As for the answer to your query — sorry, I don’t have the foggiest as my Blazer doesn’t contain the “Vehicle” function. Ya gotta individual one of them fancy vans! You understand what I’d say though? If it ain’t broke, don’t touch it! Many thanks for your opinions!
switch nothing at all happins. Now After i set the truck in neutral almost nothing in 4hi but it will eventually drop by 4lo. Then I am able to press 4hi and it will go in. Then I'm able to return to 2 wheel. But the sole time I can perform any of this is when It's in neutral and at a whole cease. Any Thoughts. Many thanks
Yep, you either Possess a lousy TCCM, terrible encoder motor, broken vacuum lines, negative actuator or a problem with your transfer circumstance — all of that has been protected in this thread.
Daniel E Alkire says: March fourteen, 2008 at twelve:34 pm Your information and facts continues to be incredibly handy, Thanks. My program is performing just a little unique when compared to the postings I’ve examine. My annunciator “Support Four Wheel Push” arrives on about two seconds following the ignition swap is turned on then goes out while starting up the engine and arrives back again on as soon as the motor is functioning and the swap is unveiled.
The other wire I would Verify will be the A/T (Automatic Transmission) change lock swap — This is certainly wire #31 and is particularly light environmentally friendly with a black stripe (you'll find far more internet pages of the schematics higher than… the main is often a hand -written webpage with the TCCM connector pinout). This wire should have voltage placed on it at certain times — regrettably, I have never had to diagnose that Portion of the method, so I don’t know if it ought to be +5VDC or +12VDC (but It will probably be one of them!
It’s difficult to say what your difficulty is. I’d start with taking a look at the encoder motor — if you can listen to it run briefly, then what I'd personally do is just take it off the transfer case and check out to engage 4WD then — watch the motor and see what it does — check out it in all modes (2Hi, 4Hi, 4Lo) and watch the motor. If that seems to be OK, another detail I'd personally do is usually to try to manually change the TC Together with the “tab” That ought to now be sticking out from the side of the TC (underneath the encoder motor which you eliminated) — it Is that this tab which the encoder motor turns to have interaction the different modes.
one) you could pull on the cable to engage the travellers aspect hub — but it will disengage after you release it as vacuum Ordinarily holds the diaphram shut, which retains the cable, which retains the hub engaged.
If I’m not mistaken 1999 and back, the vacuum switch is in addition to the transfer scenario. 2000 and up it’s around the firewall. If it’s on top of the TC, it looks like a nut with 3 hoses sprouting from it.
Should you hear the clicking of your TCCM, that lets you know that the relays are Operating and are attempting to put the encoder motor in gear. There are numerous causes for this to occur, damaged/leaking vacuum strains to start. The encoder motor wires may be lousy. There's a “plastic bushing” that keeps a “fork” during the transfer scenario within the placement (properly, the fork keeps the gears in the proper position)… if the plastic bushing is worn, it can result in the transfer case to not switch (this happened to me, even so the signs or symptoms have been which the process would swap to 4Hi/4Lo, by using a massive clunk, and it had been very hard to get it back outside of 4WD.)
Variety seven has been the culpret in 2 of the blazers i have worked on its hardned metal so tend not to try to Visit THIS Site make 1 away from any washer it will fail. GM sells this washer in whatever they get in touch with a washer kit it incorporates seven, twenty, and 24. If any person has this problem its an easy deal with therefore you dont even have to get rid of the diff, just the axle tube, but youll have to get rid of the halfshaft 1st this fix took me just around one hour to finish.
My mechanic is struggling to align my front simply because he will not know how regulate aftermarket unibal A Arms. Must I visit a shop which has a Personal computer to show how to proceed?
System B… I’ll attempt my community electronics retail store and find out if I may get some of the female finishes (steel clips on the end of every person wire… you'll find about 30 wires, I didn’t truly count).
Up-to-date twelve/12/07 – I just wished to insert to this post that the TCCM has two relays in that Regulate the actual switching from the encoder motor — you which is Everything you listen to “clicking” if you try out to interact the 4WD method.
Great luck, and allow me to know very well what you find — while in the hope that it will aid some other person in the future.