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SUVs GMC Jimmy GMC Jimmy 4WD Problems
199 messages, Last post on Nov 05, 2009 at 10:35 AM
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I have a 2000 GMC Jimmy SLT that I purchased knowing the 4WD didn't work. Afetr the sale I put it in a small,private shop and they said (if I understood correctly) that an ABS sensor was out of alignment and something about a bearing was not allowing it to go into 4WD. They fixed it and after I left I tried it out. It now goes into four wheel drive but the following occurs. 1.If you press 4 Hi from 2 Hi.....the 2 Hi light goes out and 4 Hi light blinks but does not stop blinking although 4WD is engaged(I can feel it while turning). 2.When selecting the Auto 4WD button the Auto light starts blinking and instead of being in the 4WD "on demand" mode it goes directly into 4WD. 3.No code or check 4WD lights appear on the dash. The repair facility had closed for the day when I discovered all of this and I plan on going back but I just wanted some ideas as to the problem before I do. Thanks for any help.
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Replying to: rcf (May 02, 2006 10:21 pm) The front hubs each have an ABS sensor in the 1 piece hub for the ABS and Autotrac (only 4wd mode effected) to work. The rear sensor is in the transfer case. The passenger side front axle has a coupler that engages the axle to the front differential when any 4wd mode is activated and a sensor tells the TCCM computer in the cab located in the pass side kick panel its engaged. That axle has a vac actuator under the battery that is vac activated and it pulls a cable from it to the axle. 99up have an additional electric switch for the vac mounted on the firewall. CHECK all vac hoses from the intake to reservior (in drivers front fender) to the firewall switch, to the actuator under the battery (5/32 small and 7/32 larger). Note that both front axles CVs always turn as well as front drive shaft. Thats covers Autotrac and 4Hi. For 4Lo the transfer case has an encoder motor that is on the transfer case that engages a lower gear when you stop, put trans in neutral and push 4 lo and a clunk is heard. Again a sensor on the transfer case to tell TCCM it is engaged. Hope that wasn't too confusing. Blinking dash light means the sensor did not work/actuator did not work/ or the TCCM computer is confused - yes it can happen. After you check all operations try and disconnect the battery for 30 min and then retry and that should have cleared any error. Finally, check the front diff fluid and make sure its full and the transfer case requires blue autotrak II GM fluid - this has a GM bulletin on it so do not use Dexron red in it due to the clutch packs in yours. |
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my 98 jimmys lights flash when you try to put it in 4wd but doesent engage. the only way I can get it to engage is to put it in neutral hit the low lock button and while its flashing put it back in gear. but it will only go into low any suggestions?
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Replying to: reddog719 (Aug 05, 2006 5:27 pm) Assume 3 button 4wd (no Autotrac): 1. Check the vac hoses from the untake over to the reservior and T off to the actuator under the battery tray. 2. Chack the actuator (crawl under the pass side front) by looking /listening to see it the cable pulls the axle coupler. 3. Check the front axle coupler sensor(wires to it) by unscrewing and pushing the ball in) which tells the TCCM or 4wd computer that the axle is coupled for all 4wd modes. 4. Check the similar sensor on the transfer case for the encoder motor that engages the low gear for 4LO. 5. Check all connectors are tight and wires not cut all the way to the transfer case. 6. Disconnect the battery for 30 min and see if the TCCM reboots (must be a windows system - thats a joke) cause often this does fix it as it hangs up. |
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I bought a 1986 blazer and having vibrations and leaks fluid.I changed transmission fluid I am thinking it may be transfer case. I have enabled 4xhigh and have been driving around for a short period time. Is this a good idea to loosen up gears,etc.? This is my first 4x vehicle.
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Replying to: larenz71 (Aug 17, 2006 10:48 pm)
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Replying to: repairdog (Aug 19, 2006 10:52 am)
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Replying to: lskarvan (Aug 20, 2006 9:16 am)
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| I have tried a new motor , light just flashes and won't go into 4 high or low. I also had a brain box from a junk yard and 2 wheel drive just flashes and won't go into 4 high or low. I can take motor off and put in 4 wheel drive by hand, so I know the acuator works. | |
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Replying to: repairdog (Aug 20, 2006 1:25 pm) |
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