Well, Allow’s start with the most obvious trouble — the “leaking air” sound. Most certainly this is the vacuum line which includes either appear off, or is broken. You'll find a few places This might come about — nonetheless, hearing it With all the motorists doorway open might be an indicator that it’s coming both from the mainfold, or even the 4WD vacuum change (pictured over, Situated over the firewall).
(I suppose it’s just that time of calendar year when people are trying their 4WD! Hey, I’m happy I may help others fix these troubles, instead of shelling out large bucks to the sellers.
Chris claims: February 12, 2008 at 10:forty eight pm Thanks for the reply Kyle. Because of the time as well as temperature outside in sunny Buffalo NY, I won’t be trying anything at all tonight. I'm attempting to do every little thing at work on lunch where its warm. To clear up a couple of points, I have checked the TCCM. I pulled the duvet off and checked the insides and all appears to be like fantastic. Rusty on the out but no indicator of corrosion inside the TCCM or even the plug. I have visually inspected the EM connector many instances. I have tugged over the wires, and it appears to become in wonderful shape, no corrosion or apparant broken wires. Since the very last write-up, I've exchanged the new EM with A further new one and this one is exhibiting same trouble so I'm 99.99% guaranteed it isn’t the motor. The outdated EM worked when I tapped it Along with the mallet, but only for a short time, mainly extensive more than enough for getting me in 2-Hello. Both equally new EMs haven't worked. What is basically bothering me is The reality that The brand new EM is installed and no blown fuse. Yesterday Once i 1st place it in, the fuse blew within a moment of starting off my truck.
Keep onto that considered for a few days — some software is on the way in which that allows me to retrieve the data files.
As I have stated often times inside the 3 webpages of the article… every thing that I understand about the Chevy 4WD process has long been posted listed here. I don't have any more info to offer. I am NOT a mechanic.
One other spot for 4WD vacuum is underneath the battery — but that is quite a distance in the drivers door, While nearly anything is possible.
One other wire I might Examine could well be the A/T (Automated Transmission) shift lock switch — This is often wire #31 which is mild inexperienced using a black stripe (you can find additional webpages from the schematics over… the 1st can be a hand -published site in the TCCM connector pinout). This wire ought to have voltage applied to it at certain periods — regretably, I have not needed to diagnose that Portion of the program, so I don’t see page know if it ought to be +5VDC or +12VDC (but It's going to be one of these!
As for The inner workings on the transfer scenario, I depart that to The professionals so I'm able to’t reply that dilemma both.
Guest says: December sixteen, 2008 at 6:41 pm nicely i brought my truck in and explained to them they could switch the encoder motor, unsure what was exactly Incorrect with it, they reported it absolutely was enguaging only 50 % way then kicking back again out. nicely not sure what could bring about this, i requested them to inspect all wires to your tccm and see Should the wiring can be the challenge, and so they stated that whenever they fastened my tccm previous calendar year they should have also replaced the encoder motor.
Exact issue as Pablo over. Your weblog served me much I cant thanks enough. Just a little suggestion, I couldn’t discover any terminals within the electronics retailers that would suit this connector, so I rigged some Laptop terminal wires they usually suit just fantastic, no glue required both. You saved me a “bunch of cash” and I didn’t even have to modify to Geico.
I don’t want to provide you with any bad news, however it Seems similar to what I just went by… and it had been the Transfer Situation that required company… badly. My Blazer most likely only has 10-fifteen hours around the 4WD technique, but the “forks” inside the TC had been terribly worn and allowing my gears to float, which made signs and symptoms such as you explain (among Many others).
What you describe sounds like the ported vacuum swap (Notice: this switch is barely on 1999 and up vehicles). I’m not sure about the “Listening to a little something running” — what does it audio like?
The, you'll want to try and set it in 4WD and see if any in the wires alter (they need to reduce their power) — you could have To do that numerous occasions to read the different wires — and an assistant is going to be really helpful! If you’re not receiving the higher than benefits, Verify a similar wires with the TCCM as see if the final results adjust.
Of course, I'm able to’t assure this is your problem, In particular on the internet, And that i hope it isn’t — but I would've it checked out skillfully.