Diagnostic Table - Buick 1999 LeSabre V6-3.8L VIN K Service Manual

Diagnostic Table

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The diagnostic tables are an organized and systematic approach to diagnosing a Diagnostic Trouble Code (DTC). The table consists of 5 separate columns: step number, action, value, yes, and no. The step number indicates which step is being performed. The action column contains all information necessary to perform a certain test. The last sentence in each action block always asks a question. The question can only be answered yes or no. The answer to the question dictates which column to go to next - yes or no. The yes or no answer to each test leads to the next logical step within the diagnostic table. Most of the YES and NO boxes take you to the next logical step within the table. However, some boxes may lead to other system diagnostics, or to the Diagnostic Aids when an intermittent condition exists.

Always begin with Step 1 at the top of the table unless there is a Notice or Caution above it. Never skip steps or jump ahead in the table. Taking short cuts often leads to misdiagnosis. When a problem is found, make the necessary repairs, and then verify the repair.