engine overheat TOYOTA PRIUS V 2018 Owners Manual

17Pictorial index
PRIUS v_OM_OM47B78U_(U)Windshield wipers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 192
Precautions against winter season . . . . . . . . . . . . . . . . . . . . . P. 262
Fuel filler door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 195
Refueling method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 195
Fuel type/fuel tank capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 538
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 431
Tire size/inflation pressure . . . . . . . . . . . . . . . . . . . . . . . . . P. 543
Winter tires/tire chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 262
Checking/rotation/tire pressure warning system . . . . . . . . . P. 431
Coping with flat tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 506
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . P. 409
Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 409
Engine compartment cover . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 414
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 539
Coping with overheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 528
Headlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 182
Parking lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 182
Daytime running lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 182
Side marker lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 182
Fog lights
* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 191
Turn signal lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 180
Tail lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 182
License plate lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 182
Back-up lights
Shifting the shift lever to R . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 175
4
5
6
7
Light bulbs of the exterior lights for driving
(Replacing method: P. 454, Watts: P. 544)
*: If equipped
8
9
10
11
12
13
14
15
16

PRIUS v_OM_OM47B78U_(U)
932. Instrument cluster
2
Instrument cluster
■The meters and display illuminate when
The power switch is in ON mode.
■ Remaining hybrid battery (tract ion battery) charge display
The charge amount of the hybrid battery (traction battery) is automatically
controlled by the hybrid system. For this reason, even if electricity is recov-
ered via the regenerative braking, or electricity is generated via the gasoline
engine, the displayed hybrid battery (traction battery) charge amount may not
reach the highest level (level 8). However, this does not indicate a malfunc-
tion.
■ Engine speed
On hybrid vehicles, engine speed is precisely controlled in order to help
improve fuel efficiency and reduce exhaust emissions etc.
■ Brightness of the instrument panel light
If the headlight switch is turned to ON while the surrounding area is dark, the
instrument panel lights will dim.
■ When disconnecting and reconnect ing 12-volt battery terminals
The fuel consumption display and average vehicle speed will be reset.
NOTICE
■ To prevent damage to the engine and its components
The engine may be overheating if the high coolant temperature warning
light comes on or flashes. In this case, immediately stop the vehicle in a
safe place, and check the engine after it has cooled completely. ( P. 528)
■ The information display at low temperatures
Allow the interior of the vehicle to warm up before using the liquid crystal
information display. At extremely low temperatures, the information display
monitor may respond slowly, and display changes may be delayed.

154
PRIUS v_OM_OM47B78U_(U)
4-1. Before driving
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■When driving the vehicle
●During normal driving, do not turn off the hybrid system. Turning the hybrid
system off while driving will not cause loss of steering or braking control,
however, power assist to the steering will be lost. This will make it more
difficult to steer smoothly, so you should pull over and stop the vehicle as
soon as it is safe to do so.
In the event of an emergency, such as if it becomes impossible to stop the
vehicle in the normal way: P. 471
● Use engine braking (shift position B instead of shift position D) to maintain
a safe speed when driving down a steep hill.
Using the brakes continuously may cause the brakes to overheat and lose
effectiveness. ( P. 176)
● Do not adjust the positions of the steering wheel, the seat, or the inside or
outside rear view mirrors while driving.
Doing so may result in a loss of vehicle control.
● Always check that all passengers’ ar ms, heads or other parts of their body
are not outside the vehicle.
● Do not drive in excess of the speed limit. Even if the legal speed limit per-
mits it, do not drive over 85 mph (140 km/h) unless your vehicle has high-
speed capability tires. Driving over 85 mph (140 km/h) may result in tire
failure, loss of control and possible injury. Be sure to consult a tire dealer
to determine whether the tires on y our vehicle are high-speed capability
tires or not before driving at such speeds.
■ When driving on slippery road surfaces
●Sudden braking, acceleration and steering may cause tire slippage and
reduce your ability to control the vehicle.
● Sudden acceleration, engine braking due to shifting, or changes in engine
speed could cause the vehicle to skid, resulting in an accident.
● After driving through a puddle, depress the brake pedal to make sure that
the brakes are functioning properly . Wet brake pads may prevent the
brakes from functioning properly. If the brakes on only one side are wet
and not functioning properly, steering control may be affected.

