5 HARD START AND NO START DIAGNOSTICS 153
4. KOEO Standard Test
Figure 176
Purpose
To determine electrical malfunctions detected by the
ECM self-test and Output Circuit Check (OCC)
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
NOTE: If an EST is not available, see “Standard Test
Using Cruise Switches” in Section 3 (pa g e 72).
Procedure
WARNING: To avoid serious personal injury,
possible death or damage to the engine or
vehicle, read all safety instructi on s in the “Safety
Information” section of this manual.
1. Set parking brake to ensure the correct signal
from the Electronic System Controller (ESC).
2. Turn the ignition switch to ON. (Do not crank
engine.)
Figure 177 KOEO Standard Test
3. Select Diagnostics from the m enu bar.
4. Select Key-On Engine-Off Tests from the drop
down menu.
NOTE: When using t he EST to do KOEO or KOER
diagnostic tests, Standard Test is always selected
and run fi rst. If the ignition switch is not cycled, the
Standard Test does not have to be run again.
5. From the KOEO Diagnostics menu, select
Standard, then select Run to start the test.
The ECM will complete an internal self-test and
an OCC. When the OCC is over, the DTC window
will show DTCs, if there is a problem.
NOTE: This test takes less than 5 seconds.
While the test is running, the MasterDiagnostics®
screen displays message Diagnostics Running .
6. Record all DTCs on Diagnostic Form. See
“Diagnostic Trouble Codes” – Appendix C (page
643) for DTCs.
7. Correct problem causing active DTCs.
8. Clear DTCs.
Possible Causes
• Failed ele ctrica l components or circuitry
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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