1995 jimmy 4x4 problems

12-21-2009, 08:16 PM
no 4 wheel drive working this winter in my 1995 jimmy, I have a 96 for parts,tried replacing the 4x4 push button on the dash and replaced the acuator that is under the battery tray that goes to the front differentual,still no luck,any help would be great, because I have another one with all the parts I need to take off,thanks

12-22-2009, 10:53 PM
1. Have you checked fuses?

2. Does the actuator under the battery have vacuum applied to it, (engine at idle) when shifting into 4WD?

3. Does the actuator under the battery pull the cable when shifted into 4WD?

4. Do the 4WD lights blink when you try to shift into 4WD?

5. Does the TCCM (Transfer Case Control Module) click when shifting into 4WD? (located behind passenger side kick panel.)

6. Can you hear any noises from the transfer case when shifting into 4WD?

12-22-2009, 11:13 PM
1 i checked the fuses first -easiest thing first
2 replaced acuator
3 lights blink into each except 2 wheel has no light when in it
4 replaced switch in the dash
5 replaced tccm
6 transfer case makes noise when trying to switch
was wondering if it is the vacuum switch or encoder on the transfer case?

12-23-2009, 04:51 PM
Is there vacuum at the actuator when shifted into 4WD with engine idling?

Does the actuator pull the cable to the right front axle shaft when shifted to 4WD? There is a switch at the right front axle shaft housing that tells the TCCM if the axle is locked in. If it's not locked, the TCCM will not allow the encoder to shift into 4WD and the light will blink.

The vacuum switch on the transfer case has 3 vacuum lines to it: One from manifold vacuum. One goes to a vent, usually attached to the transmission dipstick tube near where the dipstick goes in. And one goes to the vacuum actuator. If the switch seal leaks, it will suck transfer case fluid into the lines and must be cleaned out and then replace the switch.

The encoder could also be the problem, as could the clutch mechanism on the right front axle shaft. You can raise all 4 wheels off the ground, transmission in neutral, then manually pull the cable to see if the axle locks in.

Post your results.

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