2020 Lexus GX460 check engine

5447-2. Steps to take in an emergency
GX460_OM_OM60R27U_(U)
Start the engine of the second vehicle. Increase the engine speed slightly and
maintain at that level for approximatel y 5 minutes to recharge the battery of
your vehicle.
Open and close any of the doors of your vehicle with the engine switch off.
Maintain the engine speed of the second vehicle and start the engine of your
vehicle by turning the engine switch to IGNITION ON mode.
Once your vehicle’s engine has started, remove the jumper cables in the exact
reverse order in which they were connected.
Once the engine starts, have the vehicle checked at your Lexus dealer as soon
as possible.
■Starting the engine when the battery is discharged
The engine cannot be started by push-starting.
■To prevent battery discharge
●Turn off the headlights and the audio system while the engine is off.
●Turn off any unnecessary electrical components when the vehicle is running at a low
speed for an extended period , such as in heavy traffic.
■Charging the battery
The electricity stored in the battery will disc harge gradually even when the vehicle is not
in use, due to natural discharge and the draini ng effects of certain electrical appliances. If
the vehicle is left for a long time, the battery may discharge, and the engine may be
unable to start. (The battery recharges automatically during driving.)
■When recharging or replacing the battery
●In some cases, it may not be possible to un lock the doors using the smart access system
with push-button start when the battery is discharged. Use the wireless remote control
or the mechanical key to lock or unlock the doors.
●The engine may not start on the first attempt after the battery has recharged but will
start normally after the second attempt. This is not a malfunction.
●The engine switch mode is memorized by the vehicle. When the battery is recon-
nected, the system will return to the mode it was in before the battery was discharged.
Before disconnecting the battery, turn the engine switch off. If you are unsure what
mode the engine switch was in before the battery discharged, be especially careful
when reconnecting the battery.
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5477-2. Steps to take in an emergency
GX460_OM_OM60R27U_(U)
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When trouble arises
The coolant level is satisfactory if it is between the “F” and “L” lines on the res-
ervoir. Reservoir
“F”
“L”
Radiator cap
Add coolant if necessary.
Water can be used in an emergency if
coolant is unavailable.
Start the engine and turn the air conditio ning system on to check that the radi-
ator cooling fans operate and to check for coolant leaks from the radiator or
hoses.
The fans operate when the air conditioning system is turned on immediately after a
cold start. Confirm that the fans are operating by checking the fan sound and air flow.
If it is difficult to check these, turn the air conditioning system on and off repeatedly.
(The fans may not operate in freezing temperatures.)
If the fans are not operating:
Stop the engine immediately an d contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
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GX460_OM_OM60R27U_(U)8-1. Specifications
■Engine number
The engine number is stamped on
the engine block as shown.
*: The engine oil capacity is a reference quantity to be used when changing the engine
oil. Warm up and turn off the engine, wait more than 5 minutes, and check the oil level
on the dipstick.
Engine
Model4.6 L 8-cylinder (1UR-FE)
Type8-cylinder V type, 4-cycle, gasoline
Bore and stroke3.70  3.27 in. (94.0  83.0 mm)
Displacement281.2 cu.in. (4608 cm3)
Valve clearanceAutomatic adjustment
Drive belt tensionAutomatic adjustment
Fuel
Fuel typeUnleaded gasoline only
Octane rating91 (Research Octane Number 96) or higher
Fuel tank capacity (Reference)23.0 gal. (87 L, 19.1 Imp.gal.)
Lubrication system
Oil capacity
(Drain and refill — reference*)
With filter
Without filter8.2 qt. (7.8 L, 6.9 Imp.qt.)
7.8 qt. (7.4 L, 6.5 Imp.qt.)

