The bottleneck of the wiring is the connectors. Ultimately, you will have to revise or replace the connector pins. To pull out the pin, you can use a thin awl or tubes from the telescopic antenna of the old pocket radio, selecting the tube according to its diameter.
The contact may be at the point where the wire is connected to the metal pin. The pin itself may be loose. Spray with contact cleaner, or at least wd40. It is better to disassemble the connector and solder where the wire connects to the pin.
If one contact is broken, then others are broken...
Can you insert the probes into the solenoid A connector, turn on the ignition and move the all wiring harness and connectors, and observe the multimeter readings?
There are no miracles in electricity, only bad contact. It is necessary to ring every wire from the red connector to the solenoids, sensors and switches. Guided by this scheme.
@CBR consulting
Is P0748 still not clearing? Are there any other error codes? If you disconnect the connector on solenoid B, will P0778 appear? After connecting solenoid B back, does the error reset?
Allows you to monitor engine and transmission parameters. everything that TECH2 reads. You can record it in a log, display it on graphs and play back and analyze it. About teaching blending, I'm not sure, I have THECH2 for that. You can try without a license with the pill. If you like it...
The ELM327 scanner costs a penny - less than $10. The ScanXL application has a "pill" for trial use. And there are a lot of free applications for Android. for bluetooth version ELM327 which allows you to read and reset errors.
Is there 5V on pin 20and 21of the red connector? Is this 5 volt reaching the temperature sensor? We measure everything when all connectors are connected and the ignition is on
Did you install another TCM? Assuming that the TCM is working properly. You should try connecting with another...