4l80e 4th gear and tcc problem (running from 4L60E segment)

[joecar]

...
I swaped the tan (ground) tcc wire to e11 and drove the truck with nothing in e10. The truck for the first time in the build drove threw all 4 gears with the tcc locking up as need in 4th and i believe in 3rd if you are going the right speed.
...

4L60E:
E10 = TCC (on/off) signal - tan/blk
E11 = TCC PWM signal

4L80E:
E10 = nothing
E11 = TCC PWM signal

[joecar]

Glad you got it working...

[slow67]

4L60E:
E10 = TCC (on/off) signal - tan/blk
E11 = TCC PWM signal

4L80E:
E10 = nothing
E11 = TCC PWM signal

X2, there is only 1 solenoid for TCC on 80E. 60E has 2.

Also glad you got it working

[kkustomz]

Thank you for the help !!!!

[MyM8V8]

This is a great success story which is nice to hear. Well done to the technical guys for the information.

[joecar]

To drive a 4L80E transmission from a 4L60E segment:
- discard the 3-2 control solenoid signal.
- drive the 4L80E 2-3 shift solenoid by using a relay to invert the 4L60E 2-3 shift solenoid signal;
- drive the 4L80E TCC PWM solenoid from the 4L60E TCC ON/OFF signal (discard the 4L60E TCC PWM signal), see TCC PWM alternative below;

TCC PWM alternative (see posts #27 and #29 below, thanks GNXClone/Mike):
use the 4L60E TCC ON/OFF signal to drive a relay to gate the 4L60E TCC PWM signal to the 4L80E TCC PWM solenoid:



(see post #29 below)


Note:
The F-car 4L60E segment keeps the TCC locked on closed throttle decel (until vss goes below the unlock curve).
The Truck 4L80E segment (there are no car segments) unlocks the TCC on closed throttle.

[GNXClone]

E10 = 4L60E TCC (on/off) signal
E11 = 4L60E TCC PWM signal

4L60E: both signals are needed to apply the TCC:
the TCC PWM signal is ramped up and the TCC (on/off) signal is switched ON.
NOTE: whenever the TCC (on/off) signal is off, the ECM will still cycle the TCC PWM signal up/down.

4L80E: has only one circuit to apply the TCC:
the TCC PWM signal is ramped up.

So you can't use the 4L60E TCC PWM signal to control the 4L80E TCC PWM circuit... use the 4L60E TCC (on/off) signal instead.

Resurrecting this old thread.

JoeCar, I have an idea for controlling the 4L80e TCC using BOTH TCC signals from the 4L60e controller.

Why not connect the TCC PWM signal line to the 4L80e via an external relay, then use the TCC on/off to control that relay? This way you can still enjoy TCC PWM apply if you desire, instead of the harsh "feels like a gear change" apply.

I plan on using this method to control the 4L80e in my GTO using the OEM 4L60e controller. I'll report back in a few weeks when it's all together and running.

Regards,
-Mike

[Taz]

Hello Mike,

Interesting idea ... have never tried it. A word of caution ... keep a close eye on whatever relay is subject to the PWM signal. Sometimes generic relays won't survive the PWM signal (rapid on/off cycling) for very long and eventually burn out.

Have had customers trying to run E-fans with an E38 ECM (using a Corvette tune) - which uses a fan module from the OEM ... but had used a truck style harness with relays .... which burned out frequently.


Regards,
Taz

[GNXClone]

Hello Mike,
Interesting idea ... have never tried it. A word of caution ... keep a close eye on whatever relay is subject to the PWM signal. Sometimes generic relays won't survive the PWM signal (rapid on/off cycling) for very long and eventually burn out.

Thanks Taz. That did occur to me, which is why I would run the PWM through the relay, meaning, the PWM is not activating the relay, the relay is simply conducting the PWM signal between the controller and the transmission. The on/off signal on the other hand is what energizes the relay.

The PWM signal will only energize the TCC solenoid inside the transmission, but only if the TCC on/off signal is on.

Like this:

[joecar]

Hi Mike,

Yes, that will work, that's a good idea, the 4L60E TCC On/Off signal gates the 4L60E TCC PWM signal thru to the 4L80E's TCC PWM solenoid...
this allows you to adjust the TCC apply feel via the TCC tables

the relay is being gated by the TCC On/Off signal (not the TCC PWM signal), so the relay will be ok.