Troubleshooting the Toyota FJ80 Land Cruiser Center Diff Lock (CDL)
When I purchased my 1992 Toyota FJ80 Land Cruiser, the previous owner informed me that the four wheel drive system did not work. I knew the transfer case was a rebuilt unit so I figured it would be something simple such as a switch or a relay. Little did I know that I would spend hours trying to troubleshoot the problem. Hopefully this article will walk you through all the diagnostics needed to check the complete center diff lock (CDL) electrical system so you can figure out the problem much faster than I did.
You might ask, why did you spend hours diagnosing the problem? My answer is, I don’t like to spend money replacing parts when the part being replaced was not the problem. I’ve been a victim of paying people to do just that. Never again.
As in all repairs on the Land Cruiser, you should purchase the factory Toyota Repair Manual and the Toyota Electrical Wiring Diagram for your specific year of vehicle (order the factory manuals at techinfo.toyota.com). A Chilton’s or similar service manual won’t cut it when you are diagnosing specific issues. Invest the money in the factory manuals. It’s worth it if you (or your mechanic) does any diagnostics or repairs on your Land Cruiser. Purchasing the correct manual will pay off only after a few repairs because you will be diagnosing problems and not throwing parts at the problem until it is fixed. The reference for this article was the USA version for 1992 model year Toyota Land Cruiser. Even though there are similarities between all 80-series, there are differences between the various years of Land Cruisers and world markets so be aware of this when making repairs to your Land Cruiser.
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