Navistar International DT 466 Diagnostic/Troubleshooting Manual page 447

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
• DTC 316 can be set due to any of the following
conditions:
• Extended idle time
• Cold ambient temperatures (may require use
of winter front)
• Thermostat stuck in open position
• Incorrectly plumbed
(thermostat bypassed)
• Auxiliary heater cores cooling off engine
(school bus application)
• Fan clutch locked on
DTC 313
EOP below warning level
• DTC 313 is set by the ECM when the oil pressure
has dropped below the warning level.
specification for the warning level is:
• 34 kPa (5 psi) @ 700 rpm
• 69 kPa (10 psi) @ 1400 rpm
• 138 kPa (20 psi) @ 2000 rpm
The ECM illuminates the red ENGINE
lamp and sounds
For diagnostics, see "Engine Symptoms
Diagnostics" – Section 4 (page 101).
• DTC 313 can be set due to a failed EOP sensor
sending an incorrect signal.
compare actual oil pressure to the reading on
the data list of the EST. Low oil pressure due to
inoperative mechanical components will also set
DTC 313.
DTC 314
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
cooling system
The
an audible alarm.
To confirm this,
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
EOP below critical level
• DTC 314 is set by the ECM when the oil
pressure has dropped below the critical level.
The specification for the critical level is:
• 14 kPa (2 psi) @ 700 rpm
• 83 kPa (12 psi) @ 1400 rpm
• 152 kPa (22 psi) @ 2000 rpm
The ECM flashes the red ENGINE lamp
and sounds an audible alarm. See "Engine
Symptoms Diagnostics" – Section 4 (page
101).
• DTC 314 can be set due to a failed EOP sensor
sending an incorrect signal.
compare actual oil pressure to the reading on
the data list of the EST. Low oil pressure due to
inoperative mechanical components will also set
DTC 313.
DTC 315
Engine speed above warning level
• DTC 315 is set by the ECM when the engine rpm
has exceeded 3400 rpm.
• DTC 315 can be set due to any of the following
conditions:
• Excessive engine speed in an unintended
downshift.
• Steep acceleration downhill without correct
brake application.
• External fuel source being ingested into air
intake system.
• When DTC 315 is active the amber ENGINE lamp
is illuminated. The engine hours and miles of the
last two over speed occurrences will be recorded
in the engine event log.
443
To confirm this,