GX460_OM_OM60R27U_(U)
5578-1. Specifications
8
Vehicle specifications
*: Your Lexus vehicle is filled with “Toyota Genuine Differential Gear Oil” at the factory.Use Lexus approved “Toyota Genuine Differ ential Gear Oil” or an equivalent of
matching quality to satisfy the above specification. Please contact your Lexus dealer
for further details.
*: Your Lexus vehicle is filled with “Toyota Genuine Differential Gear Oil” at the factory. Use Lexus approved “Toyota Genuine Differ ential Gear Oil” or an equivalent of
matching quality to satisfy the above specification. Please contact your Lexus dealer
for further details.
Electrical system (battery)
Specific gravity reading at
68 F (20 C):12.3 V or higher
In the case the voltage is less than standard,
charge battery.
(Voltage is checked 20 minutes after the engine)
Charging rates5 A max.
Front differential
Oil capacity1.48 qt. (1.40 L, 1.23 Imp.qt.)
Oil type and viscosity*Toyota Genuine Differential Gear Oil LT 75W-85
GL-5 or equivalent
Rear differential
Oil capacity2.85 qt. (2.70 L, 2.38 Imp.qt.)
Oil type and viscosity*Toyota Genuine Differential Gear Oil LT 75W-85
GL-5 or equivalent

602What to do if... (Troubleshooting)
GX460_OM_OM60R27U_(U)
What to do if... (Troubleshooting)
●If you lose your mechanical keys, ne w genuine mechanical keys can be made
by your Lexus dealer. ( P. 101)
●If you lose your electronic keys, the risk of vehicle theft increases significantly.
Contact your Lexus dealer immediately. ( P. 103)
●Is the electronic key battery weak or depleted? ( P. 484)
●Is the engine switch in IGNITION ON mode?
When locking the doors, turn the engine switch off. (P. 197)
●Is the electronic key left inside the vehicle?
When locking the doors, make sure that you have the electronic key on your
person.
●The function may not operate properly du e to the condition of the radio wave.
( P. 123)
●Is the child-protector lock set?
The rear door cannot be opened from in side the vehicle when the lock is set.
Open the rear door from outside and then unlock the child-protector lock.
( P. 107)
If you have a problem, check the foll owing before contacting your Lexus
dealer.
The doors cannot be locked, unlocked, opened or closed
You lose your keys
The doors cannot be locked or unlocked
The rear door cannot be opened

609Alphabetical index
GX460_OM_OM60R27U_(U)
Emergency flashers .............................500
EngineAccessory mode..................................197
Brake Override System .................. 165
Compartment....................................... 451
Drive-Start Control............................ 166
Hood ....................................................... 450
How to start the engine ................... 196
Identification number ...................... 554
If the engine will not start............... 538
Ignition switch (engine switch)..... 196
Overheating ........................................ 546
Engine compartment cover ............. 452
Engine coolant....................................... 455 Capacity ................................................ 556
Checking............................................... 455
Preparing and checking before winter ....................................367
Engine immobilizer system ..................76
Engine oil ................................................. 453 Capacity ................................................ 554
Checking................................................453
Preparing and checking before winter ....................................367
Warning message ............................. 522
Engine oil maintenance data ........... 454
Engine switch ...........................................196
Engine switch light ............................... 392
Event data recorder (EDR) ...................10 Flat tire .......................................................524
Floor mats....................................................26
Fluid
Automatic transmission ................. 558
Brake........................................................559
Steering ................................................. 560
Washer ................................................... 463
Fog lights.................................................... 217 Replacing light bulbs ....................... 497
Switch ........................................................ 217
Four-wheel drive system................... 340
Front passenger occupant classification system ............................ 47
Front passenger’s seat belt reminder light ....................................... 513
Front seats ................................................. 128 Adjustment..............................................128
Cleaning................................................. 437
Correct driving posture .................... 28
Driving position memory...................141
Head restraints .....................................146
Seat heaters ..........................................390
Seat position memory .........................141
Front turn signal lights .........................207 Replacing light bulbs ....................... 493
Turn signal lever ................................. 207
Wattage ...................................................561F

