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19
Self-diagnostic lets you manually activate system tests that check for DTCs. Usually it includes a
KOEO (Key-on, engine-off) test and a KOER (key-on, engine-running) test.
To read codes from a vehicle:
1. Scroll with the arrow keys to highlight Read Codes from Function Menu and press the ENTER
key. A code list including code number and its description displays.
Figure 4-18 Sample Function Menu Screen
2. Use the up and down arrow keys to scroll through data to select lines, and left and right arrow
keys to scroll back and forth through different screens of data.
Figure 4-19 Sample Code Screen
3. Press function key Save to store DTC information. Or use the BACK key to exit.
4.1.3.2 Freeze Frame Data
Freeze Frame Data menu displays freeze frame data, a snapshot of critical vehicle operating
conditions automatically recorded by the on-board computer at the time of the DTC set. It is a
good function to help determine what caused the fault.
To view freeze frame data:
1. Select Freeze Data from the Function Menu. Details of freeze frame data displays.
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