4wd system help
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New User
Joined: Sep 2015
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From: spokane
4wd system help
ok, so ive been trying to figure out this problem but none of the threads even hint to what my issue is. when i turn the 4wd switch on all i hear is a click. i've been through all the vac lines( no issue there) everything worked just fine the last time i used it. now it just clicks. hope i can get some insight into where to look. ps, no lights come on either.
Hotshot
Joined: Jul 2005
Posts: 11,931
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first thing that happens is the transfer case shifts to LO or HI... does that happen ? Even if you don't engage the front axle, there should be a gear reduction if the transfer case shifted .... no light normally means no shift.
If you don't go into LO when you shift, then I would check the motor / electrical plug / wires on the side of the transfer case. Pull the motor, set on a block, and then shift to see if it moves.
If you don't go into LO when you shift, then I would check the motor / electrical plug / wires on the side of the transfer case. Pull the motor, set on a block, and then shift to see if it moves.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Brian, there is a whole series of actions that take place your not awhere of.
The dash switch is the signal to a control module to initiate an action.
The module controls the case motor that engages the trans and front drive shaft.
Then a solenoid on the firewall routes vacuum to the front axle actuator pulling a sleeve that locks the front axle, then the lamp on the dash lights.
The click you heard is a relay that is trying to operate the case motor.
You need to find where the operation stops in that progression.
Vacuum only plays a part operating the front actuator either in or out.
Try to look at the case motor for an operation fault of some sort.
Good luck.
The dash switch is the signal to a control module to initiate an action.
The module controls the case motor that engages the trans and front drive shaft.
Then a solenoid on the firewall routes vacuum to the front axle actuator pulling a sleeve that locks the front axle, then the lamp on the dash lights.
The click you heard is a relay that is trying to operate the case motor.
You need to find where the operation stops in that progression.
Vacuum only plays a part operating the front actuator either in or out.
Try to look at the case motor for an operation fault of some sort.
Good luck.
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