The Trainer

In this episode using a diagnostic platform and its multiple features will aid in an efficient diagnosis of a transmission related driveability concern. Beginning in the driver's seat, a global scan for DTCs will be carried out followed by a comprehensive road test capturing graphed transmission data PIDs for analysis. This will lead to logical testing of the solenoids and related circuitry responsible for delivering the pressurized hydraulic transmission fluid to the respective hydraulic components internal to the transaxle. Stick with Motor Age magazine’s Technical Editor Brandon Steckler as he walks you through a logical approach to automatic transmission analysis and diagnosis.
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[@JesseAutoDiag]

Thank you for the great content! I do own a 919 myself. I never thought of using a current clamp for shift solenoids "Thanks!" I am looking forward to see more content like this in the future!

[@brandonsteckler1307]

Thank you! I'm so glad you took something away from the video.

[@jasonstaub3045]

Sir u explain this so beautifully. Ty!

[@brandonsteckler1307]

Thank you so much!

[@cheapers1952]

I did not even think about using current probes 25 years ago but I have been using actual lab scopes since the 1980's even though they were not dso type

[@elevatemuhammedpbuh5733]

Mr Steckler, you are invaluable to the automtive diagnostician community. Thank you sir!
Do you know what aftermarket scan tool was used to show the main and countershaft pid that indicates where the fault could be?

[@MotorAgeMagazine]

Thank you very much. Brandon was using an old Snap-on MODIS for that capture.

[@cheapers1952]

Sorry I forgot to tell you you're doing a great job 👍

[@MotorAgeMagazine]

Thank you!

[@robertmobileman8304]

Great video and priceless info , thanks Brandon

[@MotorAgeMagazine]

My pleasure, thank you for viewing and the feedback. Truly appreciated.

[@7minnow]

Great Job!!

[@MotorAgeMagazine]

Thanks!

[@MotorAgeMagazine]

Thank You!

[@andrewsorenson2267]

How would you test linear force solenoids (CIDAS) such as the ones we see in Ford's 10R transmissions. Service info states "Zero current equals zero pressure and maximum current equals maximum pressure" I'd test it the same way but maybe I will not see a pintle bump so how might I rule out a mechanical issue with this type of solenoid?

[@MotorAgeMagazine]

Great question...there are four possible ways to test them (depending on testing capabilities) and I recommend all four, starting with the easiest test.
1) Begin with the scan tool vs. pressure PID or gauge pressure (assuming there is a test port). Reference a pressure vs. amperage chart available in service information and then command the solenoid accordingly. The pressure should match the chart specifications.
2) The solenoid can be tested manually. Energize the solenoid digitally (instead of PWM) and look for the pintle bump, keeping in mind the limitation of the test. You won't know the capability of the hydraulic circuit as a whole to deliver the pressurized fluid properly but you should see evidence of the spool valve shuttling (just as i demonstrated in the video).
3) With the solenoid on the bench, use a PWM tool to slowly increase the duty cycle to the solenoid. You should see the spool valve shuttle without binding, in both directions.
4) There is also a resistance test across the solenoid, but the results should be taken with a grain of salt. A failure of resistance to stay in specifications is definitely a failure. However, a resistance test that passes does not truly indicate if the solenoid will perform properly under normal operating conditions.