converter lock up problem

TOYOTA 4RUNNER
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DRILLDOCTOR38
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I have a 1994 toyota 4 runner with a V-6 3 liter engine 4wd with 204000 kms , it will shift through all the gears til it is time for the converter to lock up and then it will only do so if I touch the brake pedal , I feel it is a ground problem and is back feeding through the brake light circuit as it won't lock up if the brake light fuse is out , any idea where the the ground wire is for the overdrive main switch is , it seems to have a light circuit in it as well any help would be appreciated thank you
Dec 22, 2006 at 8:48 PM
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RASMATAZ
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You need to check the operations of these sensors: Coolant Temp. Throttle Position, and Vehicle Speed sensors-these items has to do with proper shifting and lock-up

Note: when the brake is applied the converter unlocks-at the ECM pin STP when brake is applied you should have 12v-not applied 0v

Check all the items above prior to dealing with the solenoids in the tranny.

BTW last Fluid/Filter change on it?

HTH[/b]
Dec 23, 2006 at 2:36 AM