Output State High Test - Navistar International DT 466 Diagnostic/Troubleshooting Manual

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 KOEO or KOER
diagnostic tests, Standard test is always selected
and run first. If the ignition switch is not cycled, the
Standard test does not have to be run again.
4. From the KOEO Diagnostics menu, select Output
State Low and Run to start the 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
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
3 DIAGNOSTIC SOFTWARE OPERATION
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
6. When finished with this test, select Session from
menu bar, then Close.

Output State High Test

NOTE: This test can only be done with the EST;
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 tested.
NOTE:
• A Breakout Box or Breakout 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
75