WOW! School is defiantly in session!No.
The main regulator creates line pressure. It is controlled by the EPC (Electronic Pressure Control) solenoid. Line pressure is used to actuate the clutches, but not through the shift solenoids. The shift solenoids use a pressure tapped off of line, but also limited. All the shift solenoids do is move the shift valves in the valve body. The shift valves send line pressure to the clutches.
Yes, that's how it works.
Not necessarily. The converter doesn't see line pressure, it sees a pressure that is limited to 120 PSI. Line pressure can exceed 300 PSI.
One gallon per minute is the spec. I like to measure one quart in 15 seconds. That way you won't run the pan out of fluid.
Maybe that will help while the clutch is applying. Maybe.
I think I see it now.
Pump to main Regulator Valve (which limits Converter feed to 120 psi but will reduce flow to converter in an attempt to maintain line pressure.) From there flow is divided to the converter, and Line pressure which is controlled by the EPC. Control circuit is fed from reduced port off Line pressure. Electric Solenoids use the control fluid to operate the valves which send line pressure to the desired clutches.
Therefore, if i am correct in my new thinking:
A flow check would help determine position of the Regulator valve.
a) Low line pressure and high flow thru the converter, then the valve is possibly stuck open?
b) Little to no flow and low line pressure, Regulator valve is closed attempting to maintain line pressure. faulty pump? Internal leak?
c) EPC is programmed low which would give high flow and low line pressure
Does the EPC ramp up Line pressure depending on gear and engine load demands?
I am thinking the ECM has no way of monitoring the Line Pressure?
I have a live tune chip on the truck and could adjust the EPC, once I locate that feature in the tune. The tune came from a friend and I have only adjusted shift points according to my needs. So I don't know what adjustments he may have made to the line pressure. I have had no reason to think programmed line pressure was low. Shifts are always firm. I will contact him to see what was programmed.
For the flow test;
Which cooler port do you use?
I am thinking once I know which port to use, secure the hose in a bucket. Run truck for 15 seconds.
I have an old cooler bypass line. I could use it to make a valved test port and even check pressure? I could just drill and tap the head of the Banjo bolt and make a test port.
Better yet. What size are the threads in the case that the banjo bolt threads into? Possible oring boss?
I could put some fittings on with valves and look professional. Lol!