early 4L60E holden PWM TCC

[ari666]

looking to upgrade my TH700-R4 to a 4l60E so i can use HP_tuners and my 0411 pcm to set shiftpoints and whatnot rather than that bollucks TV cable, but i need to know if the PCM is capable of driving a regular TCC on/off signal, rather than the PWM signal that the later transmissions use.


more info? ok.


the early early 4l60E here in OZ was a th700r4 with an updated valve body for electric shift (they ditched that fkn god-aweful TV cable) everything is pretty much exactly the same as a T700 and still used an on/off signal to engage TCC, whereas when they upgraded to the 2 piece 4L60E that most LS1 users are accustomed to, they went PWM TCC lock.

what im wondering is: can i use the PWM output to engage TCC?

[MikeOD]

looking to upgrade my TH700-R4 to a 4l60E so i can use HP_tuners and my 0411 pcm to set shiftpoints and whatnot rather than that bollucks TV cable, but i need to know if the PCM is capable of driving a regular TCC on/off signal, rather than the PWM signal that the later transmissions use.


more info? ok.


the early early 4l60E here in OZ was a th700r4 with an updated valve body for electric shift (they ditched that fkn god-aweful TV cable) everything is pretty much exactly the same as a T700 and still used an on/off signal to engage TCC, whereas when they upgraded to the 2 piece 4L60E that most LS1 users are accustomed to, they went PWM TCC lock.

what im wondering is: can i use the PWM output to engage TCC?

The PWM Lockup on the 4L60-E did not come with the 2 piece case/bellhousing, it came in 1995 behind the LT1 (when it was a 1 piece case still). A 1994 4L60-E just locks up, a 95+ uses PWM.

Anyways, to answer your question, these 2 screen shots show you the way GM did it with the LT1, (since the 8051 PCM was used with both 94's and 95's). Look at what they did with the duty cycle in 94 vs 95. I don't see an apply "rate" table in the LS1 PCM files I'm looking at, but I see max and min duty cycles...I believe the rate would control the way it moves from min to max when it's commanded to lock up...so if you just set the min and max to 99.6 like GM did, I believe it will work with that older style TCC.

I also believe there was a wiring difference (1 more wire added in 1995 I think)...so I'd look up 8051 PCM LT1 wiring diagrams for 1994 and 1995 to see what was up with that.

[ari666]

thanks heaps mike. thats pretty much what i was hoping for. slightly different graph format to hp_tuner, but i directly transferable.

the wiring difference is that there is an extra pin for the PWM TCC solenoid. thats about it, all the pinouts and circuits appear to be the same.

i have the tranmission installed now, will wire it up tomorrow and see if i can make some gear changes

again, thank you muchly.