Diagnostic Process

Before beginning diagnosis on the 4WAL system, you need a detailed description of when the condition occurred from the owner This information can be useful in duplicating the condition Always begin diagnosis with a visual inspection of all connectors, wiring, wire routing and retention, and system components. Many times a disconnected or loose connector, blown fuse, corroded terminal, or mis-routed wire is the cause of a malfunction.

If a visual inspection does not reveal the cause of a malfunction, perform the "Functional Test." Always start with the Functional Test. This is a critical step in the quick and accurate diagnosis of any malfunction. It will direct you to the specific system area that is malfunctioning and verify the diagnostic system is functioning properly. Correct system diagnosis cannot be ensured without starting diagnosis with the Functional Test. Functional Test