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Need some info on an 08 TBSS 4L70E

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Old 07-10-2009, 12:02 PM
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Default Need some info on an 08 TBSS 4L70E

Ok guys I need some help. I need to know which (if any) of the solenoids in the following schematic are activated when the transmission is in neutral. There is also one other solenoid in the second schematic that I have circled.

In the second schematic I need to know which (if any) of the 3 wires outlined in red, are switched to ground with the transmission in neutral. Thanks!



Old 07-10-2009, 12:41 PM
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The PCS is being turned on and fed surrent according to load even in neutral . I will have to look at the schematics for the presure switches to see which does which in a bit.
What are your trying to do?
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Old 07-10-2009, 07:00 PM
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Putting a T56 into a TBSS. The TCM is staying in the vehicle so im going to make it think that the auto trans is still there and is in neutral. This way it wont be trying to upshift/downshift.
Old 07-10-2009, 09:49 PM
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Might not be an option on the TBSS, but can you just tell the computer is has a standard in it? I think you can do it on F-Body's in HP-Tuners.

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Old 07-10-2009, 10:02 PM
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Cant do it like that in a TBSS. GM has an ECM OS for the manual Fbodys. There is no such thing for the TBSS. I have 2 ECMs installed now. Engine runs, all guages are working. I just need to wire in resistors to my tcm for the solenoids that it will be using when in neutral. Im just not sure which solenoids it uses in neutral.
Old 07-11-2009, 02:31 AM
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I found the logic chart for the trans fluid pressure switch so I dont need that info anymore. I do still need to know which solenoids are energized in neutral.
Old 07-11-2009, 09:03 AM
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Actually to keep the ECM from settimng a code during the self test on start up you would need a dummy there for all the solenoids. Still not so sure it wont set codes when the TCM sees the engine rpm rise and the MPH rise but the switch showing neutral . It may set a code for the switch being bad .
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