Hd-Obd Overview - Navistar MaxxForce 7 Operation And Maintenance Manual

Operation (cont.)
ENGINE WARNING PROTECTION SYSTEM (EWPS) (cont.)
• EOT - Engine Oil Temperature overheat warning
• EOP - Low Engine Oil Pressure warning
• EFT - Engine Fuel Temperature overheat warning
• ECL - Low Engine Coolant Level warning
NOTE: The protection mode is not offered for school buses or
emergency vehicles.
Protection Mode (optional)
• The protection mode is an optional calibration that can be
added to the EWPS by an authorized service provider.
Engine shutdown is available if critical condition is detected:
• ECT - Engine Coolant Temperature overheat protection
• EOT - Engine Oil Temperature overheat protection
• EOP - Low Engine Oil Pressure protection
• EFT - Engine Fuel Temperature overheat protection
• ECL - Low Engine Coolant Level protection
Warning - Temperature above specific threshold will sound a
buzzer, illuminate the Amber Warning Lamp, set a DTC, and
de-rate the engine.
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SECTION 4 – ENGINE OPERATION
Critical - Temperature above specific threshold will shut down
the engine and set a DTC. The operator has 30 seconds to
safely pull vehicle off the road before the engine shuts off.
A Red Stop Lamp will illuminate before engine shutdown is
approaching. The ECM allows the engine to be restarted and
run for 30–second periods.
Event Log - This feature logs occurrences of the event according
to engine hours and odometer readings, for both Standard
warning and optional Protection modes.

HD-OBD OVERVIEW

The HD-OBD system uses many individual pre-programmed
"monitors" to ensure the vehicle is meeting emissions standards.
An HD-OBD monitor is a strategy to evaluate the performance
of an emissions related system or component. All monitors
are designed for execution in a prescribed frequency; some
monitors run continuously, while some run a specific ratio
against the number of drive cycles.
The operator will be alerted to emissions or other system
problems when the Malfunction Indicator Lamp (MIL) illuminates.
When the MIL illuminates, bring the vehicle in for service at
the next available opportunity. The HD-OBD system does not
change the way the vehicle should be driven, the recommended
driving style, or the way you use the vehicle.