Diagnostic Table

Diagnostic tables are an organized and systematic approach to diagnosing a Diagnostic Trouble Code (DTC).

The table consists of five separate columns:
^ Step number
^ Action
^ Value(s)
^ Yes
^ No

The step number indicates which step is being performed. The action column contains all necessary information about how to perform a certain test. The last sentence in each action block will always be a question. The question can only be answered yes or no. The answer to the question will dictate which column you will go to next - yes or no. The value(s) column will contain any specifications that you are asked to test for. The yes or no answer to each test will lead you to the next step to be performed or a particular action to take. Most boxes will have a Go to Step X statement. If a yes or no block does not have a Go to Step X statement, the text inside that block will be the last instruction given in the table. The instruction will either be a solution (repair), a Fault Not Present, or a Go to Diagnostic Aids. 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.