Thoughts on TOD disconnect

[vovkus]

There are 3 possible modes for VX:

1. Regular TOD mode.
2. TOD Off, Clutch Solenoid ON (50/50 HI)
3. TOD Off, Clutch Solenoid OFF (2WD HI).

To prevent Check TOD error, the TOD control unit must be connected to the dummy load.
Provided diagram shows how to do this.

You need two switches. One for TOD ON-OFF, and second to
switch between 50/50 HI or 2WD HI.


Relay 1 used for locking Clutch ON-OFF Switch in TOD ON mode.
Relay 2 used to connect Clutch Solenoid (In TOD ON mode) or Dummy load (in TOD OFF mode) to the TOD Control Unit.

[Michael S.]

vovkus,

Thank you!

The scheme looks like the right one...

I have a questions and one addition though:

1. I see a 30A fuse here -- isn't this little too much? If I recall it correctly the Trooper guys are putting 10A for their 50/50 mod.

2. The wire to use is an LB wire coming out from the connector C-44 pin No 4. ( I was wrong wen said that it is a Y(ellow) wire! ).




The above screenshots are taken from the Isuzu VehiCROSS 2001 Repair Manual.

[Nazrat]

I'd love to see the same screenshots or paper pages describing the Trooper TOD computer. This is entirely speculation, but the Trooper could use the 4-hi switch as the "TOD on" signal. I wouldn't try it until someone comes up with the Trooper diagram however.

-Tad

[BigSwede]

This is all great information, but isn't the front drivetrain still going to be turning all the time, negating and mpg improvement?

That is, unless you install manual hubs...

Hey, why does it say I only have 1 post? I have a few more than that here FWIW.

[Michael S.]

Originally posted by Nazrat
I'd love to see the same screenshots or paper pages describing the Trooper TOD computer.
...
-Tad

Here you go:

THIS IS IMAGES FROM ISUZU WOKSHOP MANUAL FOR TROOPER !TROOPER! 2001



This is the solenoid control circuit.





The 4WD Auto switch connection.






And this is something that VX doesnt have -- VSV (Vaccum S??? Valve) ...


Sorry for lack of details and lousy pics -- have to work, you know

--
Michael

[Nazrat]

Looks like pin 30 in connector B-48 is the TOD switch input to the TOD computer. According to the CD that I'm looking at about the VX the pins and connectors are entirely different. So much for the "Easy Way"

-Tad

[Nazrat]

Originally posted by Michael S.
Here you go:

And this is something that VX doesnt have -- VSV (Vaccum S??? Valve) ...


Sorry for lack of details and lousy pics -- have to work, you know

--
Michael

VSV = Vacuum Switching Valve - this is what engages the axle-disconnect in the front axle.

-Tad

[Spy Hunter]

Sweet moses! You can do all that fun stuff if you want 4HI, but if you just want 2WD, cut the light blue wire going into the box under the passenger seat and install a 3-pole switch with an LED or light, bingo 2WD

[vovkus]

I made a mistake on the
Diagram

1. Use 10 AMP fuse instead of 30 AMP.
2. The "hot" wires (+12V) of all switches need to be connected to the +12 V source controlled by ignition switch.
Sorry about that.

[dutchie]

Mmm would it be of any help if I try to get the Japanese VX's work manual...we also have TOD and 2 hi, like the trooper...

[Nazrat]

Originally posted by dutchie
Mmm would it be of any help if I try to get the Japanese VX's work manual...we also have TOD and 2 hi, like the trooper...

Yes! I'll buy you a beer next time that you are in town if you can come up with that

-Tad

[Daver]

There are 3 possible modes for VX:

1. Regular TOD mode.
2. TOD Off, Clutch Solenoid ON (50/50 HI)
3. TOD Off, Clutch Solenoid OFF (2WD HI).

To prevent Check TOD error, the TOD control unit must be connected to the dummy load.
Provided diagram shows how to do this.

You need two switches. One for TOD ON-OFF, and second to
switch between 50/50 HI or 2WD HI.


Relay 1 used for locking Clutch ON-OFF Switch in TOD ON mode.
Relay 2 used to connect Clutch Solenoid (In TOD ON mode) or Dummy load (in TOD OFF mode) to the TOD Control Unit.

Heh. So I couldn't resist trying this anyway. Fun to build, but no, it doesn't work as Tone said it wouldn't.

It does work as a TOD disconnect without the Check TOD light, but feeding 12V directly to the clutch solenoid (both switches on) did not get me 50/50.

Oh well.

-Daver