Wont go into 4-wheel drive


Persistent One
06-20-2010, 06:31 PM
i have a 1997 s10 zr2 and when i push the button to put it into 4 high it just clicks and lights up the button then the light goes off and stays in 2 wheel drive

MT-2500
06-21-2010, 08:34 AM
233 transfer case?
If so you can ground pin 13 on the diagnostic connector and read out codes on shift button lights of 1-4.

Post back what the shift button lights do with pin 13 grounded key off and then key turned on.

Persistent One
06-21-2010, 03:45 PM
i did wat u said and all the lights stopped for a sec than they blinked 3 times and shut off until i took off the ground then the 2 wheel drive light came back

MT-2500
06-21-2010, 04:05 PM
i did wat u said and all the lights stopped for a sec than they blinked 3 times and shut off until i took off the ground then the 2 wheel drive light came back

3 blinks is a code 3.
Repair flow chart for that code says first check circuits between TCCM (transfer case module) and shift motor.
If they are OK replace shift motor.

And recheck for any other problems.
Good Luck and.
Let us know how it goes.

MT-2500
06-21-2010, 04:07 PM
Was that 3 blinks in a row or one blink and pause and blink and pause and blink

Persistent One
06-21-2010, 06:56 PM
its was a blink then a pause etc.

MT-2500
06-22-2010, 09:50 AM
I one blink and a 3 second pause and then one blink and 3 second pause it is a code 1.
If 3 blinks repeatedly and then a 3 second pause it is a code 3.
It should keep on blinking codes so keep watching and count blinks and pause.

Code 1 is lose of ram stand by power from fuse block to RCCM.

Check all fuses and FOR LOSE OF KEY OFF 12 volt RAM STAND BY POWER TO tccm also circuit from fuse block to TCCM.
If ok replace TCCM.
And recheck.
Good Luck and let us know how it goes.

Add your comment to this topic!