Diagnostic System Check

TEST DESCRIPTION

Step 1 - 9:

The number(s) below refer to the step number(s) on the diagnostic table.
3. Lack of communication may be due to a partial malfunction of the Class 2 serial data circuit or due to a total malfunction of the Class 2 serial data circuit. The specified procedure will determine the particular condition.
4. The symptom list in Symptoms will determine the correct diagnostic procedure to use.
5. The presence of DTCs which begin with "U" indicate some of the modules are not communicating.
7. Tests for the presence of DTCs related to Starter and Generator control circuits, due to a wiring malfunction or system voltage being high or low. The specified procedure will determine the particular condition.