It’s not easy to say what your difficulty is. I’d get started with checking out the encoder motor — If you're able to listen to it run briefly, then what I'd personally do is just take it from the transfer situation and check out to interact 4WD then — enjoy the motor and see what it does — try it in all modes (2Hi, 4Hi, 4Lo) and look at the motor. If that is apparently Alright, the next issue I'd personally do would be to try to manually change the TC Together with the “tab†that should now be protruding from the facet of the TC (beneath the encoder motor that you choose to eliminated) — it is this tab the encoder motor turns to have interaction the several modes.
It’s attainable the technique is participating by itself. Nevertheless, 4WD engages WITH vacuum, not devoid of — appropriately, maybe you have a nasty vacuum change and that is making it possible for vacuum through when it shouldn’t. Now, why the lights are going out, that is certainly odd. I wouldn’t Imagine the process would “point out†4WD when it wasn’t physically set there — meaning, In the event the 4WD technique DID come about to kick in on account of vacuum, the TCCM would have not obtained a sign To place the system into 4WD and therefor wouldn't transfer the encoder motor, or activate the 4WD indicator lights. If your 4WD technique is kicking in because of vacuum, the only real detail to generally be influenced could well be the front axle, that is what is managed through vacuum.
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The opposite wire I'd Examine could be the A/T (Computerized Transmission) shift lock swap — This can be wire #31 and is particularly light environmentally friendly that has a black stripe (you will find more web pages on the schematics higher than… the initial is actually a hand -created page on the TCCM connector pinout). This wire should have voltage applied to it at selected moments — regretably, I have never had to diagnose that A part of the procedure, so I don’t know if it should be +5VDC or +12VDC (but It's going to be one of them!
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Something which you could Verify immediately is to lay down beside the vehicle and have someone Gradually push ahead (whilst in 4WD)… you’re looking to see Should the driveshaft with the TC for the front diff is actually turning. If it is, the trouble is ahead of that (ie. front diff), Otherwise, the condition Pop Over To This Website is from the TC.
That’s good news! And if you’re obtaining free of charge flowing vacuum, then you are aware of what the challenge is… you simply have to uncover it! Great luck with that, And that i hope you've got a heat garage to get it done in! Let me know.
So, you’re declaring the lights Don't flash when attempting to interact 4Hi? That’s just a little unique, with a pair far more smaller points to examine because the lights must flash Should the TCCM is receiving the sign.
Should you be referring on the TCCM (Transfer Circumstance Manage Module) — Certainly, it need to click on with Just about every modify due to mechanical relays employed throughout the module to perform the particular switching.
Regretably, I have not experienced experience together with your distinct dilemma — but it surely does seem like it may well possibly be described as a) exactly the same trouble as I used to be owning (ie. internal gears / forks with the transfer scenario not letting entire shifting from a single manner to the opposite), or b) a front axle change difficulty (which is found inside the Electrical power Handle Module (PCM) — but that’s about all I will help you Together with the PCM as I don’t even know where it’s Situated).
In the event you listen to the press in the TCCM, that tells you the relays are Doing work and are trying To place the encoder motor in equipment. There are various explanations for this to happen, damaged/leaking vacuum strains to begin. The encoder motor wires might be bad. You will find a “plastic bushing†that keeps a “fork†within the transfer scenario in the place (well, the fork keeps the gears in the right place)… Should the plastic bushing is worn, it can cause the transfer situation not to switch (this occurred to me, though the signs and symptoms ended up that the method would swap to 4Hi/4Lo, with a major clunk, and it absolutely was very hard to get it back again away from 4WD.)
Hopefully, this can set you off in the right route. Remember to allow me to know what you discover as it could be of use to another person in this article Sooner or later.
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It does seem like points are undertaking their job — I really don’t like stating such things as this as I'm not a mechanic, so I could be Incorrect (with any luck ,), but it really appears like a transfer scenario challenge to me.