OBD-II/EOBD OBD-II/EOBD Menu
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($0A) Emission Related DTC with Permanent Status
This option displays a record of any “permanent” codes. A permanent status DTC
is one that was severe enough to illuminate the MIL at some point, but the MIL may
not be on at the present time.
Whether the MIL was switched off by clearing codes or because the setting
conditions did not repeat after a specified number of drive cycles, a record of the
DTC is retained by the ECM. Permanent status codes automatically clear after
repairs have been made and the related system monitor runs successfully.
Connector Information
This option opens a database of vehicle diagnostic connector locations that
includes most makes and models. The menu driven interface leads you quickly to
difficult to find test connectors.
z To locate a vehicle diagnostic connector:
1. Select Connector Information from the System menu.
A list of vehicle manufacturers displays.
2. Select a manufacturer from the list.
A list of models available from the selected manufacturer displays.
3. Select a model from the list.
If a cable adapter is needed, which one and how to connect it displays.
4. Select Continue.
Information on where to locate the vehicle diagnostic connector displays.
5. Select Continue to return to the System 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 10-8).
Figure 10-8 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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