1999: Knob & Dash Light both say 4WD LOw, but it's still in 4-HI, eh wot?

**fixizin** · 05-13-2012, 11:45 PM

1999 5-spd. Ranger as listed under avatar, bone stock.

Recently noticed that vacuum hoses to my PVHubs had disintegrated. I replaced those, which immediately restored my 4-HI function, with appropriate clicks and dash light feedback when engaged.

When switching to 4-LO, I immediately hear the same clicks, see the '4WD LOW' light come on, but... I don't hear/feel the heavy CLUNK that I (dimly) remember coming from T-case, and, sure enough, I'm still ACTUALLY in 4-HI mode.

If the shift motor is not rotating selector shaft all the way to 4-LO position, would dashbd. indicator light still illuminate? I plan to pull and lube that puppy anyway, but don't want to get my hopes up if not the culprit.

I've perused all relevant threads (AFAICT), incl. Sasquatch's bullet-point checklist of conditions that must be met to engage 4-LO, but that leaves me with a few follow-on questions:

> BJB fuse 13 (20A)... what does "BJB" stand for? (No GF/ex-wife jokes, lulz)
> Digital transmission range (TR) sensor... never heard of it, What the Hey?

Not sure how "smart" GEM/control module is as far as what inputs = OK to light up 4-LO dash indicator...??

OTOH, I'm pretty sure it's not due to removing the lame 'Sport' decals from the rear fenders, lol.

**fixizin** · 05-15-2012, 02:12 PM

Additional fault/symptom: system doesn't care if in M5OD is in neutral or in gear, so long as clutch and brake are depressed... bad NSS?

05-13-2012, 11:45 PM	#1
fixizin on DUH Learning Curve Join Date: Apr 2008 Location: Ft. Lauderdale, FL Year: 99 Make: FoMoCo Model: XL 2-dr ext cab "Sport", vinyl flooring, 7.5diff 3L73, PVHubs=S.O.L. Engine: 3.0 (Flex)-->M5OD Class: 4x4 Used For: Sugar Sand Trails Posts: 645 Rep Power: 12 iTrader: (0)	1999: Knob & Dash Light both say 4WD LOw, but it's still in 4-HI, eh wot? 1999 5-spd. Ranger as listed under avatar, bone stock. Recently noticed that vacuum hoses to my PVHubs had disintegrated. I replaced those, which immediately restored my 4-HI function, with appropriate clicks and dash light feedback when engaged. When switching to 4-LO, I immediately hear the same clicks, see the '4WD LOW' light come on, but... I don't hear/feel the heavy CLUNK that I (dimly) remember coming from T-case, and, sure enough, I'm still ACTUALLY in 4-HI mode. If the shift motor is not rotating selector shaft all the way to 4-LO position, would dashbd. indicator light still illuminate? I plan to pull and lube that puppy anyway, but don't want to get my hopes up if not the culprit. I've perused all relevant threads (AFAICT), incl. Sasquatch's bullet-point checklist of conditions that must be met to engage 4-LO, but that leaves me with a few follow-on questions: > BJB fuse 13 (20A)... what does "BJB" stand for? (No GF/ex-wife jokes, lulz) > Digital transmission range (TR) sensor... never heard of it, What the Hey? Not sure how "smart" GEM/control module is as far as what inputs = OK to light up 4-LO dash indicator...?? OTOH, I'm pretty sure it's not due to removing the lame 'Sport' decals from the rear fenders, lol.
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05-15-2012, 02:12 PM	#2
fixizin on DUH Learning Curve Join Date: Apr 2008 Location: Ft. Lauderdale, FL Year: 99 Make: FoMoCo Model: XL 2-dr ext cab "Sport", vinyl flooring, 7.5diff 3L73, PVHubs=S.O.L. Engine: 3.0 (Flex)-->M5OD Class: 4x4 Used For: Sugar Sand Trails Posts: 645 Rep Power: 12 iTrader: (0)	Additional fault/symptom: system doesn't care if in M5OD is in neutral or in gear, so long as clutch and brake are depressed... bad NSS?
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