2011 NISSAN ALTIMA HYBRID engine overheat

acceleration also consumes high voltage battery
power, resulting in poor acceleration. Battery
power can be restored by driving at a constant
speed.
When you put the shift selector in the B (Brake)
position and take your foot off the accelerator
pedal, engine braking will be applied. However,
during high speed driving you may feel that en-
gine braking is less effective than that of an
ordinary vehicle. This is normal.
Because the vehicle is powered by both the
gasoline engine and the traction motor, you may
hear a sound coming from the engine compart-
ment, high voltage battery, transmission or the
regenerative brakes. When the gasoline engine
starts and stops with the Hybrid System on, you
may feel a vibration. When accelerating rapidly,
the engine noise may rise. A noise may also be
heard while braking. These are normal character-
istics of the hybrid vehicle.An air vent is located on the rear parcel shelf
A
to cool the high voltage battery. If the vent is
covered, the battery will overheat resulting in
reduced output performance of the Hybrid Sys-
tem.
You may hear the noise of the cooling fan from the
air vent.CAUTION
Do not place objects over or into the air
vent. The high voltage battery may over-
heat and be damaged.
LHV0004LHV0006
HEV-10HEV Overview

CAUTION
If the high temperature warning light illu-
minates while the engine is running, it
may indicate the engine temperature is
extremely high. Stop the vehicle safely as
soon as possible. If the vehicle is over-
heated, continuing vehicle operation may
seriously damage the engine. See “If your
vehicle overheats” in the “In case of emer-
gency” section.
High-voltage battery warninglight
This light may appear during the following condi-
tions:
● The high voltage battery voltage drops due
to the shift selector being left in “N”.
– The Hybrid System will work properly if the shift selector is placed in “P” and the
light goes off.
● The high voltage battery is discharged.
– If this light comes on when the READY light is on, stop your vehicle and contact
your NISSAN dealer
Hybrid system warning light
The hybrid system warning light comes on when:
● The amount of fuel in the tank is getting low.
● There is a problem with the traction motor or
other Hybrid System components.
If the fuel gauge indicates the fuel level is low,
refill the fuel tank immediately. See “Fuel gauge”
earlier in this section. After the fuel tank is filled,
the ignition switch is placed in the ON position,
and the Hybrid System is in the READY mode,
the hybrid system warning light should be off.
If the fuel gauge indicates a sufficient fuel level, or
if the hybrid system warning light comes on after
refilling the tank, there may be a problem with the
traction motor or other Hybrid System compo-
nents. Stop your vehicle immediately and contact
your NISSAN dealer.
Low tire pressure warning light
Your vehicle is equipped with a Tire Pressure
Monitoring System (TPMS) that monitors the tire
pressure of all tires except the spare.
The low tire pressure warning light warns of low
tire pressure or indicates that the TPMS is not
functioning properly. After the ignition switch is placed in the ON
position, this light illuminates for about 1 second
and turns off.
Low tire pressure warning:
If the vehicle is being driven with low tire
pressure, the warning light will illuminate.
When the low tire pressure warning light
illuminates, you should stop and adjust the
tire pressure of all 4 tires to the recom-
mended COLD tire pressure shown on the
Tire and Loading Information label located
in the driver’s door opening. The low tire
pressure warning light does not automati-
cally turn off when the tire pressure is ad-
justed. After the tire is inflated to the rec-
ommended pressure, the vehicle must be
driven at speeds above 16 MPH (25 km/h)
to activate the TPMS and turn off the low
tire pressure warning light. Use a tire pres-
sure gauge to check the tire pressure.
For additional information, see “Tire Pressure
Monitoring System (TPMS)” in the “Starting and
driving” section and in the “In case of emergency”
section.
Instruments and controls2-13

