PREVOST X3-45 2017, Operator'S Manual, Page: 80 / 227

Controls and Instruments
PA1627 X3-45 Operator’s Manual
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06740_C
Low DEF level
Illuminates when there is less than 2.6 gallons (10 liters) of DEF left in the tank.
CAUTION
This telltale light starts flashing when there is only 2.5 liters (0.6 gallons) left in the
tank.
If the vehicle is kept in operation with an empty DEF tank, and engine derate will
eventually occur, limiting the speed to 5 mph.
06740_D
20B
CHARGING SYSTEM WARNING LIGHT
Indicates a malfunction of the charging system or a low battery voltage condition.
19T
NOTE
To identify if an alternator is defective (1=lower alternator, 2=upper alternator),
perform a system diagnostic using the Driver Information Display DIAGNOSTICS
menu. Select VIEW ACTIVE FAULTS and then ELECTRICAL SYSTEM. Scroll
through the active faults. The electrical system active faults will appear. A diagnostic
message indicating “alternator 1” or “alternator 2” with failure mode “open circuit” will
come in sight.
06740_E
21B
Intake air preheater on – wait before starting
Illuminates when the intake air preheater element is in function. Wait until this telltale
light has turned off before starting the engine. For more information on this feature, refer
to paragraph “Cold Weather Starting” in Starting And Stopping Procedures chapter.
06740_F
22B
Flat tire (with optional tire pressure monitoring system)
Illuminates when a tire pressure is 25% below the target tire pressure.
06740_G
23B
Hill start assist
Indicates a malfunction of the hill start assist function. This function might not be
available.