2015 TOYOTA PRIUS PLUG-IN HYBRID engine

40 1-1. Plug-in hybrid system
PRIUS PHV_OM_OM47A11U_(U)
■Refilling fuel
Plug-in hybrid vehicles can be driven using electricity charged from an exter-
nal power source, however the gasoline engine that is provided on board as
a power source for driving in HV mode needs to be filled with fuel. Check the
fuel amount and refill immediately when the fuel level becomes low.
( P. 178)
■ Gasoline engine operation in EV mode
Even if there is a sufficient amount of electricity remaining in the hybrid bat-
tery (traction battery) and EV driving range ( P. 58, 273) is being displayed
on the multi-information display etc., the gasoline engine may operate auto-
matically in the following circumstances (EV driving will be returned to auto-
matically after EV driving becomes possible again):
● When the heater etc. is in use.
● When the temperature of the hybrid system is high.
The vehicle has been left in the sun, driven on a hill, driven at high
speeds, etc.
● When the temperature of the hybrid system is low.
● When power is needed temporarily, for example when accelerating sud-
denly.
● When vehicle speed is more than approximately 62 mph (100 km/h).
● When the accelerator pedal is depressed firmly, the vehicle is driven up a
hill, etc.
● When the outside temperature is low (less than about 14°F [-10°C])
The gasoline engine may also operate in circumstances other than those
listed above, depending on conditions.

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1-1. Plug-in hybrid system
1
Before driving
PRIUS PHV_OM_OM47A11U_(U)
■
When continually using EV mode only
After driving for approximately 124 miles (200 km) with the gasoline engine
off, the gasoline engine may start for a short amount of time in order to pro-
tect the system.
■ Conditions in which the gasoline engine may not stop
The gasoline engine starts and stops automatically. However, it may not stop
automatically in the following conditions
*:
● During gasoline engine warm-up
● When the temperature of the hybrid battery (traction battery) is high or
low
● During hybrid battery (traction battery) charging
● When the heater is switched on
*: Depending on the circumstances, the gasoline engine may also not stop
automatically in situations other than those above.
■ If the vehicle is not used for a long time
The 12-volt battery may discharge. In this event, charge the 12-volt battery.
(P. 601)
In order to prevent the hybrid battery (traction battery) from becoming
extremely low in charge, start the hybrid system at least once every 2 or 3
months, and turn the “POWER” switch off after the gasoline engine has
stopped automatically. (If the gasoline engine does not start up even after
approximately 10 seconds have passed since the “READY” indicator came
on, the “POWER” switch can be turned to OFF without any further action.)

42 1-1. Plug-in hybrid system
PRIUS PHV_OM_OM47A11U_(U)
■Sounds and vibrations specific to a hybrid vehicle
There may be no engine sounds or vibration even though the vehicle is able
to move. For safety, apply the parking brake and make sure to shift the shift
position to P when parked.
The following sounds or vibrations may occur when the hybrid system is
operating, and are not a malfunction.
●The brake system operation sound heard from the front of the vehicle
when the driver’s door is opened.
● Motor sounds may be heard from the engine compartment.
● Sounds may be heard from the hybrid battery (traction battery) behind
the rear seat when the hybrid system starts or stops.
● Sounds may be heard from the transmission when the gasoline engine
starts or stops, when driving at low speeds, or during idling.
● Engine sounds may be heard when accelerating sharply.
● Sounds may be heard due to regenerative braking when you press the
brake pedal or release the accelerator pedal.
● Vibration may be felt when the gasoline engine starts or stops.
● Cooling fan sounds may be heard from the air intake vent. ( P. 45)
● The operation sound of the air conditioning system (air conditioning com-
pressor, blower motor).

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1-1. Plug-in hybrid system
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Before driving
PRIUS PHV_OM_OM47A11U_(U)
NOTICE
■
Hybrid battery (traction battery) air vents
●Do not put foreign objects near the air vents. The hybrid battery (traction
battery) may overheat, leading to a reduction in hybrid battery (traction
battery) output or a malfunction.
● Clean the air vents regularly to prevent the hybrid battery (traction battery)
from overheating.
● Do not wet or allow foreign substances to enter the air vents as this may
cause a short circuit and damage the hybrid battery (traction battery).
● Do not carry large amounts of water such as water cooler bottles in the
vehicle. If water spills onto the hybrid battery (traction battery), the battery
may be damaged. Have the vehicle inspected by your Toyota dealer.
● If the rear seat belt becomes separated from the guide ( P. 154), it could
obstruct the hybrid battery (traction battery) air vent. Set the rear seat belt
into the guide to use.
■ Notice about fuel
For plug-in hybrid vehicles, fuel may remain in the tank for a long time and
undergo changes in quality depending on the how the vehicle is used.
Refuel at least 5.3 gal.(20 L, 4.4 Imp.gal.) of fuel every 6 months (refuel a
total of at least 5.3 gal. [20 L, 4.4 Imp.gal.] over a 6-month period), as this
may affect components of the fuel system or the gasoline engine.

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1-1. Plug-in hybrid system
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Before driving
PRIUS PHV_OM_OM47A11U_(U)
ConditionDisplay
When the vehicle is powered by
the electric motor (traction
motor)
When the vehicle is powered by
both the gasoline engine and the
electric motor (traction motor)
When the vehicle is powered by
the gasoline engine

56 1-1. Plug-in hybrid system
PRIUS PHV_OM_OM47A11U_(U)
ConditionDisplay
When the vehicle is powered by
the electric motor (traction
motor)
When the vehicle is powered by
both the gasoline engine and the
electric motor (traction motor)
When the vehicle is powered by
the gasoline engine

58 1-1. Plug-in hybrid system
PRIUS PHV_OM_OM47A11U_(U)
Multi-information displayPress the “DISP” button to dis-
play the energy monitor.
■ Names and meaning of each icons
Gasoline engine
Hybrid battery (traction bat-
tery)
Electric motor (traction motor)
EV driving range
Displays the approximate driving
range using only the electric
motor (traction motor) when in EV
mode or when enough power is
remaining for EV mode. The dis-
play turns off if the charge level of
the hybrid battery (traction bat-
tery) reduces and HV mode is
selected.
(The display will not turn off if HV
mode is selected using the EV/
HV mode selection switch.)

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1-1. Plug-in hybrid system
1
Before driving
PRIUS PHV_OM_OM47A11U_(U)
ConditionDisplay
When the vehicle is powered by
the electric motor (traction
motor) The illustration shows the display when
in EV mode.
When the vehicle is powered by
both the gasoline engine and the
electric motor (traction motor)
When the vehicle is powered by
the gasoline engine
When charging the hybrid bat-
tery (traction battery) from an
external power source (while a
charging cable is connected)