Communication System Diagnostic Preview Notes

Communication System Diagnostics
Before proceeding to the J1850 or ISO 9141 communication network Diagnostic Trouble Code (DTC) indexes to diagnose a network DTC:

- Review equipment level of vehicle.
- Make note of module and systems with which vehicle is not equipped.
- Before performing a pinpoint test, make sure DTC being diagnosed is referencing a module or system with which the vehicle is equipped.
- The New Generation Star (NGS) Tester may produce a network DTC for no communication if the vehicle is not equipped with the suspect module or system.
- The NGS Tester will interpret a not equipped module as a communication failure.
- If a DTC is retrieved for a not equipped module or system, disregard this DTC.
- If a not equipped DTC is the only DTC retrieved, the communication system self test should be considered passed. Pinpoint Tests