1994 GMC Jimmy Q&A
1994 GMC Jimmy Question: 4-wheel goes out at times .works again if disconnect power and let reset.why?
I have plowed my drive all winter with it but @ any given time 4 wheel goes out but switch is still on . Disconnect batt. cables and waite a few minutes and then fine for while.Happens more often and afraid to take it over the road to plow.It has push button 4-wheel but when it goes your done, no traction anywhere and seems only one wheel enguaging. - Ryedoc
scan codes and post so we can adv - globalhelper
This system uses vacuum to actuate the four wheel drive. Most common problem is the 3 prong vacuum switch at the top of the transfer case 3 vacuum hoses go to it. By unhooking the batt. it just goes through the 4x4 engage motion again until vac. is lost again. Next is vacuum supply circuit and then under the battery tray, a servo that pulls the cable to engage the front diff. Not much problem with transfer case switching motor or cable to front diff. This is just what i have run upon on these vehicles in the past. Could be totally wrong, but may be some help also! - pushrod