AW4 slipping
#1
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Location: Norfolk, VA
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Year: 1996
Model: Cherokee
Engine: 4.0L
AW4 slipping
Hey everybody. I was driving to the airport the other day, and my tranny upshifted while on flat ground at 55. You could hear the jeep revving out pretty high, so I slowed down. I dropped down to about 45 mph, and then it shifted into 2nd. I pulled off the highway, shut the jeep down, and checked out what I could see (which wasn't much), but I could see no obvious problems from the outside. it was still upshifting itself into 2nd the whole way, and a few times it would just slip out of gear entirely until I coasted down to about 20 mph. I would think this means my trannies toast, but it only has 123k on it, and hasn't shown one little ounce of tranny trouble before.
Anyone ever have problems like these? What'd you do to troubleshoot?
Anyone ever have problems like these? What'd you do to troubleshoot?
#5
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Year: 1996
Model: Cherokee
Engine: 4.0
1. check fludi levels
2. check voltage on TPS
3. check the TCU see if anything looks bad there.
if all those pass inspection id say yes the AW4 is going/gone.
I just replaced mine last weekend.
2. check voltage on TPS
3. check the TCU see if anything looks bad there.
if all those pass inspection id say yes the AW4 is going/gone.
I just replaced mine last weekend.
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#10
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Year: 1998
Model: Cherokee
Engine: 4.0
Yes definitely start with the fluid, if you don't have enough your trans won't shift. Personally I would probably start with a fluid and filter change if you haven't done that in a while. There is also a fuse for the TCU my brothers Grand Cherokee blew that fuse and the symptoms are similar to yours.
#11
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Year: 1999
Model: Cherokee
Engine: 4.0
1. Ensure fluid is at correct level, red in color and doesn't smell burnt. Checking fluid is ALWAYS job #1. Always.
2. The THROTTLE POSITION SENSOR is directly involved with shifting characteristics and needs to be tested!!!! You will need a manual and a meter (analog best).
3. Follow the FSM for disconnecting the TCU to see if the problem is electrical or mechanical.
If fluid checks out, you really gotta focus on that TPS. I have repaired many an AW4 with shifting problems with a new TPS!
2. The THROTTLE POSITION SENSOR is directly involved with shifting characteristics and needs to be tested!!!! You will need a manual and a meter (analog best).
3. Follow the FSM for disconnecting the TCU to see if the problem is electrical or mechanical.
If fluid checks out, you really gotta focus on that TPS. I have repaired many an AW4 with shifting problems with a new TPS!
#14
the aw4 automatic is controlled by vacuum and the tcm when the tcm is out it doesn’t slip bad at all it just only goes into first and third gear because the computer controls the second gear solenoid, and the fourth gear solenoid, I know this because my fuse that runs the tcm popped and it would drive fine until it tried to shift into second and then it’d jam itself into third
#15
CF Veteran
the aw4 automatic is controlled by vacuum and the tcm when the tcm is out it doesn’t slip bad at all it just only goes into first and third gear because the computer controls the second gear solenoid, and the fourth gear solenoid, I know this because my fuse that runs the tcm popped and it would drive fine until it tried to shift into second and then it’d jam itself into third