Scan Tool User Guide 31
Read Codes
6: Diagnostic Trouble Codes
KOEO Self Test (Ford / Mazda)
The KOEO Self Test is a key-on, engine-off, DTC-
reading function that lets you read MECS slow codes
for the selected ECU.
NOTE: This test may require special cables and adapters.
1 Follow the steps in Read and Display Codes
on page
27 to start the self test.
Figure 6.9: Information or Instruction Screens
2 Several instruction screens appear. Read the screens
and follow all instructions. If necessary, use the
function keys to answer any questions. Do this until
the “Test completed” screen appears.
Figure 6.10: Read Codes Test and Instruction Screens
3 Press the Exit function key and wait for the Diagnostic
Menu screen to appear.
NOTE: Use the Review Codes function to view a list of
any codes that were read. For details, refer to Review
Codes on page 37.
Self-Diagnostics (Ford / Mazda)
The Self-Diagnostic function lets you manually acti-
vate system tests that check for DTCs. The tests
usually include a key-on, engine off (KOEO) test and
a key-on, engine-running (KOER) test.
1 Follow the steps in Read and Display Codes on page
27 to display the Self Diagnostics screen.
Figure 6.11: Self Diagnostics Screen
2 Select KOEO Self Test or KOER Self Test and press
the ENTER key. This displays a test instruction screen
(Figure 6.12
).
Figure 6.12: KOEO and KOER Self Test Instruction Screens
3 Follow the instructions on the screen and press the
OK function key to start the test.
WARNING: Maintain adequate clearance around
moving components or belts during testing. Moving
components and belts can catch loose clothing, body
parts, or test equipment and cause serious damage or
personal injury.
Figure 6.13: KOEO an KOER Self Test Screens
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