Everything you ever wanted to know about the AW4

[esweezey]

Thanks, kastein and HappyDog, for your feedback. Got it, kastein: I won't check resistance on a hot circuit, and the person doing the testing will not also be doing the driving. And, Happy Dog, I do think it would be helpful to know whether I'm losing power somewhere between TCM and the TCC solenoid. Two quick questions:

1. Do you know current draw of (amperage supplied to) the TCC solenoid by the TCM?

2. Do you have, or know where I can find, the list of the (diagnostic trouble) codes that can be stored in the TCM's memory?

Thanks again.

 

[HappyDog]

Thanks, kastein and HappyDog, for your feedback. Got it, kastein: I won't check resistance on a hot circuit, and the person doing the testing will not also be doing the driving. And, Happy Dog, I do think it would be helpful to know whether I'm losing power somewhere between TCM and the TCC solenoid. Two quick questions:

1. Do you know current draw of (amperage supplied to) the TCC solenoid by the TCM?

About an amp. The resistance is supposed to be about 15 ohms, and the voltage will be about 13v across the solenoid.

2. Do you have, or know where I can find, the list of the (diagnostic trouble) codes that can be stored in the TCM's memory?

Look here: http://www.trnw.net/z-search/AW4.php

 

[XJjamez]

Who hoo who hoo it worked it worked. Tranny shifts great. Recon I can get out of the tranny thread. Got a couple of other issues, temp gauge not working and electric fan the same, Both probably related but tranny is good. Gona to air my problems elsewhere in the fourm, but thanks a bunch to "every thing you ever wanted to know about the AW4. Got it going. Adios pals.party1:

 

[HappyDog]

Look here: http://www.trnw.net/z-search/AW4.php

Now that I've looked at the list more closely I think it is generic instead of being directly from Chrysler-Jeep. One reason I say that is it shows several trouble codes related to transmission temperature, but as far as I know the AW4 that is used on our Cherokees has no transmission temperature sensor. So maybe we should consider this list of trouble codes as possibly useful but maybe not definitive.

 

[child9]

Yeah, the a340e and other variants that are found in Supras and a myriad of other Japanese vehicles have a fluid temp sensor and a few more electronics.

 

[BigKintheXJ]

Hello!
I just picked up a lovely 2000 xj, with a transmission that wont go into gear, and makes this terrible whizzing grinding noise. Lucky me I have a transmission from a 97 in my front yard! I read the little speal about how a 97 tcu will work as long as the extra speed sensor is left disconnected. I already picked up a 97 TCU, and am hoping to be able to get the transmission out of the jeep today so I can compare the two. I'll keep everybody updated on how it goes. I know there is very little information on this type of swap so I'll try and document as much as possible, as well as point out the differences so everything is clear.

Thanks!

Also, both are 2wd transmissions! if anyone wants to know any technical info that doesn't require opening it up, let me know!

Success! no codes! shifts and speedo are great! I'll be making a thread on CherokeeForum later tonight, I'll try and include as many pictures as I can, however I did not take any during the swap. I'll post a link on here once I am through! I don't check this forum as often as cf, but I will from time to time to answer any questions that come up. Otherwise you can reach me on CF under my username: JerrytheJeep.
Cheers!

 

[XJjamez]

Back to pull the tranny again. Still shifts great, if you can keep the fluid in. Question for this evening; what came first, the burnt front seal or the low fluid? I know the chickin or the egg right. On the maiden voyage to haul wifie to work- about 40 mi.- I knew I had a slight leek on return line, thought it would be fine... bad idea. Forgot that women drive it till it stops, not till it needs to be checked. BIG difference between the two. And with extra fluid in the hatch even. Anyway so now I have a burnt front seal...yay. So should I just drop it and replace the seal, or beg for the correct year aw4? This sucker was awesome for the four days or so that I got to be sportin the 4wd il6 4.0 with danas 30 &35 Possi in the back, striking off elevens in my pepes drives. AW...yea. Loven the XJ...

