Transmission problems

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BOSS.HOSS.XJ

NAXJA Forum User

Location

South Carolina

• Apr 28, 2021

• #1

Transmission in 96 xj seems to be stuck in 3rd. Won't down shift. I can change gears manually but it won't shift into overdrive. I've been told it could be a ground problem but have no idea where to start or which ground it could be.

 

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Rob Mayercik

NAXJA Member #920

NAXJA Member

Location

NJ, U.S.A.

• Apr 28, 2021

• #2

TCU fuse could be. Not sure if it's in the under-dash fuse panel (in which case, see owner's manual) or the underhood PDC (see markings inside its lid), but worth a check.

For grBest thing to help chase grounds would be a wiring schematic - got an FSM or haynes manual?

 

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BOSS.HOSS.XJ

NAXJA Forum User

Location

South Carolina

• Apr 28, 2021

• #3

I've checked all fuses. No bad ones. Put tcm in another xj, didnt have any problems out of it. Dont have a manual but will have to get one to get started with the ground connections. Thanks.

 

Tim_MN

Freakish Hand Strength

NAXJA Member

Location

Minneapolis, MN

• Apr 28, 2021

• #4

If you do some searching, you can locate the AW-4 Service and Diagnostics Manual, and download a copy.

Haynes and Chiltons are OK for oil changes and brake jobs, but pretty useless for much more than that. A genuine Jeep Dealership Service Manual is about $15 at www.pacificcoastmanuals.com.

 

techno1154

NAXJA Member

NAXJA Member

Location

In the islands

• Apr 28, 2021

• #5

Rob Mayercik said:

TCU fuse could be. Not sure if it's in the under-dash fuse panel (in which case, see owner's manual) or the underhood PDC (see markings inside its lid), but worth a check.

For grBest thing to help chase grounds would be a wiring schematic - got an FSM or haynes manual?

Click to expand...

In my XJ, it is in the engine compartment PDM, one of the micro fuses,...I think 15 AMPS.

When the #1 sift solenoid went bad, the AW4 would not start out in 1st gear and would not go into overdrive.

 

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cruiser54

NAXJA Forum User

Location

Prescott, Az

• Apr 30, 2021

• #6

try this first.

http://cruiser54.com/?p=58

 

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lawsoncl

NAXJA Forum User

Location

North Idaho

• May 1, 2021

• #7

I suspect either no power to the trans computer, or a bad #1 solenoid. Start by testing that the trans computer has power, and the solenoid resistance. https://www.cherokeeforum.com/f2/p0740-trans-code-tests-results-197883/#post2921296 has a diagram and info about measuring from the trans computer connector.