![]() ![]() The first power source (Terminal 3 on the relay) is from the 30 amp fuse in the dash fuse box labeled “Diff.” This power source should be hot at all times the ignition is on. Power to the CDL relay is sent from three separate sources. Refer to the wiring diagram to follow along. Toyota FJ80 Land Cruiser Center Diff Lock Control Relay For a detailed explanation on how your 4WD system works, see Diffs for Dummies. When you engage (lock) your CDL, it splits the power 50/50 to the front and rear driveshafts regardless of the surface you’re driving on or if you are turning. During normal driving (CDL unlocked), the transfer case allows the driveshafts to turn at different speeds, so when you are turning on a hard surface, there is no binding. The FJ80 Land Cruiser is a full-time four-wheel drive (4WD) system that is equipped with a mechanical lock type center differential system. I’ll try to use the terminology used in the Toyota Land Cruiser factory service manual (1992 model year). To make any repairs to the CDL, it’s a good idea to learn a little how the CDL system works on the 80-series Land Cruiser. The 80-series Land Cruiser Center Differential System I think I would still be scratching my head over the CDL if it had not been for the wisdom contained in the 80-series forum on ih8mud. One of the best online resources that fill in the blanks where the Toyota factory manual leaves off is the 80-series on. Experience (or the experience of others) is a valuable asset to have when diagnosing problems on your vehicle. The factory service manual is not the final word for diagnosing issues. ![]()
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