 

[child9]

Swap the seal! Fix leak.

 

[XJjamez]

10-4 nine

 

[kastein]

New tidbit of information... was working on my uncle's 2000 4.7L automatic Toyota Tundra this last weekend. Looked up and said to myself, that tranny oil pan outline looks really familiar... and it says D2 on the drain plug (Dexron II.) Hmmm... didn't Toyota use the A340/AW4 in some things?

Checked the passenger side and it's definitely an AW4/A340 derivative, it even had a nameplate that said 30-40LE.

So anyone who wants to put a 4.7L Toyota V8 making 245hp/315ftlbs (and there's a VVT version with 282hp/325ftlbs, and does anyone know if a 5.7L supercharged V8 will fit the same bellhousing as the 4.7?) in front of an AW4, or a Toyota transfer case behind one, there is almost certainly enough parts crossover to build some sort of crazy red headed stepchild of a transmission. Have at it.

The oil pan looks quite a bit deeper, I know there was some discussion about 6 months ago of having custom deep aluminum AW4 pans made, or cutting up two steel ones and welding them together to increase fluid capacity, well, if someone wants to try bolting a Tundra one on, I bet it'll fit. Make sure you find a way to retain the two formed steel hardlines from the valve body to the trans housing.

 

[dieselenthusiast]

The oil pan looks quite a bit deeper, I know there was some discussion about 6 months ago of having custom deep aluminum AW4 pans made, or cutting up two steel ones and welding them together to increase fluid capacity, well, if someone wants to try bolting a Tundra one on, I bet it'll fit. Make sure you find a way to retain the two formed steel hardlines from the valve body to the trans housing.

That would be very interesting if it bolted right up, especially after all the conversations about people wanting a deeper pan. I, for one, would be very interested.

 

[O-Gauge Steamer]

Just for the record here is the A340/AW4 Usage List:

1987-1992 Cressida (30-40LE)
1986-1998 Toyota Supra non-turbo
1987-1998 Toyota Supra turbo
1990-2000 Toyota Chaser/Mark II/Cresta 2.5 (1JZ-GE)
1995-2004 Toyota Tacoma 2.7L I4 (4WD), 3.0L V6, 3.4L V6
1993-1995 T100 3.0L V6
1993-1997 Previa 2.4L w/supercharger
1991-1997 Aristo 3.0L I6 Turbo
1992-2000 Lexus SC 300 3.0L I6
1992-1999 Lexus SC 400 4.0L V8
1990-1995 Crown Majesta 3.0L I6
1999-2003 Crown Athlete V (1JZ-GTE)
1994-2000 Toyota Soarer 3.0L I6 (2JZ-GE)
1995-1997 Lexus LS 400 4.0L V8
1989-2002 4Runner (4x2) (30-40LE)
2001-2004 Sequoia (4x2)
2000-2004 Tundra (4x2)
2005-2007 TOYOTA COMMUTER 2.5L DIESEL
1985-1995 Toyota Pick-Up 3.0L
1991-2001 Jeep Cherokee 4.0

A popular box for sure...

 

[CobraMarty]

Wow, I4, I6, v6, v8, N/A, S/C, Turbo, gas, Diesel, what's missing? rotary? LOL.

 

[kastein]

Both Toyota (22R/22RE) and Jeep (2.5) put the AW4 behind a 4cyl at some point. Jeep only did it from 87-90 though.

