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I cleaned the TCCM contacts, then was ready to listen to it click, but alas, the four HI and four LO lights flashed when I tried to engage them. Rats! Action two, checked many of the fuses.. All Okay, then identified a damaged actuator vacume tube damaged near the actator itself.

Jim suggests: February 25, 2008 at four:07 am Perhaps you may help me. Today I left for get the job done and my truck was in 2HI. About five minutes down the road no lights were on, in my 4×four turn on the dash. I pushed the 2HI button and it lit right up. My truck does go into 4LO as I can hear and experience it partaking. My truck also seems to go out and in of 4HI and 2HI.I discovered a ice place around the pavement and if its in 2HI it'll spin , but when I strike 4HI I hear a slight clunk and it'll consider off like its in 4HI.

Just after cleansing up the corrosion on all remaining wires, and cleaning out the primary connector, I stripped and attached new clips to the two broken wires and stuck them in the principle connector. Okay, now I just require to be sure they don’t get pushed out in the event the link is designed… how?

The transfer situation With this car or truck is weak — it's a structure flaw in it with the manufacturing facility. There is a “fork” (for lack of a better time period) that has a plastic bushing while in the TC that wears out and will allow the gears to drift — mine had been just replaced (the forks have already been redesigned) with only a few hours on them. Actually, mine had been worn so bad which the gears were rubbing the case and might have rubbed throughout the TC, had I left it as is, inside the very near long term.

As I've said again and again throughout the three webpages of this submit… all the things that I know about the Chevy 4WD system continues to be posted here. I haven't any further information and facts to offer. I am NOT a mechanic.

Daniel E Alkire claims: March fourteen, 2008 at 12:34 pm Your data is very beneficial, Thanks. My method is performing a little distinctive compared to postings I’ve examine. My annunciator “Assistance Four Wheel Drive” will come on about two seconds after the ignition change is turned on then goes out though commencing the motor and arrives back again on when the engine is operating as well as change is introduced.

Hmmm… my to start with believed is that it's a wiring dilemma. Why? Just because you'll be able to confirm the program will work by Placing it into 4Lo. If you can get the method into 4Lo, that tells me the TCCM is Doing the job (or no less than the 4Lo aspect is), the encoder motor is Doing the job, along with the vacuum is Performing (the front Visit This Website hub is participating — the vacuum switch and diaphram are Performing). I’d Check out the wires would be the TCCM 1st, then perhaps the encoder motor up coming.

You will find a schematic (on page 1) in the front axle switch — it seems to become tied to floor by means of a “pull-down” resistor. When engaged, it ought to be pulled high (+5VDC or +12VDC, I don’t know what it’s utilizing for that swap).

Guest states: December 16, 2008 at 6:41 pm very well i brought my truck in and instructed them they could substitute the encoder motor, undecided what was particularly Mistaken with it, they explained it was enguaging only half way then kicking back again out. perfectly unsure what could result in this, i asked them to examine all wires into the tccm and find out If your wiring may be the situation, plus they said that if they fastened my tccm very last 12 months they ought to have also changed the encoder motor.

Nicely, that’s one which I haven’t read yet. The “ATS” fuse (that is marked “ATC” on this schematic) materials 12VDC to 2 significant orange wires at the TCCM (marked as pins C18 and C19 to the schematic). As I claimed, I haven’t viewed this issue ahead of, so I haven’t traced that Component of the method. I am able to only assume (yeah, I am aware!) that the simply because these wires provide 12VDC, These are utilized to operate heavier factors such as the encoder motor (5VDC, and that is the light guage orange wire, is utilized for logic — ie. to operate the “chips” about the circuit board). Ideally, you could see where I’m likely using this. I’m just making an attempt to consider it logically — Should the fuse is blowing that materials 12VDC, what inside the 4WD technique would use 12VDC?

In case you listen to the press on the TCCM, that informs you that the relays are Functioning and are trying to put the encoder motor in gear. There are plenty of reasons for this to happen, broken/leaking vacuum traces to get started on. The encoder motor wires can be bad. There is a “plastic bushing” that keeps a “fork” within the transfer case during the position (properly, the fork keeps the gears in the appropriate placement)… When the plastic bushing is worn, it might cause the transfer case to not switch (this occurred to me, however the signs or symptoms had been that the system would swap to 4Hi/4Lo, by using a significant clunk, and it was very hard to receive it back again outside of 4WD.)

The road could be a bit rough. Between each day driving, potholes, curbs and also your car or truck's age, the need for any wheel alignment is very common. On the extremely minimum, your automobile ought to get an alignment Test annually or each and every twelve,000 miles.

As I reported, I haven't examined any from the button wires, as I haven't had that specific challenge (still) — so, before you decide to do that, you will want to validate what I'm declaring is real.

Actually, it feels like the system is checking the neutral switch and will only actuate in neutral. 4Lo is purported to function by doing this, but 4Hi should really activate the fly.