212 6 PERFORMANCE DIAGNOSTICS
1. Record all DTCs from DTC window on Diagnostic
Form. See “Diagnostic Trouble Codes” –
Appendix C (page 643) for DTCs.
2. Correct problem causing active DTCs before
continuing.
3. Clear DTCs.
4. Use EST to check KOEO values for temperat ure
and pressure sensors. Record results on
Diagnostic Form.
• If engine has not been run for 8 to 12 hours,
the Engine Coolant Temperature (ECT),
Engine Oil Temperature (EOT), and Manifold
Air Temperature (MAT) should be within
2 °C (5 °F) of each other. Th e Intake Air
Temperature (IAT) could be a few degrees
higher or lower due to faster outside engine
temperature change.
• The Injection Control Pressure (ICP) and
Brake Control Pressure (BCP) values may
fluctuate as much as 345 kPa (50 psi).
Electromagnetic Interference (EMI) or ground
shift can cause an insignificant voltage shift
that does not indicate a problem.
• Engine Oil Pressure (EOP), Manifold Air
Pressure (MAP), and Exhaust Back Pressure
(EBP) values may fluctuate as much as 7 kPa
(1 psi). Electromagnetic Interference (EMI)
or ground shift can cause an insignificant
voltage shift that does not indicate a problem.
• Barometric Absolute Pressure (BAP) values
should equal the barometric reading for your
region.
• Are values normal?
• If abnormal values are s uspected, record o n
Diagnostic Form and see Operational Voltage
tables in Section 7 (page 283) for applicable
sensor.
5. Continue with KOEO Standard Test.
Reading DTCs
ATA code: Codes associated with a Subsystem
Identifier (SID), Parameter Identifier (PID), and
Failure Mode Indicator (FMI)
DTC: Diagnostic Trouble Code
Status: Indicates active or inactive DTCs
• Active: With the ignition switch on, active
indicates a DTC for a condition currently in the
system. When the ignition switch is t urned off,
an active DTC becomes inactive. (If a problem
remains, the DTC will be active on the next
ignition switch cy cle and the EST will displa y
active/inac tive.)
• Inactive: With the ignition switch on, inactive
indicates a DTC for a condition during a previous
key cycle. Whe n the ignition switch is turned
to OFF, inactive DT Cs from a previous ig n ition
switch cycle, remain in the ECM memory until
cleared.
• Active/Inactive: With the ignition switch on,
active/inactive indicates a DTC for a condition
currently in the system and was present in
previous key cycles, if the codes were not cleared.
Description:Defi nes each DTC
Possible Caus es
• Electronics failure
• Failure of the ICP sensor or ICP system
• Failure of the Air Management System (AMS)
• Failure of Diamond Logic® engine brake
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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