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68
Continuous Monitor
Continuous Monitor is a series of continuous
diagnostic tests done by the Electronic Control
Module (ECM) to detect failure modes (Out of Range,
In Range, and System Faults). During Continuous
Monitor the ignition switch is on.
•
Out of Range High (Voltage over normal
operating range)
•
Out of Range Low (Voltage under normal
operating range)
•
In Range (In normal operating range but not
correct for conditions)
•
System Malfunction (System is not operating
according to conditions)
If an input signal is out of range (over or under normal
operating range), the ECM logs a fault and sets a
Diagnostic Trouble Code (DTC). The ECM monitors
the operation of systems for in range conditions
to determine if systems are working in a normal
operational range; If the ECM detects that a system
falls outside a predetermined range, it will log a fault
and set a DTC.
Each DTC has a three digit number to identify the
source of a malfunction measured or monitored
electronically. A fault is a malfunction measured or
monitored electronically.
The ECM continuously monitors the Injection Control
Pressure (ICP) system and the Air Management
System (AMS). If the ECM detects that a system falls
outside a predetermined range, the ECM logs a fault
and sets a DTC.
During
normal
engine
automatically performs several tests to detect faults.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
3 DIAGNOSTIC SOFTWARE OPERATION
operation,
the
ECM
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
When a fault is detected, the ECM often runs a fault
management strategy to allow continued, though
sometimes degraded, vehicle operation.
With the engine running,
permanently recorded in the ECM; engine events
can be retrieved with the Electronic Service Tool
(EST).
Engine Events
Standard Engine Events
Standard engine events include excessive coolant
temperature and engine rpm (over-speed).
Optional Engine Events
Optional engine events are monitored and recorded,
if the engine is equipped with the optional Engine
Warning Protection System (EWPS). Optional engine
events recorded by the ECM include low coolant level
and low oil pressure.
Engine Event Hours/Odometer
The ECM records engine events in two ways, hours
and odometer readings.
Examples
•
Overheat Hour 1
•
Overheat Hour 2
•
Overheat Odometer 1
•
Overheat Odometer 2
The ECM stores the two most recent events. Two
events could happen in the same hour, and two events
could happen in the same mile.
engine events are
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