Manual Protocol Selection
Ccommunication 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 tool automatically connects to an available protocol. If the automatic detection fails, the protocol can be manually selected.
In addition, in some situations a vehicle may use more than one protocol, and this option allows you to switch to a different protocol.
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 change the protcol.
Typical Screens from Current Diagnostic Tools Shown