c. You notice a change in the sound ofthe exhaust system.
d. You have had an accident involving damage to the exhaust system, un-
derbody, or rear of the vehicle.
THREE-WAY CATALYST
The three-way catalyst is an emission control
device installed in the exhaust system. Exhaust
gases in the three-way catalyst are burned at
high temperatures to help reduce pollutants.
WARNING
●The exhaust gas and the exhaust sys-
tem are very hot. Keep people, animals
or flammable materials away from the
exhaust system components.
● Do not stop or park the vehicle over
flammable materials such as dry grass,
waste paper or rags. They may ignite
and cause a fire.
CAUTION
● Do not use leaded gasoline. Deposits
from leaded gasoline will seriously re-
duce the three-way catalyst’s ability to
help reduce exhaust pollutants. ●
Keep your engine tuned up. Malfunc-
tions in the ignition, fuel injection, or
electrical systems can cause overrich
fuel flow into the three-way catalyst,
causing it to overheat. Do not keep driv-
ing if the engine misfires, or if notice-
able loss of performance or other un-
usual operating conditions are
detected. Have the vehicle inspected
promptly by a NISSAN dealer.
● Avoid driving with an extremely low fuel
level. Running out of fuel could cause
the engine to misfire, damaging the
three-way catalyst.
● Do not race the engine while warming it
up.
● Do not push or tow your vehicle to start
the engine.
TIRE PRESSURE MONITORING
SYSTEM (TPMS)
Each tire, including the spare (if provided) ,
should be checked monthly when cold and in-
flated to the inflation pressure recommended by
the vehicle manufacturer on the vehicle placard
or tire inflation pressure label, located in the
driver’s door opening. (If your vehicle has tires of a different size than the
size indicated on the vehicle placard or tire infla-
tion pressure label, you should determine the
proper tire inflation pressure for those tires.)
As an added safety feature, your vehicle has been
equipped with a Tire Pressure Monitoring System
(TPMS) that illuminates a low tire pressure telltale
when one or more of your tires is significantly
under-inflated. Accordingly, when the low tire
pressure telltale illuminates, you should stop and
check all 4 tires as soon as possible, and inflate
them to the proper pressure. Driving on a signifi-
cantly under-inflated tire causes the tire to over-
heat and can lead to tire failure. Under-inflation
also reduces fuel efficiency and tire tread life, and
may affect the vehicle’s handling and stopping
ability.
Please note that the TPMS is not a substitute for
proper tire maintenance, and it is the driver’s
responsibility to maintain correct tire pressure,
even if under-inflation has not reached the level to
trigger illumination of the TPMS low tire pressure
telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate when the
system is not operating properly. The TPMS mal-
function indicator is combined with the low tire
pressure telltale. When the system detects a
malfunction, the telltale will flash for approxi-
Starting and driving5-3

Hydraulic system
The brake system has separate hydraulic circuits.
If one circuit malfunctions, you will still have brak-
ing at other wheels.
However, the brake pedal will have to be de-
pressed harder and your stopping distance will
increase. The brake system warning light will also
come on.
Brake actuator
The brake actuator uses a pump to provide
power assisted braking.
The brake warning light comes on if the actuator
is not functioning properly. The brake pedal will
be hard to depress and stopping distance will
increase. Depress the brake pedal firmly to stop
the vehicle in a safe place and contact a NISSAN
dealer.
If the brake pedal is depressed repeatedly, the
brake warning light may turn on. However this is
normal if the light turns off after a few seconds.
Noise may be heard in the engine room under the
following conditions. This is a normal operating
characteristic and does not indicate a malfunc-
tion.● When you open a door.
● When the brake pedal is depressed firmly. ●
When the brake pedal is depressed repeat-
edly.
● When the Hybrid System is in the READY
mode.
● When the Hybrid System is turned off.
It may be hard to depress the brake pedal or the
pedal stroke may be short with the Hybrid System
OFF. This is not a malfunction.
Using the brakes
Avoid resting your foot on the brake pedal while
driving. This will overheat the brakes, wear out the
brake pads faster, and reduce gas mileage.
To help reduce brake wear and to prevent the
brakes from overheating, reduce speed and
downshift to a lower gear before going down a
slope or long grade. Overheated brakes may
reduce braking performance and could result in
loss of vehicle control.
When applying the brakes, you may hear a sound
coming from the braking system. This is normal.
WARNING
While driving on a slippery surface, be
careful when braking, accelerating or
downshifting. Abrupt braking or acceler-
ating could cause the wheels to skid and
result in an accident.
Wet brakes
When the vehicle is washed or driven through
water, the brakes may get wet. As a result, your
braking distance will be longer and the vehicle
may pull to one side during braking.
To dry the brakes, drive the vehicle at a safe
speed while lightly pressing the brake pedal to
heat up the brakes. Do this until the brakes return
to normal. Avoid driving the vehicle at high
speeds until the brakes function correctly.
Parking brake break-in
Break-in the parking brake shoes whenever the
stopping effect of the parking brake is weakened
or whenever the parking brake shoes and/or
drum/rotors are replaced, in order to assure the
best brake performance.
This procedure is described in the vehicle service
manual and can be performed by a NISSAN
dealer.
5-20Starting and driving

6 In case of emergency
Emergency engine shut off.........................6-2
Flat tire ...........................................6-2
Tire Pressure Monitoring System (TPMS) ..........6-2
Changing a flat tire .............................6-3
Hybrid system stops operating while driving ..........6-7
Vehicle does not start ..............................6-7
Confirm battery is discharged . ...................6-7 Emergency Start
...............................6-7
Jump starting .....................................6-8
Push starting ..................................... 6-10
If your vehicle overheats ........................... 6-10
Towing your vehicle ............................... 6-11
Towing recommended by NISSAN ..............6-12
Vehicle recovery (freeing a stuck vehicle) .........6-13

