2012 Lexus LFA coolant temperature

17
Engine protection mechanisms
■
■Limited maximum engine speed during break-in
period
The maximum engine speed is limited to 7,400 rpm if the total mileage shown on the
odometer is less than 310 miles (500 km).
■
■Engine starting restrictions in extremely low
temperatures
In extremely low temperatures, such as when the coolant or oil temperature gauge
shows a reading of -13°F (-25°C) or below, the engine will not be allowed to start.
This mechanism is designed to protect the engine.
■
■Restricted maximum engine speed in extremely
low temperatures
When the engine is started with the coolant temperature gauge showing a reading
of 5°F (-15°C) or below, the maximum engine speed will be limited to 4,400 rpm for
approximately eight minutes.
■
■Variable maximum engine speed during warm-
up
When the engine is started with the coolant temperature gauge showing a reading
of 176°F (80°C) or below, the maximum engine speed will vary according to the
coolant temperature.
■
■Limited maximum engine speed in neutral gear
The maximum engine speed will be limited to 5,100 rpm when neutral gear is selected
and the accelerator pedal is continuously depressed.

57
Checking the engine
■
■Meter layout
The speedometer and tachometer are located in the center of the meter, serving
as the primary interface between the vehicle and the driver. The engine coolant
temperature and the engine oil temperature gauges are located at the top of
each corner, while the engine oil pressure gauge is located below the engine oil
temperature gauge. This minimizes eye motion, allowing the driver to understand the
vehicle’s condition at a glance.
1
2
3
65
4
7
1 Speedometer
2 Tachometer
3 Engine coolant temperature gauge
4 Engine oil temperature gauge
5 Engine oil pressure gauge
6 Fuel gauge
7 Oil level display (s electable fr om th e
menu display)

59
Checking the engine
■
■Tachometer
A TFT LCD panel allows for the tachometer needle to be ultra-responsive while
retaining an analog look. This allows the driver to witness the amazing response of the
engine visually while also being treated to its exhilarating acoustics.
To protect the engine when the coolant temperature is low, the tachometer red zone
display changes from between 4,400 to 9,000 rpm.
The maximum engine speed is displayed.
One of three colors can be chosen
for the tachometer needle.
■
■Digitalization with the looks of an analog tachometer
When idling, the tachometer display is not digitally
processed in order to express the raw, characteristic
fluctuations of a traditional analog needle.
When the needle needs to keep up with fast response,
the tachometer display is digitally processed to create
smooth needle movement with an afterimage of the needle.

60
■
■Engine coolant temperature gauge
The engine coolant temperature gauge displays the coolant temperature between
100 and 265°F (40 and 130°C). When the coolant temperature exceeds 244°F
(118°C), a buzzer will sound and the bar display will blink in red and white to inform
the driver of abnormally high coolant temperatures.
During high-speed driving: approximately 176
to 194°F (80 to 90°C)
Idling: approximately 203°F (95°C)
[Outside air temperature approximately 68°F
(20°C)]Blinks when temperature exceeds
244°F (118°C)
Each bank of cylinders has its own engine coolant temperature sensor. The ECU
calculates the engine coolant temperature from both of these sensors and informs the
driver using the engine coolant temperature gauge.

115
Index
Checking the oil level 69
Clock 67
Clutch 37
Clutch disc 37
Cold starting restrictions 17
Combination meter 57
Connecting an external battery
to start the engine 98
Control characteristics
depending on driving mode 23
Control pad 66
Coolant temperature 60
Coolant temperature gauge 60
Crankshaft 38
Creep phenomenon 37
DDark current (parasitic current) 93
Dead battery 94
Default shift speed setting 41
Departure angle 100
Diaphragm spring 37
Differential 39
Differential oil cooler 39
Digital display 56
Disabling the theft deterrent
system 102
Disabling the tilt sensor 102
Discharged battery 94
Disconnecting the negative (-)
battery terminal 99
Door mirror switches 9
Double wishbone front
suspension 47
Downshift 40
Driving mode 58
Driving mode selection 27
Driving mode selector switch 41
Driving mode selector switch
operation 23
Driving mode-linked variable
throttle response 33
Driving position 20
Driving position adjustment 10
Dry single-plate clutch 37
Dual shaft transmission 39
EECB (Electronically
Controlled Brake) 50
Emergency brake 9
Engine 56
Engine code 16
Engine coolant 60
Engine coolant temperature
gauge 60
Engine coolant temperature
sensor 60
Engine limiters 16
Engine oil pressure 62
Engine oil pressure gauge 62
Engine oil temperature gauge 61
Engine overspeed 70
Engine protection mechanisms 16