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AW4 Skipping 2nd gear

9

99XJLove

NAXJA Forum User
Location
Grand Junction, CO
My friend has a 95 xj with the AW4 trans in it. Recently he put the 1-2 solenoid in it to fix the not shifting automatically problem he was having. Everything has been fine for like 3 months. Now it is shifting normally with the exeption of missing 2nd gear. It skips 2nd and goes to 3rd and so on. It shifts down fine but skips 2nd there also. Any help would be appriceated.
 
lawsoncl said:
Got another bad solenoid? Doesn't seem likely since both solenoids are on for 1st gear.
Click to expand...
Actaully both solenoids are on for 2nd gear,
1st #1 on, #2 off
2nd #1 on, #2 on
3rd #1 off, #2 on
4th Both off

Are you sure it isn't shifting from 1st into 4th and then TC lock? TC lock feel like a gear because the rpm does drop.
 
R.DesJardin said:
Actaully both solenoids are on for 2nd gear,
1st #1 on, #2 off
2nd #1 on, #2 on
3rd #1 off, #2 on
4th Both off

Are you sure it isn't shifting from 1st into 4th and then TC lock? TC lock feel like a gear because the rpm does drop.
Click to expand...


No it has every gear besides 2nd. Both manually shifting and auto shifting. Goes through the gears normally up and down just no 2nd gear.
 
manual that's normal operation, as I recall - there is 1-2 (only 1, in manual mode) 3 (3) and D (overdrive.) In automatic mode with the TCU powered, not going into 2 would mean... maybe there isn't enough fluid pressure or just plain not enough fluid to run both shift valves at once? That's a complete guess, I'm a transmission knucklehead when talking about anything except the electronics.
 
R.DesJardin said:
Actaully both solenoids are on for 2nd gear,
1st #1 on, #2 off
2nd #1 on, #2 on
3rd #1 off, #2 on
4th Both off

Are you sure it isn't shifting from 1st into 4th and then TC lock? TC lock feel like a gear because the rpm does drop.
Click to expand...

Doh! You're right. Must be that failing memory again.
 
kastein said:
manual that's normal operation, as I recall - there is 1-2 (only 1, in manual mode) 3 (3) and D (overdrive.) In automatic mode with the TCU powered, not going into 2 would mean... maybe there isn't enough fluid pressure or just plain not enough fluid to run both shift valves at once? That's a complete guess, I'm a transmission knucklehead when talking about anything except the electronics.
Click to expand...

On the AW4 it has the 1-2 position. So when you are in the 1-2 range it stayes in 1 untill the RPM gets high enough to shift to 2. There is no way that the fluid level is wrong in the trans either. We run a lube shop and my friend is a very compitent mechanic. He has been doing this kinda stuff for 25 years or longer I would guess. Anyways we'll just test the solenoids again. Not really sure where to go from here.
 
99XJLove said:
On the AW4 it has the 1-2 position. So when you are in the 1-2 range it stayes in 1 untill the RPM gets high enough to shift to 2. There is no way that the fluid level is wrong in the trans either. We run a lube shop and my friend is a very compitent mechanic. He has been doing this kinda stuff for 25 years or longer I would guess. Anyways we'll just test the solenoids again. Not really sure where to go from here.
Click to expand...
This I know. I was saying it only goes into 1 when you pull the fuse to disable the TCU.
 
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