dodahman

For starters I have have a 1989 Ex-cab auto the 3.slow which died in my yard in the summer of '09 doing yard work. Head gasket and I was glad I was home. Started the project in August of '10, he donor is a JDM 5vz supposedly with low miles. Compression was strong. The year was unknown but I had to drill the the oil plug, I speculate 2000ish. However, the plug wires had 1997 stamped on them, Hmm... I have 1995 4wd auto T100 ECM and a 1997 2wd T100 harness which I converted to 4wd. I fabbed my crossover, swapped all the usual stuff for the swap. The stickies are great and excellent source of information there! I have done a lot of research and this forum has been a great help. I am getting close to buttoning everything up, and yes I am on the wiring phase. Biggest challenge thus far is the C2,N2, Ih2, Ik2 connector. Not sure which one it is called on the '89 but I have the 16 pin version which I cannot find on any wiring diagram on the internet. I would welcome some insight here if anyone has the smoking gun, but I am prepareed to figure it out the old fashion way. However, as I have read, some have had success with the a340h using T100 ecm. Does anyone have insight on where the S4 wire from transfer solenoid would be pinned? I noticed the 5vz has TFN at pin 17 on the E4 connector. Is this the same?

aferg

Sorry, what I have for the 89 V6 does not tell me where S4 is pinned to... ? But it does tell me that the wire color is G-R (Green with Red)

Hope it helps some...

Andrew

dodahman

Andrew, I truly appreciate your effort and thank you for your response. I must clarify further, as I guess I wasn't very clear with my 1st post. I have the wiring diagrams for 1990, 1992 3vz Pickup and 1995 5vz T100. The S4 pins into the ECM and the #4 solenoid on the a340h which controls the transfer. My question is where would the S4 connect to the 5vz ECM. According to several posts the a340h will work with the 5vz. I believe the thefatkid, thefallman, ukrunner have had working examples of this combination and probably others. I was speculating that the TFN connection with facilitate the control of the #4 solenoid but I could be wrong. So you guys that have done this, what is it? Do I need to wire a separate switch for manual operation?

aferg

Sorry, i looked through the EWD's I have for the 95,96,97 T100, but could not find the 4th solenoid? strange.... I'm not using a transfercase so I guess i missed that... Sorry I can't help...

Andrew.

dodahman

Thanks, that's what I got too. A least I know I am not crazy, ha! What I have read is the #4 solenoid is exclusive to the a340h transfer unit. It is in the 0 volts normally closed condition until shifted into L4 and vehicle is under 19 mph. In the H2 position the Forward Clutch, C3 connects transmission output shaft and transfer pinion gear. In H4 position both C3 and the Direct Clutch, C4 connects transfer rear output shaft and front drive gear. And in the L4 position O/D Direct Clutch, B4 prevents transfer ring gear from turning either clockwise or counterclockwise. In this condition C3 drops out (0 volts) and 12 volts open up the #4 solenoid. Know the 3VZ ECM measures all the parameters to activate this. The 5VZ does not appear to. My thought is to wire the #4 solenoid to a switch with a relay somewhere in the cab and control this manually. When switched on, relay would would send 12 volts to the B4 and C4 and 0 volts to C3. So, guys who have ran the a340h behind the 5VZ, did you encounter this? I can't be the only one.

dodahman

Anyone???

Quick Draw

That diagram looks kind of terrible. Go to the link below, sign up for an account, and buy a 2-day pass to download some better diagrams. That's what most people do here. Grab as many documents as you can...anything you might possibly use. When I downloaded stuff for my engine swap, I found that most of the strange pins with some obscure name were fairly clearly explained and included resistance ranges and just about everything you could need to know to hook it up and make sure it works. Also the diagrams are color coded, fairly large, and easy to follow. It's well worth the money, IMO.

https://techinfo.toyota.com/techInfoPortal/

dodahman

Yes, you are right. I did that and well worth the money. However, they don't have the 1989 model year, too old I guess. I was able to down load 1990 Pick up and 1995 T-100. Also, I have 1992 Pick-up and 1997 T-100. So diagrams are not the problem. I realize most people would say source a A340F and be done with it. But, hey I am cheap and I have $1600 in the rebuild and the goal is to keep it under $2000. Lastly, according to some members it has been done and works. So someone has encountered this small issue. I don't think running the A340H is a deal breaker, it will work and apparently has. I just want to have he 4low to work. As I have mentioned before, I believe a normally open relay (0 volts) connected to the #4 solenoid that when closed (12 volts applied) would would engage the solenoid providing lock up. It also looks like it would need to be some sort of 5 way type relay so you could open the C3 transfer drive clutch. I am not an electrical engineer but this sounds reasonable.