156
PRIUS v_OM_OM47B78U_(U)
4-1. Before driving
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■When the vehicle is stopped
●Do not depress the accelerator pedal unnecessarily.
If the shift position is in any position other than P or N, the vehicle may
accelerate suddenly and unexpectedly, causing an accident.
● In order to prevent accidents due to the vehicle rolling away, always keep
depressing the brake pedal while stopped with the “READY” indicator is
illuminated, and apply the parking brake as necessary.
● If the vehicle is stopped on an incline, in order to prevent accidents caused
by the vehicle rolling forward or backward, always depress the brake pedal
and securely apply the parking brake as needed.
● Avoid revving or racing the engine.
Running the engine at high speed while the vehicle is stopped may cause
the exhaust system to overheat, which could result in a fire if combustible
material is nearby.

4928-2. Steps to take in an emergency
PRIUS v_OM_OM47B78U_(U)
Indicates an engine oil pressure malfunction A buzzer also sounds.
 Immediately stop the vehicle in a safe place
and contact your Toyota dealer.
Indicates a malfunction in the Drive-Start Control
system
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates a malfunction in the brake override sys-
tem
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates that the hybrid system has overheated
This message may be displayed when driving
under severe operating conditions, and the out-
put of the hybrid system may temporarily
decrease in order to protect the system. (For
example, when driving up a long steep hill or
driving up a steep hill in reverse.)
A buzzer also sounds.
 Stop and check. ( P. 528)
Indicates a malfunction in the Automatic High
Beam
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
Indicates that the accelerator and brake pedals
are being depressed simultaneously, and the
brake override system is operating.
Release the accelerator pedal and depress
the brake pedal. ( P. 151)
Warning messageDetails/Actions

5318-2. Steps to take in an emergency
PRIUS v_OM_OM47B78U_(U)
8
When trouble arises
After stopping the hybrid system and waiting for 5 minutes or
more, start the hybrid system and check for the instrument clus-
ter or multi-information display.
If the hybrid system overheat warning light does not turn off or
the message does not disappear:
Stop the hybrid system and contact your Toyota dealer.
If the hybrid system overheat warning light does not come on or
the message is not displayed:
The hybrid system temperature has dropped and the vehicle may
be driven normally.
However, if the warning light comes on again frequently or the message
appears again frequently, contact your Toyota dealer.
WARNING
■When inspecting under the hood of your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
●If steam is seen coming from under the hood, do not open the hood until
the steam has subsided. The engine compartment may be very hot.
● After the hybrid system has been turned off, check that the indicator on the
power switch and the “READY” indicator are off.
When the hybrid system is operating, the gasoline engine may automati-
cally start, or the cooling fan may suddenly operate even if the gasoline
engine stops. Do not touch or approach rotating parts such as the fan,
which may lead to fingers or clothing (especially a tie, a scarf or a muffler)
getting caught, resulting in serious injury.
● Do not loosen the coolant reservoir cap while the hybrid system and radia-
tor are hot.
High temperature steam or coolant could spray out.
6

