
274 OBD II
DIAGNOSTIC MODE
Enhanced OBD II can be run in <NORMAL MODE> or <CHECK MODE>. Use the u
and d to select the Diagnostic Mode for Enhanced OBD II.
Use <CHECK MODE> when attempting to duplicate intermittent faults that set DTCs.
<CHECK MODE> enables the OBD II system to set DTCs easier by inhibiting two-trip
code detection logic and forcing “once per trip” tests to be run.
ACTIVE KEYS
u d Change highlighted item.
1 Select Normal Mode.
2 Select Check Mode.
e Select highlighted item.
NORMAL MODE
If Normal Mode is selected, the Tester displays the Diagnostic Menu.
CHECK MODE
If Check Mode is selected and there are stored Trouble Codes, the Tester displays a list of
the currently stored Trouble Codes. Review the Trouble Codes and Freeze Data before
proceeding.
ACTIVE KEYS
e View Freeze Data.
x Continue with Check Mode.
CHECK MODE CONFIRMATION
Perform the steps displayed on the Tester screen. Press e when the steps are
completed. When Check Mode is selected, the Tester commands the ECU to inhibit two-
trip code detection logic and automatically run the Once Per Trip tests.
ACTIVE KEYS
e Proceed to Check Mode Enhanced OBD II Menu.
CAUTION
CAUTION!
Entering the <CHECK MODE> erases all Trouble Codes and
Freeze Data.
CAUTION
CAUTION!
Make a record of any stored DTCs before entering Check Mode
because codes will be erased once Check Mode is entered.
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