8. Hold down the brake pedal and press theSTART button. The vehicle instruments and
gauges will light up, and the green READY
light will come ON.
CAUTION
If the green READY light does not come
on, press the START button to turn the
Hybrid System OFF. Carefully disconnect
the negative cable then the positive cable.
Have vehicle taken to dealership for
repair.
9. After the green READY light in the meter display comes ON, carefully disconnect the
negative cable and then the positive cable.
10. Replace the vent caps (if so equipped) . Be sure to dispose of the cloth used to cover
the vent holes as it may be contaminated
with corrosive acid.
WARNING
Do not push start this vehicle. The three-
way catalyst may be damaged.
CAUTION
Hybrid models cannot be push-started or
tow-started. Attempting to do so may
cause electrical or transmission damage. If your vehicle is overheating (indicated by the
high temperature warning light) , or if you feel a
lack of engine power, detect abnormal noise, etc.
take the following steps.
WARNING
●
Do not continue to drive if your vehicle
overheats. Doing so could cause engine
damage or a vehicle fire.
● To avoid the danger of being scalded,
never remove the radiator cap while the
engine and/or inverter is still hot. When
the radiator cap is removed, pressur-
ized hot water will spurt out, possibly
causing serious injury.
● Do not open the hood if steam is com-
ing out.
1. Move the vehicle safely off the road, apply the parking brake and move the shift selector
to P (Park) .
Do not turn the Hybrid System off.
2. Turn off the air conditioner. Open all the windows, move the heater or air conditioner
temperature control to maximum hot and fan
control to high speed.
PUSH STARTING IF YOUR VEHICLE OVERHEATS
6-10In case of emergency

The engine cooling system is filled at the factory
with a pre-diluted mixture of 50% Genuine
NISSAN Engine Coolant (blue) and 50% water
to provide year-round anti-freeze and coolant
protection. The anti-freeze solution contains rust
and corrosion inhibitors. Additional engine cool-
ing system additives are not necessary.
WARNING
●Never remove the radiator or coolant
reservoir cap when the engine is hot.
Wait until the engine and radiator cool
down. Serious burns could be caused
by high pressure fluid escaping from
the radiator. See precautions in “If your
vehicle overheats” found in the “In case
of emergency” section of this manual.
● The radiator is equipped with a pres-
sure type radiator cap. To prevent en-
gine damage, use only a genuine
NISSAN radiator cap.
CAUTION
● When adding or replacing coolant, be
sure to use only Genuine NISSAN Long
Life Antifreeze/Coolant (blue) or
equivalent. Genuine NISSAN Long Life
Antifreeze/Coolant (blue) is pre-diluted
to provide antifreeze protection to -34°
F (-37° C) . If additional freeze protec-
tion is needed due to weather where
you operate your vehicle, add Genuine
NISSAN Long Life Antifreeze/Coolant
(blue) concentrate following the direc-
tions on the container. If an equivalent
coolant other than Genuine NISSAN
Long Life Antifreeze/Coolant (blue) is
used, follow the coolant manufacturer’s
instructions to maintain minimum anti-
freeze protection to -34° F (-37° C) . The
use of other types of coolant solutions
other than Genuine NISSAN Long Life
Antifreeze/Coolant (blue) or equivalent
may damage the engine cooling
system. ●
The life expectancy of the factory-fill
coolant is 105,000 miles (168,000 km) or
7 years. Mixing any other type of cool-
ant other than Genuine NISSAN Long
Life Antifreeze/Coolant (blue) , includ-
ing Genuine NISSAN Long Life
Antifreeze/Coolant (green) , or the use
of non-distilled water will reduce the
life expectancy of the factory-fill cool-
ant. Refer to the Nissan Service and
Maintenance Guide for more details.
ENGINE COOLING SYSTEM
8-8Maintenance and do-it-yourself

CHECKING ENGINE COOLANT
LEVEL
Check the coolant levelin the reservoir when
the engine and inverter are cold. If the cool-
ant level is below the MIN level
B, add coolant to
the MAX level
A. If the reservoir is empty, check
the coolant level in the radiator when the en-
gine is cold. If there is insufficient coolant in the
radiator, fill the radiator with coolant up to the filler
opening and also add it to the reservoir up to the
MAX level
A.
This vehicle contains Genuine NISSAN Long Life
Antifreeze/Coolant (blue) . The life expectancy of
the factory-fill coolant is 105,000 miles (168,000 km) or 7 years. Mixing any other type of coolant or
the use of non-distilled water will reduce the life
expectancy of the factory-fill coolant. Refer to the
NISSAN Service and Maintenance Guide for
more details.
If the cooling system frequently requires
coolant, have it checked by a NISSAN
dealer.
CHANGING ENGINE COOLANT
A NISSAN dealer can change the engine coolant.
The service procedure can be found in the
NISSAN Service Manual.
Improper servicing can result in reduced
heater performance and engine overheat-
ing.
WARNING
●
To avoid the danger of being scalded,
never change the coolant when the en-
gine is hot.
● Never remove the radiator cap when the
engine is hot. Serious burns could be
caused by high pressure fluid escaping
from the radiator. ●
Avoid direct skin contact with used
coolant. If skin contact is made, wash
thoroughly with soap or hand cleaner
as soon as possible.
● Keep coolant out of the reach of chil-
dren and pets.
Engine coolant must be disposed of properly.
Check your local regulations.
LDI0554
Maintenance and do-it-yourself8-9