TRNW-2: TCC functional test. 4l60e

[FRANK GRIEVE]

 That is a valid test Steve, but there is no supply for the solenoid until second gear so for that test you do have to have pan off, solenoid out so you can stroke the valve manually and pump fluid supply. Preston, you should be able to turn lockup enable solenoid on after achieving second gear and watching your tcc slip speed. I test all my 4l60's with no 3rd or 4th gear before removal by putting trans in manual second, turning on my apply solenoid with the scanner and watch for a 0 tcc slip Rpm so I know how lockup is performing before pulling unit. The tcc enable solenoid functional test will enable lockup at full pwm.
    On Monday, June 9, 2025 at 06:57:53 PM CDT, Steve Everett via trnw2 <trnw2 at trnw.net> wrote:  
 
    I thought I remembered seeing that you could keep the filter in fluid by putting a hose from the filter to the pump inlet and then pushing up on the tcc valve in the pump and it should kill the engine ?   it was years ago but I swear I saw where that was done somewhere ?   it will be messy no doubt , and not sure its worth the mess,  but ?
     Steve
On Mon, Jun 9, 2025 at 4:42 PM John Lovell via trnw2 <trnw2 at trnw.net> wrote:

My guess would be no. Don't you need 2nd gear oil to stroke the L/U valve in the pump? Probably just turn solenoid off and on. Listen for it clicking.


On Mon, Jun 9, 2025 at 3:02 PM preston farmer via trnw2 <trnw2 at trnw.net> wrote:

   '07 tahoe, in the functional test for tcc, is'nt  it supposed to kill the eng with tcc on and trans in gear?  This message was sent from the TRNW Technical Discussion Forum (trnw2). You were sent this message because you have subscribed to our mailing list. If you don't want to receive these emails from TRNW in the future, please unsubscribe here:
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