5R55w transmission showing p0775, p0732, p0735 ford explorer and ford ranger forums – serious explorations gas news australia

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Click to expand…I just got around to changing the solenoid block with a known good one that worked. I even rebuilt "Pressure Control Solenod A", "B" and ‘C". Can’t remember which video I watched on Youtube, but they did a good job showing how to make sure and fix the disc and pins so they weren’t sticking. Shift Solenoids, "A", "B", "C", "D" all ohm out to around the middle of the Resistance Ohms range. 24 ohms (range 16-45), Pressure Control Solenoid "A", "B", "C" are also around the middle of the range. 5.0 ohms (range 3.3-7.5). TCC Solenoid Ohms out at 10.3ohms, (range 9-16) .

Before reinstalled the block, I checked continuity at the PCM connector, #13 female pin, in the middle of the 3 connectors on the fire wall to the #1 female pin at the transmission case connector. Continuity check out to be zero, so this tells me there is no open circuit.

So far I have replaced the Valve Body, rebuilt and replaced the Solenoid block, and replaced the OD Servo. When I rebuilt the transmission, I had the new brass bushings installed in the case servo bores. I’m still have a high shift into 2nd gear and the TCC is not locking up, with the P0775 code.

So frustrating. In my ATSG transmission book, a P0775 is defined as a Pressure Control "B" solenoid, shorted circuit. Do I need to start looking for shorts in the harness? What is the best way? Or could my PCM not going to ground on Pin #13 at the middle PCM connector?

Click to expand…Not sure what you mean by "the leak out of the Release Port is concerning". I apply air to the 4th Band Apply port, I hear and feel a sound, and the 4th Band Release port expels air. This is the band applying problem. The same thing happens when I apply air to the 2nd Band Apply port and the air is expelled through the 2nd Band Release Port. This is the intermediate band that works perfectly and there is no problem. I can apply air to either of the Release ports and air is held until I remove the air nozzle with a sudden gush. When I installed a new OD Servo, I made sure that there was no drastic slop with the servo pin and brass bushing bore. I can’t believe that it would be worn out in 10,000 miles either.

In my research, I saw a test where you could back probe the power source pin #3 and the pin for the PCB. Installing a pressure gauge at the PCA & PCB test port on the side of the transmission next to gear shift lever. This was done with a Scanner. With the scanner you can increase or decrease the voltage to the solenoid and watch pressure and voltage of the power source #3 pin and the pressure control solenoid "B". This would determine if I have any leakage. Problem is, I don’t have a $1000 scanner.

With PCM connector disconnected and F-37 fuse pulled, ohms checked out okay on all the 4 shift solenoids (23.4@16-45 ohms), the 3 Pressure control solenoids check out at 5.2 ohms@3.3-7.5), TCC solenoid checks out at 10.3 ohms@9-16 ohms. All 3 speed sensors check out fine. Note: All of this was tested through the PCM to Transmission Case Connector wiring harness. Basically the same ohm check with the solenoid block out. I bench tested the solenoid block and rebuilt. Checks out fine. Turbine Speed Sensor, Output Speed Sensor, and Intermediate Speed Sensor all check out within OHM range through the wiring harness and bench testing.

Removed Valve Body, Reverse Servo, and Solenoid block again. Air checked the OD Servo band through the 4th Band Apply port and made sure that air was expelled through the 4th Band Release port. Checked out fine, no blockage.with band movement. Air checked the Intermediate Servo band through the 2nd Band Apply port and made sure that air was expelled through the 2nd Band Release port. Band was engage just the same as OD band.

Test drove the vehicle for 10 plus miles. Still not shifting into 2nd and 5th gear. Test drove later that day and all of a sudden it was shifting into 2nd and 5th gear perfect. When I came to a stop, sometimes it would shift into 2nd and sometimes not. Next day it was actually shifting into 2nd and 5th more frequently. MORE NOT SHIFTING CORRECTLY, THAN SHIFTING CORRECTLY.

Looks like to me, that the problem is not mechanical. Replaced Valve Body, rebuilt Solenoid Block and bench tested, Tested Solenoid block through wiring harness. Problem seems to lie in the wiring, inputs, or maybe PCM. Maybe semi broken strands on the pin 1 wire of the Pressure Control Solenoid "B" to pin 13 of the PCM connector.(Light Blue/Pink)

With PCM connector disconnected and F-37 fuse pulled, ohms checked out okay on all the 4 shift solenoids (23.4@16-45 ohms), the 3 Pressure control solenoids check out at 5.2 ohms@3.3-7.5), TCC solenoid checks out at 10.3 ohms@9-16 ohms. All 3 speed sensors check out fine. Note: All of this was tested through the PCM to Transmission Case Connector wiring harness. Basically the same ohm check with the solenoid block out. I bench tested the solenoid block and rebuilt. Checks out fine. Turbine Speed Sensor, Output Speed Sensor, and Intermediate Speed Sensor all check out within OHM range through the wiring harness and bench testing.

Removed Valve Body, Reverse Servo, and Solenoid block again. Air checked the OD Servo band through the 4th Band Apply port and made sure that air was expelled through the 4th Band Release port. Checked out fine, no blockage.with band movement. Air checked the Intermediate Servo band through the 2nd Band Apply port and made sure that air was expelled through the 2nd Band Release port. Band was engage just the same as OD band.

Test drove the vehicle for 10 plus miles. Still not shifting into 2nd and 5th gear. Test drove later that day and all of a sudden it was shifting into 2nd and 5th gear perfect. When I came to a stop, sometimes it would shift into 2nd and sometimes not. Next day it was actually shifting into 2nd and 5th more frequently. MORE NOT SHIFTING CORRECTLY, THAN SHIFTING CORRECTLY.

Looks like to me, that the problem is not mechanical. Replaced Valve Body, rebuilt Solenoid Block and bench tested, Tested Solenoid block through wiring harness. Problem seems to lie in the wiring, inputs, or maybe PCM. Maybe semi broken strands on the pin 1 wire of the Pressure Control Solenoid "B" to pin 13 of the PCM connector.(Light Blue/Pink)