2008 LEXUS RX400H fuel pump

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1-1. Hybrid system
RX400h_U■
Hybrid battery air vent
There is an air intake vent under
the rear seats to cooling the hybrid
battery (traction battery). If the
vent becomes blocked, the hybrid
battery may overheat, leading to a
reduction in hybrid battery output.
Emergency shut off system
The emergency shut off system blocks off the high voltage current and
stops the fuel pump to minimize the r isk of electrocution and fuel leakage
when a certain level of impact is detected by the impact sensor. If the
emergency shut off system activates, your vehicle will not restart. To
restart the hybrid system, contact your Lexus dealer.
Energy monitor/consumption screen
You can view the status of your hybr id system on the multi-information
display ( →P. 143) and the navigation system screen. The following
images are examples only, and may vary slightly from actual conditions.
■ Energy monitor
● How to display on the navigation system screen:
Press INFO.
Touch on the Information screen.
If the Consumption screen is displayed, touch .
● How to display on the multi-information display:
Push the button several times to select the energy moni-
tor display.
STEP1
STEP2
STEP1

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1-1. Hybrid system
1
Before driving
RX400h_U
■If a warning light comes on or a warning message is displayed, or the 12-volt bat-
tery is disconnected
The hybrid system may not start. In that case, try to start the system again. If the
READY light does not come on, contact your Lexus dealer.
■Emergency shut off system
The emergency shut off system blocks off the high voltage current and stops the
fuel pump to minimize the risk of the electric leakage and the fuel leakage when a
certain level of impact is detected by the impact sensor. If the system activates, your
vehicle will not restart. To restart the hybrid system, contact a Lexus dealer.
CAUTION
■High voltage precautions
The vehicle has high voltage DC and AC systems as well as a system. DC and AC
high voltage is very dangerous and can cause severe burns and electric shock that
may result in death or serious injury.
●Never touch, disassemble, remove or replace the high voltage parts, cables and
their connectors.
●The hybrid system will become hot after starting as the system uses high voltage.
Be careful of both the high voltage and the high temperature, and always obey
the caution labels attached to the vehicle.
●Never try to open the service plug access hole located in the luggage compart-
ment. The service plug is used only when the vehicle is serviced and is subject to
high voltage.

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4-3. Do-it-yourself maintenance
RX400h_U■
Engine compartment (type C)
41IGCT NO.510Hybrid system
FuseAmpereCircuit
42WAT E R P U M P10Air conditioning system
43SEAT HTR20Seat heaters
44IGCT NO.2 10Hybrid system
45IGCT NO.310Hybrid system, fuel pump
46IGCT NO.410Emission control system, transaxle
control system, air/fuel control system
FuseAmpereCircuit

442
6-1. Specifications
RX400h_U
Fuel information
■Fuel tank opening for unleaded gasoline
To help prevent incorrect fueling, your Lexus has a fuel tank opening that only
accommodates the special nozzle on unleaded fuel pumps.
■If premium gasoline is not available
If 91 rating gasoline cannot be obtained, you may use unleaded gasoline with an
octane rating as low as 87 (Research Octane Rating 91).
■If your engine knocks
●Consult your Lexus dealer.
●You may occasionally notice light knocking for a short time while accelerating or
driving uphill. This is normal and there is no need for concern.
■Gasoline quality
In very few cases, driveability problems may be caused by the brand of gasoline you
are using. If driveability problems persist, try changing the brand of gasoline. If this
does not correct the problem, consult your Lexus dealer.
Your vehicle must use only unleaded gasoline.
Premium unleaded gasoline with an octane rating of 91 (Research Octane
Number 96) or higher required for optimum engine performance.
At minimum, the gasoline you use should meet the specifications of
ASTM D4814 in the U.S.A. and CGSB3.5-M93 in Canada.