Diagnostic Tests; Key-On Engine-Off Tests; Standard Test; Standard Test Using Est - Navistar International DT 466 Diagnostic/Troubleshooting Manual

Diagnostic Tests

WARNING: To avoid serious personal injury,
possible death, or damage to the engine or
vehicle, make sure the transmission is in park
or neutral, parking brake is set, and wheels are
blocked before doing service bay diagnostics on
engine or vehicle.

Key-On Engine-Off Tests

Standard Test

The KOEO Standard test is done by the ECM. The
technician runs this test, using the EST or the CRUISE
ON and RESUME/ACCEL switches.
During the KOEO Standard test, the ECM does
an internal test of its processing components and
memory followed by an Output Circuit Check (OCC).
The OCC evaluates the electrical condition of the
circuits, not mechanical or hydraulic performance of
the systems. By operating the ECM output circuits
and measuring each response, the Standard test
detects shorts or opens in the harnesses, actuators,
and ECM. If a circuit fails the test, a fault is logged
and a DTC is set.
The ECM checks the following circuits:
• Injection Pressure Regulator (IPR)
• Brake shutoff valve (optional)
• Engine Fan (EFAN) (optional)
• Radiator Shutter Enable (RSE) (optional)
When the OCC is done, the DTC window will display
DTCs, if there are problems.

Standard Test Using EST

1. Set parking brake to ensure the correct signal
from the Electronic System Controller (ESC).
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.
2. Turn the ignition switch to ON. (Do not crank the
engine.)
Figure 59 Standard test
3. Select Diagnostics from the menu bar.
4. Select Key-On Engine-Off tests from the drop
down menu.
5. From the KOEO Diagnostics menu, select
Standard and Run to start the test.
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.
71