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Your comment about moving into slippery conditions as well as 2Hi gentle goes out… the only thing I can imagine could be the TCCM (Transfer Scenario Handle Module) could have corroded wires, which was the first subject matter of this thread. Does this materialize mechanically once you get into slippery problems?
Each and every car or truck I passed inside the ditch, I just stored praying my 4 wheel push would come on… but no such luck. The actual pisser here is, I tried it that early morning and all was great… now, when I want it, nothing!
It only took a few minutes to Find the module and the problem was Plainly visible soon after removing the module from your body to possess a closer search. The wires/plug connector ended up badly corroded on a couple of pins — which led to two broken wires (pin #1, grey w/ black and pin #six, orange).
DISCLAIMER: You should Observe that I've mentioned several moments which i haven't examined any of what I've claimed in this article — I'm basically considering the problem logically even though thinking about the system schematics. Take a look at ALL WIRES prior to making use of electrical power to them.
Jodie Perry states: November 30, 2014 at nine:21 pm Engaged on a 2000 Blazer and acquiring precisely the same difficulty as many are Using the 4 wheel travel not engaging. I appeared on the web and discovered that the most typical challenge would be the transfer case vacuum swap. Following a lot of hours crawling underneath the Blazer and observing a lot of films on the location, I gave up and jumped back again online to discover what I'd missed. Evidently, I found out, that When you have the 4 button four wheel drive selector, you don’t Have a very vacuum turn on the transfer circumstance…..you have got the TCCM, an actuator as well as a vacuum actuator switch. I checked out the actuator in the beginning of the method along with the cable was free of charge and apparent. Went ahead and lubed it up once and for all measure at the same time.
It stumped my mechanics for quite a while — almost everything else was checked (they even purchased up areas for the front diff, and then despatched them again) and everything appeared good. The transfer circumstance was the last thing they checked out (don’t ask me why — I suppose the signs or symptoms don’t place to it).
Incidentally, the dealer told me that 4Lo generally can not be turned on Except if you set the auto while in the neutral. If by some means automobile goes into 4Lo by itself, just set it in the neutral position, and you can swap out 4Lo.
Very well, that’s about all I am able to think about at this time — if I imagine anything, I’ll update this write-up.
Weak connections anywhere along the route will lead to troubles — most times intermittently, that are a true PITA to seek out. (See my earlier mentioned posts for resolving this problem.) The TCCM might be poor in addition.
The flashing light-weight signifies the program is trying to enter that manner. If it stops flashing just before it does, there was a dilemma attending to that method. However, I’d say cease driving it and have it to some mechanic ASAP, if you cannot further more diagnose the problem.
Besides that, you'll find a few sensor switches — 1 to detect When the front axle is engaged of course — which may be a reason behind failure (In case the sensor says something will not be proper, it will eventually kick it back again out of 4WD and into 2Hi). Where they are located, I’m not a hundred% — In particular on the ’ninety Visit This Website five.
). Then, I’d maybe mention the forks/gears/plastic problem for your mechanic and he may be able to exploration it extra. Don’t hold your breath on a remember nevertheless — if it’s not a safety concern, and it lasts a lot more than your warranty period, it’ll under no circumstances get recalled!
Actually, I'm stunned it engaged as if I bear in mind effectively, the vacuum switch communicates While using the TCCM and customarily will cause the sprint switches to flash if no communication is obtained. It has been some time given that I labored on this motor vehicle although (and bought it in ’07), so I could possibly be mistaken.
I've an ’02 Chev 2500 having a manuel 4X4 shifter. My issue is 4hi received’t engage. 4lo seems to operate just wonderful, axle engages, lights to the sprint occur on, I'm able to listen to front axle actuator partaking, but when I check out 4hi very little appears to occur.