Josh claims: December 21, 2007 at 5:fourteen pm Im submitting this because just lately i have worked on two s10 blazers Along with the same problem and everyone held telling me to check vacuum and and the acuator. Initial off each of these the 4wd light would mild like it absolutely was Doing the job though the front axle was not engaging i checked the acuator and it absolutely was Operating so i jacked the vehicle up and attempted to manualy have interaction the axle without any luck. So i made a decision to pull the axle tube off the passenger facet and check the locking hub.
The grey with black stripe wire (GRY/BLK) at pin 5 is definitely the 4Hi signal wire — when pressing the 4Hi button, this wire ought to go very hot (I haven’t exam the wire, so I’m not sure if it’s utilizing logic concentrations (+5VDC) or battery electricity (+12VDC) — In any event, it ought to be incredibly hot in the event the button is pressed.
The TCCM is Doing work, the encoder motor is Performing, the front, suitable axle is participating, and your vacuum lines are Performing (there are far more, but these are generally the significant types). The trick in this article are going to be to determine what is 4Hi dependent, and why it won’t kick into 4Hi.
). I've a definite “vacuum†sounds coming from under the sprint, near the heater core. At lower speeds it “whistles†(similar to a leaking vacuum would seem like), and goes away at greater speeds.
I don’t want to give you any terrible information, however it sounds similar to what I just went by… and it had been the Transfer Circumstance that wanted support… poorly. My Blazer possibly only has ten-fifteen hours within the 4WD process, nonetheless the “forks†inside the TC were being badly worn and permitting my gears to float, which developed signs such as you describe (amid Other folks).
So I parked it and pushed on the buttons and all of a sudden the services 4 wheel push mild arrived on, so I bought annoyed and left it like that and today I was checking The web and I discovered your website and like I claimed t the begining I attempted a handful of issues plus the servivce light came off but I however haven't any lights over the switches. So I am stumped if you have any ideas I might drastically value the feed again trigger This is often driving me NUTS
goes into store this week..just wondering if it is a linkage of some form? possibly u joint? The lights displays the adjust into 4Hi is complete and 4 automobile also..but just no traction from front wheels..maybe a transfer case concern?
It’s seriously not easy to explain to without being able to set my hands on it. Nonetheless, You may additionally want to check the encoder motor signal lines (C26 by C28 on the pinout from the first article) — they must be superior (+5VDC) when the are not in use (resistors pull the strains substantial), and small when they're Energetic (referred to as “Lively minimalâ€). All schematics are posted in the 1st post of the thread.
I may very well be Improper with this, but simple logics (as well as schematics) tells me to start out looking at the wire that forestalls the TC from shifting When the A/T is in equipment.
Once more many many thanks on your information and facts. My 4wd is Doing the job now as a result of you.$60 for areas and 1 hour to reinstall. Ron bobbitt in West Virginia
Fixed that and however no 2hi. When I try and improve from 4hi to 2hi I am able to listen to the encoder motor & vacuum solenoid within the firewall do their task and also the Regulate module clicking so I presume it’s carrying out it’s work. I have two lights on dash causing get worried, ‘Company 4wd’ & ‘ABS’. Would the abs process fault stop it from heading into 2hi? I understand your not a mechanic but Have you ever any data for me?
That’s some pretty good information to acquire. Be sure to do let me know the way you make out with the encoder motor alternative.
The TCCM clicks and we can easily hear a motor functioning if we drive the 2 substantial button however the two large light-weight flashes and after that goes off. I'm able to’t get in to the mechanic for numerous days. My spouse And that i would like to know If we unplug the wire harnesses from the TCCM and leave them unplugged till I might get into the mechanic, will that hurt anything at all? Many thanks for the assistance
You spot these strings parallel to the sides of your vehicle pulled taught and utilizing a tiny plumb bob as well as a ruler or gauge board, measure the space through the thrust line string where it exits the back again of the vehicle to 1 facet outer string using the plumb bob. Remember that distance and shift the ruler to your front, and do the exact same point, changing the front jack stand to try to get the gap exactly the same. Repeat until you will be happy which the two strings are parallel. Then repeat for the opposite aspect of the car. You wish your outdoors strings to become about 9 inches absent out of your wheel facilities to help you flip your front wheels without hitting the strings. Proven under go to website is actually a pair of images displaying the usage of a plumb-bob (and dial indicator holder) to insure the strings are parallel (click on for more substantial pictures).