06 H3
a.k.a. "The Jackal"
- Messages
- 9,506
- Location
- Meridian, ID
This is probably a question for ATVspeed or Reloader but I’ll put it here for everyone to learn as I’m sure the future will bring more modifications to the table and possibly transfer case swaps.
My issue: I installed a doubler transfer case. 1:1, 1.96:1, 2.72:1, 5.33:1. Its actually not an issue, it’s a badass setup that will greatly improve capability! It does causes issues, but I know they can be overcome.
My VSS is in a similar position to factory, it’s in the tail housing of the transfer case. Most guys that have done LS swaps in their jeeps have this issue too so to remedy it they put the VSS in the tailhousing of the trans so it always reads 1:1. I don’t want to do that, gotta pull the trans apart, drill and tap the tailhousing, etc. It isn’t a big deal if your doing it during the swap but to pull it all back out is a pain. The issue occurs that the VSS is seeing reduction in the tailhousing because the tcase is in low but the computer thinks it’s in 4 high. It freaks the **** out and cuts power, shifts weird, almost like a limp mode.
My original plan was to just bolt the encoder motor off the frame rail, push the 4low button so the computer knows it’s in 4low and we move on. Well I got too excited and drove it around and broke my encoder motor because I didn’t mount it. I kind of forgot that I left it on a skid plate and it bounced around. Instead of buying a new encoder motor to play dumb I want to actually fix it with a real solution.
So I hit the interwebs and found there is a 4low signal (I’ll post the wiring diagram) how it works is the encoder motor has wiring that goes to the TCCM (transfer case control module) behind the glove box. It then has an output that goes to the pcm that says “hey pcm! I’m in 4 low” then an output/input class 2 data wire that goes to the DIC, from what I understand it illuminates the lights and shows your 4 low button lighting up, your traction control off and stabilitrac off on the DIC and the traction light on the dash.
So to trigger the pcm 4 low signal it needs to be grounded out, so I bought a 2 prong switch, tapped into the wire between the TCCM and PCM and ground it out.
So I flip the switch and nothing on the dash lights up. I figured that may be the case. Since I tapped into the 4low switch in front of the tccm so it can’t trigger the DIC so my question is, does the pcm see a 4 low signal and cut out stabilitrac and traction control too but doesn’t illuminate it because the ground is after the TCCM? Or does it tell the pcm “use your 4 low shift tables” but leave traction control and stabilitrac engaged? I hope it disables it but doesn’t illuminate because I don’t want that crap on when in low range and the factory shuts it off in low range anyways.
With all that said, I would like to get the lights to illuminate when it’s all said and done so it looks factory but for next week I just need it to work whether the lights show up or not. I will be doing 3 days of backdoor KOH recovery. Rolling rigs over, and extracting broken ones out after the race and I don’t want to be fighting this stupid trans.
On another unrelated note, I did install a RADesigns mini rail shifter and TCC lockup. Since I have so many options hearing wise now I want to be able to start in any gear. I tapped into the TCM wiring with a on/on 6 prong switch. It allows factory control like a stock H3 with the toggle down and in the up position it gives me full manual control. If I want to start in 4th gear, I can start in 4th, it’s like a full manual valve body but still retains OE functions! Then for TCC lock up I have a on/off/on 3 prong switch. Toggle down is factory torque converter lock up, toggle in the middle is TC lock up is off, toggle up is TC lock up when I want it to. The more control I have when wheeling the better. Then flip both the switches to factory and it will allow any one to drive it like a normal vehicle.
My issue: I installed a doubler transfer case. 1:1, 1.96:1, 2.72:1, 5.33:1. Its actually not an issue, it’s a badass setup that will greatly improve capability! It does causes issues, but I know they can be overcome.
My VSS is in a similar position to factory, it’s in the tail housing of the transfer case. Most guys that have done LS swaps in their jeeps have this issue too so to remedy it they put the VSS in the tailhousing of the trans so it always reads 1:1. I don’t want to do that, gotta pull the trans apart, drill and tap the tailhousing, etc. It isn’t a big deal if your doing it during the swap but to pull it all back out is a pain. The issue occurs that the VSS is seeing reduction in the tailhousing because the tcase is in low but the computer thinks it’s in 4 high. It freaks the **** out and cuts power, shifts weird, almost like a limp mode.
My original plan was to just bolt the encoder motor off the frame rail, push the 4low button so the computer knows it’s in 4low and we move on. Well I got too excited and drove it around and broke my encoder motor because I didn’t mount it. I kind of forgot that I left it on a skid plate and it bounced around. Instead of buying a new encoder motor to play dumb I want to actually fix it with a real solution.
So I hit the interwebs and found there is a 4low signal (I’ll post the wiring diagram) how it works is the encoder motor has wiring that goes to the TCCM (transfer case control module) behind the glove box. It then has an output that goes to the pcm that says “hey pcm! I’m in 4 low” then an output/input class 2 data wire that goes to the DIC, from what I understand it illuminates the lights and shows your 4 low button lighting up, your traction control off and stabilitrac off on the DIC and the traction light on the dash.
So to trigger the pcm 4 low signal it needs to be grounded out, so I bought a 2 prong switch, tapped into the wire between the TCCM and PCM and ground it out.
So I flip the switch and nothing on the dash lights up. I figured that may be the case. Since I tapped into the 4low switch in front of the tccm so it can’t trigger the DIC so my question is, does the pcm see a 4 low signal and cut out stabilitrac and traction control too but doesn’t illuminate it because the ground is after the TCCM? Or does it tell the pcm “use your 4 low shift tables” but leave traction control and stabilitrac engaged? I hope it disables it but doesn’t illuminate because I don’t want that crap on when in low range and the factory shuts it off in low range anyways.
With all that said, I would like to get the lights to illuminate when it’s all said and done so it looks factory but for next week I just need it to work whether the lights show up or not. I will be doing 3 days of backdoor KOH recovery. Rolling rigs over, and extracting broken ones out after the race and I don’t want to be fighting this stupid trans.
On another unrelated note, I did install a RADesigns mini rail shifter and TCC lockup. Since I have so many options hearing wise now I want to be able to start in any gear. I tapped into the TCM wiring with a on/on 6 prong switch. It allows factory control like a stock H3 with the toggle down and in the up position it gives me full manual control. If I want to start in 4th gear, I can start in 4th, it’s like a full manual valve body but still retains OE functions! Then for TCC lock up I have a on/off/on 3 prong switch. Toggle down is factory torque converter lock up, toggle in the middle is TC lock up is off, toggle up is TC lock up when I want it to. The more control I have when wheeling the better. Then flip both the switches to factory and it will allow any one to drive it like a normal vehicle.
