AW4 shifting early!

[mtbxj87]

check every and all fuses in the block and replace if necessary. even if a dome light fuse ect.. Im looking at a diagram it looks like fuse#10,11,16,25 are within the trans wiring circuit

 

[mtbxj87]

Check the NSS or range sensor on the passenger side of the transmission.

 

[mtbxj87]

I had a problem with my aw4 a while back, if i knew what i know now about it i would have been done alot sooner, so im trying to help you. I would check the wiring at the TPS for ground and input voltage and output voltage. If you have a diagram it will make it easier.
At the TPS with the ignition ON not RUNNING:
Brown/yellow is your ground
Orange is your 5volt reference (should have close to 5volts)
Orange/dark blue is your TPS signal for the TCU and PCM (this changes with throttle movement)

 

[yamahjeep105]

Okay once I'm off work I will check and clean the nss and check all fuses and I'll also check the tips voltage thanks guys

 

[cal]

Make sure you check the voltage using the ground on the sensor, and not ground on the chassis/engine.

 

[yamahjeep105]

Will do! I hope I can get it fixed before this weekend, the Mrs's and I have dirt bikes to go ride

 

[yamahjeep105]

Checked all fuses not one was popped, checked voltage to the tps and get 5.2 volts now I'm going to check the nss..

 

[cal]

What's output voltage? Does it sweep smoothly with throttle?

 

[yamahjeep105]

I'll have to check it again

 

[yamahjeep105]

The nss wasn't bad but I cleaned it and its going back in now

 

[yamahjeep105]

Just tested the tps signal for the TCU and it was smooth from 0.8 to 3.something. But it was absolutely smooth.. I'm running out of options guys
:\

 

[ehall]

Does it work properly when shifting manually? TCU bypass

 

[yamahjeep105]

Well it holds first gear for ever idk if it'll shift to second lol and if I put it in 3 it still does it 1-3. Then if I put it in D then it'll drop waaay down in rpms

 

[Johnnie Walker]

Basically, what he is asking is.. if you disco the TCU and shift manually when you drive, is it the same or better?You will not have 2nd gear with TCU disco. but lockup should still work.
If you have not done this, disco. the TCU and drive it as such. You will have to manually shit it.

 

[yamahjeep105]

Well update I took it out the hwy and floored it through all the gears from about 10mph to 75mph and set cruise at 70. Came into town to the stop light and it didn't act like it was going to die coming to a stop.. And it doesn't seem to shift so early.. Ill cruise at 30mph at about 1100-1200 rpm. Can any one tell me if that's right?

 

[mtbxj87]

If I drive under 45mph I'll keep it in 3rd. Like in town driving. Cause mine will up shift in to 4th around 40-45 and its too high of a gear, so I i have to accelerate at all it has to drop to 3rd.

 

[mtbxj87]

So no what you described doesn't sound that bad. Unless mine is off also but I don't believe it is. I've had to do that with all my cars. It's like if you have a 5spd manual, you're not going to drive around @30mph in 5th gear.
That said, are you still getting codes?

 

[yamahjeep105]

Yea it seems to be better than it was might even be normal now but yes still getting p0700 and p0740 I don't know why

 

[yamahjeep105]

Well scratch that its back at it again :/ once it cooled down over night its doing the exact same thing I'm headed about an hour out of town today I'll see if it acts up or changes. This is frustrating!!

 

[ILLJUSTFABIT]

I didn't see it mentioned.
Did you try adjusting the TC cable yet?