no 4 wheel drive please help

[Mcgwirejh]

i have 1997 chevy z71 its push button 4 wheel drive when i puch the button to put it in 4 wheel drive the light just blinks i bought new frotn differental actuator still does not engage so i took it out left the wire hooked up it does not extended out im not getting no juice to the actutor for it to come out what can cause it to not get no juice going to it

[Mcgwirejh]

i have 1997 chevy z71 has push button 4wd drive i push the 4h button just flashs so i put new actuator in the front differential still does the same this so i tested the actutor there is no juice gonig to the actutor for it to come out what could be the problem

[ChevyTech]

If the lights are blinking, the TCCM (Transfer Case Control Module) could have stored a trouble code.

Have you attempted to retrieve trouble codes from the TCCM?

If a Transfer case motor position sensor code has been set, the TCCM reverts to a default mode in which only 2HI and 4LO are possible.

If you clear the code it may be able to shift into 4 high until it sets a code again.

You should try shifting it to 4Low and see is it can complete the shift to 4 low and engage the front axle. Whether or not it can shift to 4 low will help to determine where the problem is.

[Mcgwirejh]

dont know where to look for trouble codes but when i put it in 4lo the light blinks just liek it does in 4hi u can hear the transfcase shifting in 4lo and it revs up real high

[ChevyTech]

So did it make it into 4Lo and did the front axle engage?

Did you shift it back to 2 Hi and did it make it back to 2 Hi?

[Mcgwirejh]

the front axle never did engage

[Mcgwirejh]

i know the actutor is not working to engage the front axle i even bought a new actuator still does not engage the front axle like there is no power going to the actuator for it to come out and hit that rode in the front axle to engage it

[speedygonzales]

Check fuses in the IP fuse block.

[Mcgwirejh]

i checked fusses there all good

[ChevyTech]

There is an electrical switch on the transfer case next to the shift motor.

If the transfer case does not shift into 4WD, the switch will not be actuated.

If that switch has failed, even if the transfer case shifts into 4WD, the front axle actuator will not get power.

Check all the wiring.

If you are sure the transfer case has shifted, you could jump the switch and see if the front axle actuator gets power.

[Mcgwirejh]

yeah the transfer case is switching cause the drive line turns and when u stick it in 4hi it revs real fast and loud i saw 2 transfer switches which one would it be the one above the shift motor or the one in the back of the transfer tail shaft

[Mcgwirejh]

ops i mnean when i put in 4lo it revs fast and loud and the drive shaft turns so i know its going in 4wd in the transfer case

[ChevyTech]

The switch for the front axle actuator is by the transfer case shifting motor on the front side of the T-case.

The part you are probably looking at by the tail shaft is the vehicle speed sensor.

[Mcgwirejh]

is this what the switch look http://www.autozone.com/autozone/par...91_2180_13424_like

[Mcgwirejh]

so the transfer case switch send the power to the acutor for it to come out so do i need to buy new transfer case switch

[Mcgwirejh]

so sense im no geting any power to the actuator do i need to change the transfer case switch

[ChevyTech]

Yes; that looks like the transfer case switch.

There are so many things that can cause no 4WD.

I don’t suggest throwing parts at it.

You should sit down with a manual and start testing to see where there is power. It could be a fuse, broken wire, bad connector, bad switch, or a problem that the transfer case is not moving the switch.

Does power make it to the T-Case switch?

[Mcgwirejh]

how u test it if geting power to the t case switch