591Alphabetical index
PRIUS v_OM_OM47B78U_(U)
If you have a flat tire ............. 506
If you lose your keys ............. 113
If you think something is wrong .............................. 477
If your vehicle becomes
stuck ................................... 533
If your vehicle has to be stopped in an
emergency.......................... 471
If your vehicle needs to be towed .................................. 472
If your vehicle overheats ....... 528
Energy monitor .................. 96, 103
Engine Accessory mode ................... 169
Compartment ........................ 413
Engine switch........................ 168
Exhaust gas precautions ........ 73
Hood ..................................... 409
How to start the hybrid system ................................ 168
Identification number ............ 538
If the hybrid system will not start .............................. 519
If your vehicle has to be stopped in an
emergency.......................... 471
Ignition switch (power switch) .................... 168
Overheating .......................... 528
Power switch......................... 168 Engine coolant
Capacity................................ 541
Checking............................... 419
Preparing and checking before winter ...................... 262
Engine coolant temperature warning light.......................... 480
Engine oil Capacity................................ 539
Checking............................... 415
Preparing and checking before winter ...................... 262
Engine switch .......................... 168 Auto power off function ......... 170
Changing the power switch modes ..................... 169
If your vehicle has to be
stopped in an
emergency ......................... 471
Starting the hybrid system .... 168
Engine switch light (power switch light) .............. 368
EPS
(Electronic Power Steering)Function ................................ 252
Warning light......................... 479
EV indicator ............................... 99
EV drive mode ......................... 173
Event data recorder (EDR)........ 11
Exhaust gas precautions .......... 73

593Alphabetical index
PRIUS v_OM_OM47B78U_(U)
High mounted stoplightReplacing .............................. 466
Hill-start assist control............ 253
Hood ......................................... 409
Hooks Cargo hooks ......................... 376
Retaining hooks (floor mat)..... 28
Horn .......................................... 140
Hybrid battery (traction battery)Location .................................. 78
Specification ......................... 539
Hybrid battery (traction battery)
air intake vent .......................... 79
Hybrid system ............................ 74 Brake Override System......... 151
Drive-Start Control ................ 151
Emergency shut off system .... 79
Energy
monitor/consumption
screen........................... 96, 103
EV drive mode ...................... 173
High voltage components ....... 78
Hybrid System Indicator........ 101
Hybrid system precautions ..... 78
Hybrid vehicle driving tips ..... 259
If the hybrid system will
not start .............................. 519
Overheating .......................... 528
Power switch......................... 168
Regenerative braking.............. 76
Starting the hybrid system .... 168
Vehicle proximity
notification system ................ 75
Hybrid System Indicator ......... 101
Hybrid transmission ................ 175 I/M test ...................................... 406
Identification
Engine .................................. 538
Vehicle .................................. 537
Ignition switch (Power switch)....................... 168Auto power off function ......... 170
Changing the power switch modes ..................... 169
If your vehicle has to be stopped in an
emergency ......................... 471
Starting the hybrid system .... 168
Ignition switch light
(power switch light) .............. 368
Illuminated entry system ........ 370
Immobilizer system ................... 83
Indicators ................................... 86
Initialization Item to initialize ..................... 567
Tire pressure warning
system ................................ 433
Inside rear view mirror ............ 142
Instrument panel light control ...................................... 92
Interior lights ........................... 368 Switch ........................... 369, 370
Wattage ................................ 544I

595Alphabetical index
PRIUS v_OM_OM47B78U_(U)
MaintenanceDo-it-yourself maintenance ... 407
General maintenance ........... 403
Maintenance data ................. 536
Maintenance requirements ... 401
Malfunction indicator lamp ..... 478
Meter Indicators ................................ 86
Instrument panel light
control................................... 92
Meters ..................................... 90
Multi-information display ......... 94
Warning lights ....................... 478
Warning messages ............... 487
Micro dust and pollen filter..... 362
Microphone .............................. 320
Mirrors Inside rear view mirror .......... 142
Outside rear view mirror defoggers ........................... 362
Outside rear view mirrors...... 144
Vanity mirrors........................ 380
MP3 disc ................................... 289
Multi-information display Drive information..................... 96
Dynamic radar cruise control................................. 227
Energy monitor ....................... 96
Language .............................. 559
LDA (Lane Departure Alert)................................... 217
Warning messages ............... 487 Navigation system*
Noise from under vehicle ........... 8
Odometer ................................... 91
Oil
Engine oil .............................. 539
Opener Fuel filler door ....................... 196
Hood ..................................... 409
Outside rear view mirrors ....... 144
Adjustment............................ 144
Folding .................................. 144
Outside rear view mirror defoggers ........................... 362
Outside temperature display.................................... 365
Overhead console ................... 375
Overheating ............................. 528
Overheating, Engine ............... 528
MN
O
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.