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Retrieving Codes
KOER SELF TEST (MCU SYSTEMS)
69 Chapter 4
NOTE: For vehicles with 2.3L HSC (High Swirl Combustion)
engines: Locate vacuum tee and restrictor in the thermactor
vacuum control line, and uncap during KOER Test Reconnect
after testing is completed.
1. Turn ignition off.
2. Press the ON/OFF Button to turn Code Reader OFF, then
connect the Code Reader to the vehicle's test connector.
■ MCU systems are equipped with only one 6-pin
connector (see page 18 for details).
3. Turn Code Reader ON, then
press and release TEST/HOLD
button to place the Code Reader
in TEST mode.
■ Three zeros should be visible
on the display at this time.
4. Start the engine.
■ For In-Line 4 And In-Line 6 engines, do the
following:
Gradually increase engine speed to 3,000 RPM and
hold this speed until codes appear on the Code
Reader's display.
When codes begin to appear on the Code Reader's
display, return engine speed to idle. Proceed to step 5.
■ For V-6 or V-8 engines, do the following:
Gradually increase engine speed to 2,500 RPM and
hold for 2 minutes, then reduce engine speed back to
idle.
Turn off engine. Restart engine and let idle. Proceed
to step 5.
5. Read diagnostic trouble codes on the Code Reader's display.
■ A square icon on the right
hand side of the screen will
appear and flash each time
the Code Reader receives a
code, and then the code will
be displayed on the Code
Reader's screen.
4
CYL
R
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