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rahulsingh, see if these photos clarify the kick down solenoid wiring for you:
Brown cable goes to the kickdown solenoid. Black tube is the vent hose for the removed transmission fluid reservoir.
Brown cable branches off the transmission harness above the passenger's side of the differential.
Brown cable comes down and goes over to the kickdown solenoid. (Sorry about the dirt and crud, this is a 'before' picture.)
Brown cable plug that goes into the kickdown solenoid.
Location of kickdown solenoid(black rectangular thing) under the differential, behind the transmission mount, above the metal tube from the transmission pan(with the red plastic plug in it) for the reservoir(not shown here) on the passenger's side.
Brown cable for the kickdown solenoid branching off the transmission wiring harness, down and under to the solenoid.
View of brown cable, plug, and kickdown solenoid with the transmission fluid reservoir not installed.
Plastic coupling nut and O-ring seal for transmission fluid reservoir shown for location reference.
Transmission fluid reservoir and heat shield installed for location reference. Note the brown cable snaking its way at the back right side of the reservoir.
Update for 928 gts93 speedometer,
i come to know through reliable sources that in 93 model the rear speed sensors( not sure left/right) is responsible for speedometer.... Now my rear speed sensor are perfect & front are not working... I want to check the signal at XIX relay... I have an oscilloscope, any idea how much volt/ frequency I should expect at relay terminal... I came to know that it is not a relay but a transistor ( I read it here in this site).... Any idea how to check the FCU unit ??
Thanks
Update guys..
my differential fault is completely gone now, so what I have done on this car is
1. Completed bleeding & flushing of PSD fluid
2. Replaced front RHS speed sensors, all other speed sensors are ok....
So it is possible that due to no speed value in control unit, PSD fault was there whenever car was driven..
thanks to all for your kind information & suggestions...