Starts in 4th gear!?! -
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post #1 of 4 Old 08-22-2017, 01:20 AM Thread Starter
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Starts in 4th gear!?!

Hi! I could really use some help with my 96 jeep Cherokee sport 2 door automatic transmission. It started a couple weeks ago where I stoped at a red light and when I went to accelerate, my jeep slowly crept up to speed and rpm. My exhaust was howling and my motor was definitely putting out power. I stopped and checked my transmission fluid and everything seemed good there. It stopped for a while but now it's back and happens consistently every time I stop. It seems like I'm always starting in a high gear. I did notice that if I manually put it into 1?2 gear it will accelerate just fine. Before I go and drop a grand on a new transmission I would like to see if someone can help me. S.O.S

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post #2 of 4 Old 08-22-2017, 01:41 AM
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It most likely doesn't start in OD, it starts in 3rd gear. AW4 transmissions are extremely reliable mechanically, including shift solenoids, problems with these are often related to it's control circuit or wiring.

AW4 is electronically- controlled, hydraulically operated transmission. If the TCU (transmission control unit) looses power feed, or if it breaks, transmission will default to 3rd gear if you're in D. It should give you 1st gear with the shifter in 1-2; 2nd gear is always electrcially controlled on these, so you won't get 2nd gear without electric feed into the tranny. 3rd will be applied with the tranny in 3rd or D.
IIRC it should also shift to OD even without power but it's been a bit too long I tried that I honestly don't remember.

THere are a number of things that can cause power loss, bt I'd start with checking the 10amp fuse for the +12V power feed for the TCU. ANother option is a disconnected/ broken TCU connector (very rare that I know of), broken TCU, broken connector at the tranny, or a wire harness issue.
People have had occasionaly problems with the shift solenoids as well, but those issues are fairly rare. Most often it's the power feed to the TCU or TCU issue.

It's also worth checking the TPS, but TPS usually doesn't cause a complete no-shift scenario - usually a bad TPS causes weird shift points or lack of downshifts/ upshifts on certain gears or throttle positions.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

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post #3 of 4 Old 08-22-2017, 01:44 AM Thread Starter
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Ok I will check first thing tomorrow and report back if the fuze is bad or not. Thanks man, hopefully this fixes it!!!!
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post #4 of 4 Old 08-22-2017, 09:51 AM Thread Starter
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So I checked and I was unable to locate the fuze. I found the tcu itself but the wires are wrapped in black tape and I loose them into the fire wall. Is the fuze under the hood somewhere?
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