diode needed in TC lockup mod??
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Fleet Mechanic
Joined: Nov 2005
Posts: 1,508
Likes: 87
From: North Carolina, Raleigh
diode needed in TC lockup mod??
I was going to finish my EBPV and TC lock up mod and was wonder if a diode is needed on Purple Yellow (PW) wire when doing the mod.
I have two diodes installed on EBPV line to prevent back feeding the PCM but on the TC you are just grounding the PW wire going to TC..
wouild not having diode between connection wire from switch and PCM cause a code.. have have seen a flashing OD line in past with way it was wired currently
.. I cut the PW wire and routed back to switch and back.. so the TC signal was routed through double pole double throw switch.
I wanted to do it simpler way by not running through switch all the time just when it was engaged by grounding it.
confusing i know..
thanks
I have two diodes installed on EBPV line to prevent back feeding the PCM but on the TC you are just grounding the PW wire going to TC..
wouild not having diode between connection wire from switch and PCM cause a code.. have have seen a flashing OD line in past with way it was wired currently
.. I cut the PW wire and routed back to switch and back.. so the TC signal was routed through double pole double throw switch.
I wanted to do it simpler way by not running through switch all the time just when it was engaged by grounding it.
confusing i know..
thanks
Thread Starter
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Fleet Mechanic
Joined: Nov 2005
Posts: 1,508
Likes: 87
From: North Carolina, Raleigh
too bad it will probable not burn down but if it does I will get a video of it. in looking at past threads on TC lock up i did not see where any one had used one. now on the PCM line to EBPV you need diodes to protect PCM from back voltage.
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
I plan to do this mod sometime in the future (it's been on my list for years) but haven't done it yet. I'm not sure what you are using as a reference but I will be using this write-up when I assemble mine:
Welcome to guzzle's TC Lockup Mod Web Page
I don't know if that helps or not.
Welcome to guzzle's TC Lockup Mod Web Page
I don't know if that helps or not.
Cargo Master
Joined: Feb 2005
Posts: 2,837
Likes: 1
This is one I haven't heard about in a while, but if my memory serves theres no need for a diode on the TC lockup. You're just grounding the signal. I had done this mod and the EBPV Exhaust Brake many moons ago, but have long since deleted the EBPV and my John Wood trans just does what its supposed to do.
Super Moderator
Joined: May 2004
Posts: 29,380
Likes: 118
From: Central Coast of CA
Nowadays, most custom tow tunes have a transmission strategy that eliminates the need for the TC lockup switch.
I had one installed by John when he put his trans in my Ex, but that was long before tuners were writing tow tunes that addressed optimum TC lockup while trailering.
Stewart
I had one installed by John when he put his trans in my Ex, but that was long before tuners were writing tow tunes that addressed optimum TC lockup while trailering.
Stewart
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Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
It's more off-roading for me. I like to cruise around and enjoy the scenery rather than pretend I'm running the Baja 1000. I'm mostly in 1st and 2nd gear. Transmission temperature isn't that much of an issue unless it's the dead of summer in the desert or I'm working my way up into the foothills then it really climbs up there. I haven't done any serious excursions since I installed the 6.0 trans cooler though. I'm sure that will make a big difference in temps but I don't know if spending a couple of days crawling around at 10-20mph takes a toll on my torque converter. I think it's already tired because if I come up on steep incline or shelf to get over I can't get the tire up it unless I'm in 4LO.
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