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Originally Posted by intelisevil
I can't help with a technical explanation, but here is some basic info:
Low or no resistance = higher hydraulic pressure = harder shifts.
Higher resistance = lower hydraulic pressure = softer shifts.
Too much resistance = too low hydraulic pressure = no shifts(?), lots of slippage, creating excessive heat = BAD, ultimately dead tranny.
I thought I had read that the maximum resistance to use was 62.5 ohms. Sorry, I can't find that thread to confirm.
Good Luck,
Dan
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The above should read :-
HIGH resistance, or OPEN CIRCUI i.e. no resistor or connection, = harder shifts. (Less or no bias supply.)
LOWER resistance, = softer shifts. (Increased bias supply.)
Too LOW a resistance, (excessive bias supply), = too low hydraulic pressure = no shifts(?), lots of slippage, creating excessive heat = BAD, ultimately dead tranny.
N.B. Specified value 12 ohms. Maximum resistance 15 ohms. Minimum 9 ohms. (All as specified in the Subaru Manual.)
The resistor circuit provides a steady positive bias supply, which is applied, in addition to a variable pulse width modulated control current. The resulting modulated current pulses duty soleniod A, in order to adjust fluid pressure as required.