i would like to make a switch that would lock up my torque converter for freeway driving.
so far i have tried a switch that grounds the f pin on the diagnostic link, but i dont think it works.
any suggestions?

http://www.corvette-guru.com/modules/ ... hp?topic_id=14628&forum=1

or

http://www.corvette-guru.com/modules/ ... php?topic_id=7029&forum=1

I like the 2nd link better.

thanks for the response and the links!

i have a switch that connects the A pin - black w/white stripe,and the f pin - brown w/black stripe from the aldl.

i tested the switch, it's good.

but it doesn't do anything.

ill try replacing the stoplight switch and see if that does anything, as that's where the power into the solenoid flows through. maybe it's bad and the solenoid isn't getting power.

How did you test it to verify the switch was/wasn't working at unlocking the tcc?

the switch measures zero ohms when switched
zero ohms between pin a and f
no change in engine rpm when switch is thrown
cannot feel the converter locking up

i think it may be the brake switch w/ the vac line-it has 2 wires pink and purple

you can test it at the aldl without the car running and hear it click... you should be using a test light btw as the f is the return path of voltage. It will be lit if the brake switch is good. The ECM provides a ground path. When driving the test light plugged in f will go out when the ECM closes the circuit to lock it up...

i dont have a test light, but i do have a multimeter, so ill check the voltage at the aldl and at the brake switch.
thanks for the suggestion!

Welcome to another 1985!

Have you tried a simple jumper wire at the aldl port to see if that works? If so, that means the switch isn't working.

Matthew

i checked the voltage between a and f with koeo--12v.
when brake peddle was pressed--0v.
so i guess the switch is ok.

ill try the jumper wire -paperclip- and see if that does anything.

if not, it must be the connector at the tcc solenoid or the solenoid itself-how hard is it to replace the solenoid?

the trans was rebuilt 2 years ago-is the tcc solenoid normally checked and replaced?

tried the paperclip on a and f with koeo-no click.
so i guess its the solenoid

AFAIK the solenoid switch isn't replaced with a rebuild. I'll have to look in the fsm for the testing procedure.

Run a wire from the battery negative or the seat frame and koeo plug it into f. Not sure I trust pin "A" for ground sourcing. You should hear it click. Changing it is easy though. A couple 10mm bolts hold it in. You can get it with the harness or the cheaper one you splice in. There is also a fourth gear pressure switch wired into the harness. FSM has Chart C-8A for diagnostic testing. Did you drive it and see the light go out (voltage between f and ground "not A" = 0v)when the car is at temp and running steady in fourth gear?

i don't have a test light so ill have to get one and drive around and see.

i thought if there was 12v between a and f then the circuit and wiring was good, as this would be the only way that could happen.

ill try with the pin f and a different ground source and see if that does anything