Cold Weather Operation - Navistar MaxxForce 7 Operation And Maintenance Manual

Operation (cont.)
ENGINE IDLE SHUTDOWN TIMER (CALIFORNIA AND ALL
STATE - OPTIONAL [2012 AND NEWER VEHICLES]) (cont.)
idle time can be programmed up to 60 minutes. The ECM will
deactivate the IST when the PTO is active.
Thirty seconds before engine shutdown, the IDLE SHUTDOWN
indicator in the instrument panel gauge cluster illuminates. This
continues until the engine shuts down or the low idle shutdown
timer is reset. The engine must be out of gear for the IST to
work. Engine shutdown timer will deactivate for one or more of
the following conditions:
• Engine speed is not at idle speed (700 rpm).
• Vehicle movement or a Vehicle Speed Sensor (VSS) fault is
detected.
• Manual DPF regeneration is enabled (Parked Regen).
• Accelerator pedal movement or an Accelerator Pedal
Sensor (APS) fault is detected.
• Engine coolant operating temperature is below 60°F (16°C).
• Brake pedal movement or a brake switch fault is detected.
• Parking brake transition is detected.
• Clutch pedal is pressed or clutch pedal switch fault is
detected (manual transmissions, if equipped with a clutch
switch).
SECTION 4 – ENGINE OPERATION
•
•

COLD WEATHER OPERATION

NOTE: If operating in temperatures below -20°F (-29°C), contact
an authorized service provider for information about special cold
weather equipment and precautions.
NOTE: At temperatures below 10°F (-12°C), a crankcase
mounted cup plug coolant heater is recommended to improve
cold starting.
1. Before operating the engine at 32°F (0°C) or lower, check or
Shift selector is moved
transmissions).
If the IST is enabled, the Cold Ambient Protection (CAP) will
not function.
service the following:
• Correct battery size
• Correct amount of electrolyte, if not a maintenance free
battery
• Full battery charge
• Condition of other electrical equipment
• Cooling system hoses for leaks
from neutral (automatic
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