2002 Toyota Rav4 P0758 Solenoid B. How to fully test for this concern. Rafael in VA

[@zilog357]

Just replace the 811600-4623 (it is a PWM driver) and check the soldering of the nearby schottky diodes on both sides of the board. When a solenoid issue is not resolved on those units no matter how many tests and checks I do, replacing the chip, or actually the 3 chips will fix it. I say 3 chips, because the one nearer to the terminal is the VVT-i driver.

[@mikem5475]

Guessing on waveforms of a solenoid control? Is just odd. It either provides current or it doesn't, no? Is the shift a pulse width modulation? I'm confused

[@MaicSalazarDiagnostics]

@@mikem5475 yes it is a pulsed voltage signal to control the solenoid. That with the resistance of the solenoid will also control the amperage.

[@mikem5475]

@@MaicSalazarDiagnostics what is the code set criteria? I'm confused how the computer sets a MIL for a solenoid

[@nickayivor8432]

Enjoy your evening with all your family around you,Maic Salazar Diagnostics 👍 SHREWD,Maic Salazar Diagnostics Take care,Maic Salazar Diagnostics From Nick Ayivor from London England UK 🇬🇧 ⏰️ 07:39AM Good Morning 🙏 🌧 and more 🌧

[@MaicSalazarDiagnostics]

@@nickayivor8432 thank you Nick

[@mikem5475]

Why not just test transmission with manual control to see if the issue is mechanical or within the transmission?

[@MaicSalazarDiagnostics]

@@mikem5475 not sure what are you talking about? Also here I am testing the ECM, this is number one failure for this vehicles.

[@mikem5475]

@@MaicSalazarDiagnostics you can make a solenoid shift the transmission with wires and a switch, to make sure the issue isn't mechanical or electrical

[@tonycastro6154]

THIS SOLENOIDS TEND TO FAIL,,THEY NEED TO BE REPLACED,,,HAD MANY CARS LIKE THIS,,THEY A PAIN TO REPLACE,,ITS NOT THE ECM,,,