a quick method to test the circuit ALL the way TO
the encoder motor............
clear the codes as stated.......
use a current clamp on a DVOM while activating the
motor.......clamp around the ENTIRE harness
rite at the encoder motor.
if the signal is getting "to" the motor........
you've just eliminated EVERYTHING upstream of the
~sips his crown n coke.......and watch's his meter for
Then you've been given your options
fairly clearly, and by Ian, whom you
can bet on being balls-on accurate.
Check the circuits, or replace the motor,
or make sure the unit will go in 4wd Hi
(which is a pain in the ass in my opinion)
(and most likely NOT the problem)
re-read your thread, decide if you want
to diagnose or take a gamble on the most
I personally would slap a motor on it.....
It's your money, not mine.....and.....I could
always stick it back on the shelf.
and let us know.
Code 2 definition ::
Transfer case encoder motor fault
this is according to AllData.......
verified through TrNi online.
(still wondering if you "induced the code"...or not)
waiting on yer response to the previous q's........
and remember.....when money is not an object of concern.........
we always got that "chunk a part on it"
~sips his coffee.......wonders if yer perplexed yet....and if you have
patients to take all the diagnostice steps neccessary BEFORE.....
starting to chunk parts at the symptom~
A roller coaster of good and bad. Had a slight problem with my now
former G/F that lead to me being impounded, as well as my vehicle. Which
cost me a whole lot of green backs.
Work picked up after I got that mess taken care of. Then my computer
quit, bad hard drive. Slapped together another one to get me threw, it
died the weekend my new Dell arrived.
Bought another Ford Ranger this summer, and managed to kill it by
august. Broke the frame, yet had fun doing it. kept the dana 35 solid
front axle and the 38's for my other ranger. Bought a Diesel 85 Suburban
with 35's on it to trail ride in. (both can been see in my yahoo profile).
So how goes your blazer?
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.