I think the images were just too big, I made them smaller and now they upload just fine on here.Quote:
Originally Posted by jshelto
Attachment 153255
Attachment 153257
Attachment 153258
Here's an article that is a bit helpful about this issue and what the inductive spikes are supposed to look like https://www.transmissiondigest.com/august-2018-issue/ I will repeat one last time and you diced what you want to do, but this article makes it sound clear cut when in real life it is not. I am pretty darn good with a scope, I have spent countless hours trying to do what you are trying to do, and I was never able to prove for sure if it was the usual bad computer or an actual solenoid circuit issue unless of course those easy one where it is not intermittent.
Keep in mind that when it goes to limp home mode after setting the codes and you see the computer turning off the power to the transmission, you then have to go back in time in your scope recording to try and see if it did what the conditions below say it needs to do to set the code or not.
P0765-UD SOLENOID CIRCUIT
For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .
THEORY OF OPERATION
Six solenoids are used to control the friction elements (clutches). The continuity of the solenoid circuits is periodically tested. Each solenoid is turned on or off depending on its current state. An inductive spike should be detected by the PCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a gear ratio or pressure switch error occurs. In this case, one failure will result in the appropriate DTC being set. The MIL will illuminate and the transmission goes into neutral, if the DTC is set above 35 km/h (22 mph), Limp-in mode when vehicle speed is below 35 km/h (22 mph).
WHEN MONITORED
Initially at ignition on, then every 10 seconds thereafter. The solenoids will also be tested immediately after a gear ratio error or pressure switch error is detected.
SET CONDITION
Three consecutive solenoid continuity test failures, or one failure if test is run in response to a gear ratio or pressure switch error.
