The vacuum switch shouldn’t make much sound, not sufficient being perplexed with some thing running. What I suspect is you happen to be hearing the encoder motor over the transfer case wanting to change it into 4wd.
It Appears “electrical†to me… accordingly, the primary spot I’d start out seeking is at the TCCM for corrosion. Then, I’d Have a look at the schematics posted within this thread and begin in search of sensors.
The grey with black stripe wire (GRY/BLK) at pin 5 is the 4Hi signal wire — when pressing the 4Hi button, this wire should really go incredibly hot (I haven’t take a look at the wire, so I’m not sure if it’s employing logic concentrations (+5VDC) or battery electricity (+12VDC) — In any case, it ought to be warm once the button is pressed.
PS – the flashing change lights reveal the process is attempting to talk to the remainder of the system. When it stops, it means it couldn't talk to A part of the program.
John Boy states: December 4, 2008 at 7:19 pm You are a hero to many people! Investigating your website it seems you've saved folks hundreds Otherwise A huge number of pounds by aiding folks repair their 4WD issues them selves. I solved my dilemma following looking at about vacuum leaks. Certain sufficient the vacuum hose experienced broken from the turn on firewall. It appears the hose was far too shorter to start with and was kinked leading to it to are unsuccessful prematurely.
With any luck ,, this could established you off in the right course. Please allow me to know what you discover as it may be of use to some other person below Later on.
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Believed I would give you an update on my 4wd condition. As I indicated in my first publish, I had a vaccum line free. I thought it went to the canister in the fender, what’s additional, I believed it experienced one thing to carry out with my 4wd not Doing work. Properly, which was the situation. I discovered the attachment for that line around the canister. I acquired a new vaccum line (the a single I had was weathered), put in it and hooked it up on the canister. Then I went to a muddy spot inside a sub-division beside mine, drove in the mud in 2wd. I just sat the spinning the rear wheels. Then I pushed the 4HI button, the light flashed for just a next, then came on good.
I, myself, don’t know of wheel alignment near 19090 any vacuum Positioned at the transfer circumstance, but I'll consider to find out for you (I've a transmission shop inside the household — I just named, even so the knowledgable a single is not however in). The TC is very close to the front of the auto — will you be confident the vacuum will not be coming in the firewall space?
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I basically sat all the way down to do some work on the website yesterday, in addition to updating my backup drive — that’s when the issues started off. In any case, before I change this put up into a rant… I hold the schematics sitting down appropriate in front of me, wanting to be scanned as soon as I am able to get this device restored.
Have a look at the schematic “front axel switch & pcm.jpg†— after which you can have A different look at the wires within the TCCM (Transfer Circumstance Command Module), Positioned underneath the travellers kick panel.
Without understanding what is happening along with your controls, I don’t know what extra I can offer you. When your controls do the job, and also you right here the Transfer Circumstance Regulate Module (TCCM – the module underneath the travellers kick panel!