TCC solenoid wire grounded??

[84ttype]

I just had my Tranny rebuilt and the shop told me that the convertor isn't locking up. I was looking at it today and noticed that with the key on the solenoid wire isn't getting 12 volts. the 3rd and 4th switches are getting power still and i was wondering is it a constant 12 volts or does the computer send a signal? I want to know if I can just hook it up to a another 12v source through the brake light switch? or would it be better for the tranny to search out the ground and fix it.

 

[mikestertwo]

The tcc solenoid gets it's power through the brake light switch. The ECM grounds the low side of the solenoid to activate it. You may have a bad brake switch or a wiring problem at the switch or between the switch and the tcc. connector.

 

[84ttype]

Alright I'll check that out, so with NO brake should there be a voltage? or it should be grounded?

 

[turbojimmy]

Alright I'll check that out, so with NO brake should there be a voltage? or it should be grounded?

With the key on, foot off the brake you should have 12V. When you press on the brake it opens the circuit - no 12V. Usually the problem is that the switch isn't adjusted right.

Jim