Data Link Communications Diagnostic System Check

Steps 1 - 3:

Steps 4 - 5:

Test Description
1. This step determines if communication is good between the scan tool and the vehicle components.
2. This step inspects the Class 2 communications system connections and any DTCs that may be set.
3. This step determines if the scan tool is able to communicate with the UART Data Line, specifically within the SIR system.
4. This step determines if the Serial Data communication between the EBCM and the scan tool can be accomplished.
5. This step determines if the Serial Data communication between the PCM and the scan tool may be accomplished.