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After you select OBDII Functions from the MAIN MENU the OBD II System Tester will
automatically link to the PCM and check the OBD II Readiness Monitors. OBD II
Readiness Monitors are strategies designed to test the operation of emission related
systems or components. The PCM may perform special tests on a system or
component to complete its monitor. The vehicle may have to be operated under
certain conditions to initiate a monitor. If the PCM loses power or the codes are
erased the monitors will be cleared. The OBD II System Tester will display the
condition of vehicles OBD II Monitors.
Below is an example of the screen when the OBD II readiness monitors are com-
pleted. If any of the monitors are not completed, the following screen on the right will
be displayed.
Press the down arrow key to view a list of the monitors. The monitor list consists of
the OBD II monitor name followed by the monitors condition. A monitor that is not
supported by the test vehicle will be followed
by n/a, (not applicable). A monitor that has
been completed will be followed by OK. If a
monitor has not been completed, it will be
follower by inc for incomplete.
Press the BACK key and the OBD II Function Menu will display. Use the UP and
DOWN arrow keys to scroll through the choices.
IMPORTANT: If you choose a test that your vehicle does not support, you will get a
message telling you that the test is not applicable.
Read Codes
The Read Codes function is used to retrieve Diagnostic Trouble Codes (DTCs) from
the vehicles on-board computer. Diagnostic Trouble Codes are set when the PCM
recognizes a condition outside preset ranges. A Malfunction Indicator Lamp (MIL) that
is on indicates that a DTC has been recorded. Because DTCs indicate a circuit or
system failure not component failures they are very useful in diagnosing vehicle
concerns.
NOTE: Changing parts without diagnosing the circuit or system may result in good
components being unnecessarily replaced.
Select Read Codes from the OBD II Function
Menu and press the ENTER key. The PCM will
check its memory and report trouble condi-
tions that were stored.
NOTE: If you get an Operating Error message, make sure the DLC adapter cable is
properly attached to the vehicle connector. If the problem remains, refer to
Section 4: On-Line Help and Trouble-Shooting Tips.
On-Board Readiness
Tests are Complete
Press A Key to Cont
Not All Supported
On-Board Readiness
Tests Are Complete.
Use [ To View Tests
Misfire Monitor OK
Fuel System Mon inc
Comp Component n/a[
Catalyst Mon OK
OBDII Function Menu
`1)Read Codes
2)Pending Codes [
3)Erase Codes
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