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NP 246 Encoder Motor

My 96 would have the front end stick in the engaged position. I think most of my issues came from a wreck I was in where the passenger front wheel was hit pretty hard, it fractured a thrust washer in the engagement mechanism. I was also told that I needed to see if the driver's side output shaft had slop as that was a sign of the bearings going out and if did that could be a possible cause for sticking in gear.
 
ak diesel driver said:
My 96 would have the front end stick in the engaged position. I think most of my issues came from a wreck I was in where the passenger front wheel was hit pretty hard, it fractured a thrust washer in the engagement mechanism. I was also told that I needed to see if the driver's side output shaft had slop as that was a sign of the bearings going out and if did that could be a possible cause for sticking in gear.
Click to expand...

Well the front axle is locked. The actuator is not working. It's never been wrecked as you've described.

I need some test suggestions on the plug to the actuator. Otherwise, I'll just order a new one.
 
You should have the electric version. If you unscrew it and it unlocks the axle it most likely died in the extended position. Most of our trucks came with a TLA thermo linear actuator and when they failed the axle would be unlocked.
 
I don't have the pinout anymore for the actuator, but there is a power, ground, trigger wire that is grounded to tell the shift motor to extend and engage the diff, and another wire that tells it if the front axle is engaged or not.
 
Alright, fixed the 4wd actuator. An electrical prong was bent down in the plug socket on the actuator. Straightened it out and it's working. Test drove it and it's working, but still no 4Lo so that's another issue to deal with.
 
Found this method of pulling codes for the transfer case:

For the newer style electronic 4x4 systems in vehicles with OBD-II systems and the shift button between the instrument panel and the radio/HVAC control stack:

The diagnostic trouble codes are displayed on the three transfer case shift select buttons. The shift select buttons are located on the instrument panel. When the connector pin 13 on the data link cable is grounded, and the ignition switch has been OFF for at least five seconds prior to positioning the ignition switch to run the shift select buttons will blink various times together in order to indicate a diagnostic trouble code from 1 to 4.

Position the ignition switch to OFF. Ensure the ignition switch is positioned to OFF for at least 6 seconds.

Connect pin 13 on the data link cable to a vehicle ground source. The data link connector is located in the cab under the instrument panel on the drivers side.

Position the ignition switch to RUN.

Note the shift select buttons for blinking codes.

If the shift select buttons all blink one time and stop, and do not continue to blink, no fault codes are stored in the TCCM. The transfer case shift select buttons will blink in order to identify any stored DTC. If only one code is stored in the TCCM memory, that code will blink repeatedly with a three second delay between blinking sequences. If more than one code is stored, the first code will blink once, then after a three seconds delay, the next code will blink. This sequence will continue until pin 13 is no longer grounded.

When reading the diagnostic trouble codes, the number of shift select buttons blinks will indicate the code number.

Diagnostic Trouble Code (DTC) 1
When the ignition switch is positioned to RUN the TCCM test to determine if RAM standby Power (maintained battery power) to the TCCM was lost since the ignition was last turned OFF. When power is interrupted on pin C6 of the TCCM, the TCCM stores a loss of RAM standby power.

Diagnostic Trouble Code (DTC) 2
During electronic shifting, the TCCM check the motor/encoder for normal operation. If the motor/encoder does not function correctly enough times, the TCCM stores a motor/encoder failure DTC 2.

Diagnostic Trouble Code (DTC) 3
The TCCM performs a test each time the electronic-shift motor is turned ON or OFF. If the motor does not function properly the TCCM stores a motor circuit failure DTC 3, and the shift select buttons blink in order to inform the driver of a problem.

Diagnostic Trouble Code (DTC) 4
Each time the ignition is turned ON, the TCCM tests the memory, the program, and the internal system in order to ensure that the TCCM is operating properly. If the TCCM detects a fault within the TCCM, the TCCM stores a RAM/ROM memory failure (DTC) 4.

When the TCCM is running a diagnostic, and a code 4 is displayed by the shift select buttons, replace the TCCM/
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Good luck and keep us posted.
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