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My torque converter clutch (TCC) is not locking up most of the time. Every once in a while it will lock up (once a month at highway speeds of about 62mph.) I have looked in all the manuals I can get my hands on and I can't find any information on how to test to see if the trans is actually getting the signal from the ECU. The trans is a 700r4/4L60 (1992, 4.3L) they have the same scheme to lock up the clutch.

Does anyone know how the test the lock-up signal from the ECU to the trans to tell the TCC to lock?

Any help would be great!

Thanks in advance!

Rick
'92 S-10 Tahoe 4.3L Bone Stock
 

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usually its the lock-up selenoid or the convertor itself. havn't ran across the ecm not giving the signal yet, but it is possible. if you drop the pan , take out the harness w/ the seloniod any tranny shop should be able to check it for you in a matter of a minute. air check the selonoid and a current test and you you will have found youre problem( most likely) or narrowed it down to two possibilities.
 

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Thanx for the info!

I'll know what to ask for when I take it in!!
 
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