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I presume the slipping was fixed with fluid change. If you disconnect the shift solenoid connector and if the tranny is placed in the “D” position it will stay in third – that is normal behavior. If you can manually shift into second and first with the connector disconnected then the problem is either in the solenoids or the control system/sensors. Have you checked the manual shifting with connector removed.
You can test the electrical functionality of the solenoids by removing them and either checking continuity with a multimeter or by applying 12V to the terminals – you should hear a click. Testing mechanical functionality is harder – if you have an air compressor you need to rig up a tube into the solenoid opening and force compressed air at about 40PSI and see if the solenoids vents the air when energized. If so the solenoid is fine.
Skipping second due to a control system fault means both solenoids are turning off simultaneously which is a bit odd. Second is generated by turning off the second brake solenoid – this closes the 1-2 shift valve which in turn activates the intermediate servo and the clamps the second brake band to the sun gear drum which locks the sun gear in place so only the planet carrier and ring gear(s) rotate.
The first test to do would be the manual shift test. If the solenoids short out I suspect that the ECU should automatically current limit – if not the circuit generating the control voltage may overheat and burn out. The brown fluid is most likely due to either burnt fluid or clutch material from the clutches or band.
As for the electrical problem – it could possibly affect the ECM and cause side effects like this.
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