Transmission, TOD and hub questions.

[tom4bren]

Thanks for the info guys, sounds like I can just install the TOD off switch and get what I want.

Not Zakly.

If you're going for maximum mpg, then you'll still need the locking hubs. Without them, you're still spinning the 3rd member in your front diff & hence the front prop shaft. That'll eat up a little bit of your mpg.

[bartmanS4]

Not Zakly.

If you're going for maximum mpg, then you'll still need the locking hubs. Without them, you're still spinning the 3rd member in your front diff & hence the front prop shaft. That'll eat up a little bit of your mpg.

I think the spinning of the 3rd happens anyway due to drag in the TC. There is probably a little more drag at the wheels though without disconnecting the hubs.

[tom4bren]

I think the spinning of the 3rd happens anyway due to drag in the TC. There is probably a little more drag at the wheels though without disconnecting the hubs.

When VX is in 'Toad Mode', I get 0 miles accumulation on the odometer. I'm interpreting that to mean that nothing is making it into the tranny from either the front prop or the rear (not even a negligable turning due to viscous coupling).

[bartmanS4]

When VX is in 'Toad Mode', I get 0 miles accumulation on the odometer. I'm interpreting that to mean that nothing is making it into the tranny from either the front prop or the rear (not even a negligable turning due to viscous coupling).

I was thinking that because the rear is being driven the front will be spinning too, even though it's not being sent power. I think someone confirmed this via a GoPro camera recently. In your toad mode both front and rear are disconnected so the TC shouldn't get any input from the output so to speak.

[CatFish]

I also run manual hubs/TOD off switch. Works well and I average 1-2 MPG better with TOD off and hubs unlocked. I did thorough testing last winter to check for MPG differences and it's always slightly improved with TOD off.

I have the resistor installed and I don't get a checklight, just some whacking illuminations on the front wheels. Typically, all three front wheel bars will light up and hold.

I ran just manual hubs for a while and I definitely recommend the TOD off switch. The t-case will still try to transfer power to the front wheels and you'll feel the loss of power if the hubs are unlocked. This was common for highway driving when accelerating... TOD would try to transfer extra power to the front wheels I would end up accelerating slower.

I like that the MPG improves a little, it is not real important but it would be nice to get a little better MPG. Where did you get the TOD off switch? How hard was it to install, how long did it take?

When VX is in 'Toad Mode', I get 0 miles accumulation on the odometer. I'm interpreting that to mean that nothing is making it into the tranny from either the front prop or the rear (not even a negligable turning due to viscous coupling).

So you have less miles on the odometer than you have driven? Strange that the odometer does not count miles when the TOD is off.

VXorado, does your VX do the same thing?

[CatFish]

I hooked up the scanner and got a code, P0705 Transaxle Range Switch Circuit. I am not sure what part this is but I am going to try an find what the malfunction is by doing some searches.

If anyone knows what the best course of action should be to correct this problem please do tell me. In the mean time I will be searching.

Edit:
I found this http://engine-codes.com/tsb/tsb.php?...tsb_make=isuzu
ISUZU Technical Service Bulletin for Code P0705

Bulletin Number: IB00S007 Bulletin - Date: 2000-02-01
Component: Unknown Or Other
Summary:
On suv vehicles with automatic transmissions, some remote starter installations may cause the malfunction indicator light to set and store p0705. American Isuzu motors does not sell remote starter kits and does not recommend any particular model.

Read more: http://engine-codes.com/tsb/tsb.php?...#ixzz2dz2Vq6rw

I also found this thread:
http://www.vehicross.info/forums/showthread.php?t=14908
It appears to be part 8-96017-511-0 "Neutral Safety Switch"
I can get it but I would like to know where it goes and how hard it is to replace. I tried to search the shop manual I downloaded on line but it is not searchable and is just hundreds of scanned pages. Does anyone know what pages have the repair procedure on it? or a good picture of it's location?

[bartmanS4]

My VX manual shows DTC P0705 Transmission Range Switch
(Mode Switch) Illegal Position . . . . . . . . . . . . 7A1 30

First thing I'd check is the 15A fuse (CB 15) in the engine compartment. According to the manual "This fuse can burn due to a short circuit in the backup lamp." Does your back up light come on?

Also, Tom's toad mode has the rear drive shaft disconnected which is why his odometer doesn't advance while being towed.

[tom4bren]

So you have less miles on the odometer than you have driven? Strange that the odometer does not count miles when the TOD is off.

Also, Tom's toad mode has the rear drive shaft disconnected which is why his odometer doesn't advance while being towed.

Yah, 'toad mode' = being towed (4 down).

I only pointed out the 0 miles accumulation on the ODO (when being towed) to stress the point that you should do both the TOD disconnect and the locking hubs for best results. It's all well and good to cut power going to the front but if the front end is still spinning, then you really aren't reaping the full benefits.

[CatFish]

My VX manual shows DTC P0705 Transmission Range Switch
(Mode Switch) Illegal Position . . . . . . . . . . . . 7A1 30

First thing I'd check is the 15A fuse (CB 15) in the engine compartment. According to the manual "This fuse can burn due to a short circuit in the backup lamp." Does your back up light come on?

Also, Tom's toad mode has the rear drive shaft disconnected which is why his odometer doesn't advance while being towed.

Thanks I checked the fuse and it looked fine but I replaced the fuse anyway. I cleared the codes last night, so if the code reoccurs I can then look at replacing a part.
FYI: the CB 15 fuse is in the side panel of the dash, the engine compartment fuses are EB #s so if you are looking for a fuse the CB fuses are in the dash and the EB fuses are in the engine bay.

Well on the way to work the indicator light started to flash between neutral and drive and the shifting started to slam from first to second and second to first on down shift, so I shut it off and when I restarted it is was normal again. I am want to order the part but code P0705 says it is the "Transaxle Range Switch Circuit" but when I go to the Isuzu parts page I do a search for Transaxle Range Switch Circuit and there is no such part shown under that name, but after doing a few searches I found it is also called the "Neutral safety switch" does this sound right to you guys? I was looking here http://www.stcharlesautoparts.com/ I did find the neutral safety switch but no picture showing location, is it in the same place as the Trooper?

Should I replace the switch or could it be something else causing the issues?

I did have to replace this same part in my 96 Trooper not long after I put in the remote starter in it too.

Code Page:http://www.vehicross.info/forums/sho...ighlight=P0705
Other Code page: http://www.troublecodes.net/isuzu/iszuobd2/