615Alphabetical index
GX460_OM_OM60R27U_(U)
Crawl Control switch ......................344
Cruise control switch.......................254
“DAC” switch...................................... 348
Door lock switches ............................ 106
Driving position memory switches .................................................. 141
Emergency flashers switch .......... 500
Engine switch ........................................ 196
Fog light switch ..................................... 217
Four-wheel drive control switch................................................... 340
Headlight cleaner switch ............... 224
Height control switch...................... 335
LDA (Lane Departure Alert) .......248
Light switches ..................................... 209
Moon roof switches........................... 159
Multi-terrain Monitor switch ....... 288
Multi-terrain Select switch.............284
“ODO TRIP” button ............................89
Outside rear view mirror switches ................................................ 153
Parking assist........................................266
Power door lock switch ...................... 111
Power window switch ...................... 156
Rear window wiper and washer switch................................... 222
Rear window and outside rear view mirror
defoggers switch ............................. 381
Second start mode switch............ 203
Seat heater switches........................ 390
Talk switch
*
Tilt and telescopic steering control switch .................................... 149 Vehicle-to-vehicle distance
switch ................................................... 260
VSC OFF switch ............................... 353
Window lock switch ..........................156
Windshield wipers and washer switch ....................................218
Tachometer ............................................... 88
Tail lights .................................................. 209 Light switch........................................... 209
Replacing light bulbs ....................... 497
Talk switch
*
Telephone switch
*
Theft deterrent system Alarm .......................................................... 78
Engine immobilizer system ..............76
Tire inflation pressure.......................... 476 Maintenance data............................. 560
Tire pressure warning system ......... 465 Function .................................................. 465
Initializing ............................................... 465
Initializing procedures..................... 466
Installing tire pressure warning valves and transmitters................ 465
Registering ID codes ....................... 467
Warning light .........................................513
Tires ............................................................464 Chains ..................................................... 367
Checking ............................................... 464
If you have a flat tire .......................... 524
Inflation pressure................................ 476
Information............................................565
Replacing ............................................... 524
Rotating tires ........................................ 464
T
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL” or “MULTIMEDIA OWNER’S MANUAL”.

616Alphabetical index
GX460_OM_OM60R27U_(U)
Size ........................................................... 560
Snow tires ..............................................367
Spare tire ................................................524
Tire pressure warning system ................................................. 465
Tools........................................................... 525
Towing Dinghy towing ...................................... 195
Emergency towing........................... 505
Towing hooks ..................................... 506
Trailer Sway Control ........................352
Trailer towing ......................................... 177
Trailer Sway Control........................... 352
TRAC (Traction Control) .................. 351
Transmission Automatic transmission ..................202
AVS switch ...........................................339
If the shift lever cannot be shifted from P .................................. 205
Trip meters ................................................. 88
Turn signal lights ................................... 207 Replacing light bulbs............................. 493, 494, 497
Turn signal lever .................................207
Wattage ................................................... 561
USB port
*
Vanity lights Vanity lights ............................................. 411
Wattage ................................................... 561
Vanity mirrors ........................................... 411
Vehicle identification number ......... 553
VSC (Vehicle Stability Control) ..... 351 Warning buzzers .................................... 511
Brake system .......................................... 511
Downshifting ........................................205
Intuitive parking assist...................... 269
LDA (Lane Departure Alert)....... 246
Open back door................................... 110
Open door .............................................. 110
Pre-collision warning....................... 235
Radar cruise control .......................... 261
Seat belt remainder ............................513
Warning lights .......................................... 511 ABS ............................................................ 512
Brake Override System ...................514
Brake system .......................................... 511
Charging system .................................. 511
Drive-Start Control ............................514
High coolant temperature ............... 511
KDSS.......................................................... 512
Low engine oil pressure ................... 511
Low fuel level .........................................513
Malfunction indicator lamp.............. 511
Open door .............................................513
Parking brake indicator .................... 512
PCS ............................................................ 512
Seat belt reminder light ....................513
Slip indicator .......................................... 512
SRS............................................................... 511
Tire pressure warning light .............513
Warning message................................ 520
Warning reflector holder.................. 402
Washer ....................................................... 218 Checking ............................................... 463
Preparing and checking before winter .................................... 367
Switch ........................................................218
Washing and waxing ...........................434
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