Diagnostic System Check

TEST DESCRIPTION

Steps 1-7:

The number(s) below refer to the step number(s) on the diagnostic table.
2. 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.
3. Checks for DTCs for each module of the system.
4. The presence of DTCs which begin with "U" indicate some other module is not communicating The specified procedure will compile all the available information before tests are performed.

"For the description of RPO code(s) shown in this article or any of the images therein, refer to the RPO code list found at the Vehicle/Application And ID". RPO Codes