Navistar International DT 466 Diagnostic/Troubleshooting Manual page 65

Standard Features
Electronic Governor Control
International® engines are electronically controlled for
all operating ranges.
American Trucking Association (ATA) Datalink
Vehicles are equipped with the ATA datalink connector
for communication between the Electronic Control
Module (ECM) and the Electronic Service Tool (EST).
The ATA datalink supports:
• Transmission of engine parameter data.
• Transmission and clearing of Diagnostic Trouble
Codes (DTCs).
• Diagnostics and troubleshooting.
• Programming performance parameter values.
• Programming engine and vehicle features.
• Programming calibrations and strategies in the
ECM and Injector Drive Module (IDM).
For additional information, see "ATA Datalink" in
Section 7 (page 309).
Service Diagnostics
The EST provides diagnostic information using
the ATA datalink. The recommended EST is
the EZ-Tech® with MasterDiagnostics® software
provided by International®.
Faults from sensors,
components, and engine systems are detected by
the ECM and sent to the EST as DTCs. Effective
engine diagnostics require and rely on DTCs.
Event Logging System
The event logging system records engine operation
above maximum rpm (overspeed), high coolant
temperature, low coolant level, or low oil pressure.
The readings for the odometer and hourmeter are
stored in the ECM memory at the time of an event
and can be retrieved using the EST.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
2 ENGINE AND VEHICLE FEATURES
actuators, electronic
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Electronic Speedometer and Tachometer
The engine control system calibrates vehicle speed up
to 157,157 pulses per mile. The new speed calibration
information must be programmed with an EST.
The tachometer signal is generated by the ECM
by computing signals for the Camshaft Position
(CMP) sensor and Crankshaft Position (CKP)
sensor. Calculations for each sensor are sent to
the instrument panel through the Drivetrain Datalink
(CAN 1) and to the EST through the ATA datalink.
Inlet Air Heater
The inlet air heater feature improves engine start-up
in cold weather. The ECM controls the intake air
heater and monitors the engine temperature. When
the engine is ready for cranking, the ECM sends a
message to shut off the WAIT TO START lamp.
For additional information, see "IAH System" in
Section 7 (page 444).
Fast Idle Advance
Fast idle advance increases engine idle speed
up to 750 rpm for faster warm-up to operating
temperature. This occurs by the ECM monitoring
the EOT sensor input and adjusting the fuel injector
operation accordingly.
Low idle speed is increased proportionally when the
engine oil temperature is between 15 °C (59 °F) at
700 rpm to below -10 °C (14 °F) at 750 rpm.
Cold Ambient Protection (CAP)
CAP protects the engine from damage caused by
prolonged idle at no load during cold weather. CAP
also improves cab warm-up.
CAP maintains engine coolant temperature by
increasing the engine rpm to a programmed value
when the ambient air temperature is at or below 0 °C
(32 °F) and the engine coolant temperature is below
65 °C (149 °F) while the engine has been idling with
no load for more than 5 minutes.
CAP is standard on trucks without an Idle Shutdown
Timer (IST).
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