3 DIAGNOSTIC SOFTWARE OPERATION 75
Figure 66 Output State Low test
2. Select Diagnostics from the menu bar.
3. Select Key-On Engine-Off Tests from the drop
down menu.
NOTE: When using the EST to do KOE O or KOER
diagnostic tests, Standard test is always selected
and run first. If th e ignition switch is not cycled, the
Standard test does not have to be run again.
4. From the KOEO Diagnostics m enu, select Output
State Lo w and Run to start th e test.
5. Toggle between the Low and High tests in the
Output State Test. Listen and observe actuator
control or circuit operation.
Figure 67 Close session
6. When finished with this test, selec t Session from
menu bar, then Close.
Output State High Test
NOTE: ThistestcanonlybedonewiththeEST;
MasterDiagnostics® software is required.
The Output State High test allows the technician
to diagnose the operation of the output signals and
actuators.
In the Output State High test mode, the ECM pulls up
the output voltage to the high state. This energizes
the control high side driver circuits and actuates the
output components controlled by the ECM.
During this test, the output of the circuit in question is
monitored with a DMM. The DMM measures a high
voltage state, as the outputs are toggled. The actual
voltage will vary with the circuit tes te d.
NOTE:
• A Breakout Box or Bre akout Harness and a DMM
are required to monitor the suspected circuit or
actuator.
• DTCs are not set by the ECM during this test.
The following actuators are activated when toggled
high during the test:
• VGT vanes full closed (electrical circuit, audible,
and visual inspection of actuator arm)
• Brake Shutoff valve (optional) (electrical circuit
only)
Figure 68 Output State Test Session
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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