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OBD-II/EOBD OBD-II/EOBD Menu
Manual Protocol Selection
Communication protocol is a standardized way of transferring data between an ECM and a
Diagnostic Tool. Global OBD may use the following communication protocols:
• ISO 15765-4 (CAN)
• ISO 27145 (WWHOBD CAN)
• ISO J1939 (CAN)
• ISO 9141-2 (K-LINE)
• SAE J1850 PWM (Pulse Width Modulation)
• SAE J1850 VPW (Variable Pulse Width)
• ISO 14230-4 (Keyword Protocol 2000)
• SAE J2284/ISO 15765-4 (CAN)
When initially attempting to establish communication with the ECM the Diagnostic Tool attempts
to communicate trying each protocol in order to determine which one is being used. During normal
operation the communication protocol is automatically detected. If automatic detection fails,
communication protocol can be manually selected.
Using unsupported OBD communication protocols may activate warning lights and can set
network related faults. Only use the manual selection option when OBD protocol is already known.
Select Manual Protocol Selection to open a menu of options (Figure 5-8).
Figure 5-8 Manual protocol selection menu
Select the Back icon or press the N/X button to return to the OBD-II/EOBD Main menu.
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