Test Description

The numbers below refer to the step numbers on the diagnostic test.

1. 4  - Lack of communication may be because of 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.
2. 5  - The symptom list in Symptoms will determine the correct diagnostic procedure to use.
3. 6  - The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will collect all the available information before you perform tests.