 

[child9]

Just for the record here is the A340/AW4 Usage List:

1987-1992 Cressida (30-40LE)
1986-1998 Toyota Supra non-turbo
1987-1998 Toyota Supra turbo
1990-2000 Toyota Chaser/Mark II/Cresta 2.5 (1JZ-GE)
1995-2004 Toyota Tacoma 2.7L I4 (4WD), 3.0L V6, 3.4L V6
1993-1995 T100 3.0L V6
1993-1997 Previa 2.4L w/supercharger
1991-1997 Aristo 3.0L I6 Turbo
1992-2000 Lexus SC 300 3.0L I6
1992-1999 Lexus SC 400 4.0L V8
1990-1995 Crown Majesta 3.0L I6
1999-2003 Crown Athlete V (1JZ-GTE)
1994-2000 Toyota Soarer 3.0L I6 (2JZ-GE)
1995-1997 Lexus LS 400 4.0L V8
1989-2002 4Runner (4x2) (30-40LE)
2001-2004 Sequoia (4x2)
2000-2004 Tundra (4x2)
2005-2007 TOYOTA COMMUTER 2.5L DIESEL
1985-1995 Toyota Pick-Up 3.0L
1991-2001 Jeep Cherokee 4.0

A popular box for sure...

If anything they are close enought to be made to work well. I chose the bolded combo. My Supra trans was modified by switching the rear planetary gear set, clutch pack, output shaft and tail housing from my AW4 and the Toyo tranny plugs directly into the Jeep transfer case. In fact, I'm sure I've posted that list before...

 

[XJjamez]

Alright seal in and holding tight. Fixed lines, no leaky leaky. All is well, for the most part. Sometimes it holds a little long in first gear. Only sometimes though. Thoughts anyone?

 

[my2monkeys]

Best Transmission Ever:

Trans. cooler line came loose and pumped out all my fluid on the freeway in 100*f 60mph traffic!!

Thought I had just used all the life out of the aw4 with the 441,000 miles she had on her.

But when I got to the side of the freeway and the nice Freeway Service Patrol told me

" I was leaking alot of fluid up front" (I wasn't getting out to check and get run over by a Mercedes going 80 mph!)

I was happy to see that just my rubber cooler line had come loose.

So after 4qts of fluid and a hose clamp torque down, she's ready for another 400,000mi. of faithful service!

 

[Racer~X]

1989 Cherokee ltd. 4L, AW4, NP242, 3.55, 'RENIX'
how difficult is it to replace the torque converter lockup (clutch?) and / or solenoid ??
How can you test to see which is the problem ?
actually I assume that if is slips at all - for years - the clutch or 'lock-up' surface needs replaced.?.

How viable is a later model junkyard one?
how much modification for JY parts?
AnyOne?

 

[ParadiseXJ]

Kastein,
I have just finished reading the entire thread. I bounced off my issue several times but never really nailed it down. 88MJ 4.0 - swapped an AW4 in to replace the blown BA-10.

I thought I had it dialed in but I can't figure if it's NOT locking up the TQ or IS and just staying locked. What I'm looking for is the location of resistor for the TQ / brake wire. Lt blue/yellow wire The wire is there on the TCU and under the dash. Hope I'm explaining this correctly.

...AND I'm using the regular Renix brake switch, but since I don't have cruise, it's just the 2 pole switch. Do I go with the 4 pole switch or is there a way to use the 2 pole switch...OR do I use the HO switch that came with the donor, a 94.

 

[Ecomike]

Kastein,
I have just finished reading the entire thread. I bounced off my issue several times but never really nailed it down. 88MJ 4.0 - swapped an AW4 in to replace the blown BA-10.

I thought I had it dialed in but I can't figure if it's NOT locking up the TQ or IS and just staying locked. What I'm looking for is the location of resistor for the TQ / brake wire. Lt blue/yellow wire The wire is there on the TCU and under the dash. Hope I'm explaining this correctly.

...AND I'm using the regular Renix brake switch, but since I don't have cruise, it's just the 2 pole switch. Do I go with the 4 pole switch or is there a way to use the 2 pole switch...OR do I use the HO switch that came with the donor, a 94.

I think you need the 4 pole brake switch, 2 wires from it go to the TCU IIRC. There is a resistor or diode in the wire harness near the TCU on my 87 IIRC.

I added a red LED to mine to show power to the TCU lock up