Diagnostic System Check

Test Description
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. The PCM stores DTCs that are related to the engine cooling system. Diagnose PCM DTCs related to engine cooling first.