Single Range (Push Button) 4 Wheel Drive System Trouble Shooting

[Skip]

Just testing the waters as I did with the alternator repair article.

This article will be for the Ultimate Subaru Repair Manual if any interest is shown.

I ask you to please give any pertinent comments or suggestions.

Here is the beginning of the article.

 

This treatise is referring to the single range push button four-wheel drive system only.

 

Equipment required:

Multimeter

Vacuum gauge

 

Overview:

This system incorporates a single vacuum controlled diaphragm to engage the rear drive of the transaxle.

This diaphragm is a push pull type where the vacuum is applied to one side or the other to instigate the push or the pull on the lever that shifts the rear drive in and out of service. The control of this diaphragm is the job of two solenoids, which in turn are controlled by the four-wheel drive push button.

 

Operation;

The four-wheel drive push button is a single pole double throw switch. This means even in the 4 wheel drive “Off” position the switch still makes contact to one of it’s terminals................

[calebz]

Its great info to have. I understand it pretty well, bvut when I put my PB 4WD 5 speed into my Auto car, I had no idea.. your article would have been very useful at that point. perhaps it will be useful to someone else in that same situation

[quartus]

Looks like I'm about 6 years too late but I would love to have that article.