
454
Driving
Refueling
Fuel Information
■Fuel recommendation
Use of a lower octane gasoline can cause a persistent, heavy metallic knocking noise 
that can lead to engine damage.
■Top tier detergent gasoline
Because the level of detergency and additives in gasoline vary in the market, Honda 
endorses the use of “TOP TIER Deterg ent Gasoline” where available to help 
maintain the performance and reliability of your vehicle. TOP TIER Detergent 
Gasoline meets a new gasoline standard join tly established by leading automotive 
manufacturers to meet the need s of today’s advanced engines.
Qualifying gasoline retailers will, in most ca ses, identify their gasoline as having met 
“TOP TIER Detergent Gasoline” standards  at the retail location. This fuel is 
guaranteed to contain the proper level of  detergent additives and be free of metallic 
additives. The proper level of detergent  additives, and absence of harmful metallic 
additives in gasoline, help avoid build-up of deposits in your engine and emission 
control system. 
For further important fuel-rel ated information for your vehicle, or on information on 
gasoline that does not contain MMT, visit  www.hondacars.com. In Canada, visit 
www.honda.ca  for additional information on gasoline. For more information on top 
tier gasoline, visit www.toptiergas.com .
■Fuel tank capacity: 7.0 US gal (26.5 liters)
Unleaded gasoline, pump octane number 87 or higher
1Fuel Information
NOTICE
We recommend quality ga soline containing 
detergent additives that help prevent fuel system and 
engine deposits. In  addition, in order to maintain 
good performance, fuel economy, and emissions 
control, we strongly reco mmend the use of gasoline 
that does NOT contain  harmful manganese-based 
fuel additives such as MMT, if such gasoline is 
available.
Use of gasoline with these additives may adversely 
affect performance, a nd cause the malfunction 
indicator lamp on your inst rument panel to come on. 
If this happens, contact an authorized  Honda Clarity 
Plug-In Hybrid dealer for service.
Some gasoline today is ble nded with oxygenates such 
as ethanol. Your vehicle is designed to operate on 
oxygenated gasoline containing up to 15% ethanol 
by volume. Do not use gaso line containing methanol. 
If you notice any undesira ble operating symptoms, try 
another service station or sw itch to another brand of 
gasoline.
19 CLARITY PHEV-31TRW6100.book  454 ページ  2018年10月25日 木曜日 午後2時29分 

490
uuMaintenance Under the Hood uEngine Coolant
Maintenance
Engine Coolant
This coolant is premixed with 50% antifreeze and 50% water. Do not add any 
straight antifreeze or water.
We recommend you check the engine coolan t level every time you refuel or you 
charge the High Voltage battery. Check the re serve tank first. If it is completely 
empty, also check the coolant level in  the radiator. Add the engine coolant 
accordingly.
1. Make sure the engine and radiator are cool.
2. Check the amount of coolant in the reserve 
tank.
u If the coolant level is below the  MIN 
mark, add the specified coolant until it 
reaches the  MAX mark.
3. Inspect the cooling  system for leaks.
Specified coolant: Honda Long  Life Antifreeze/Coolant Type 2
■Reserve Tank
1Engine Coolant
NOTICE
Genuine Honda engine coolan t is a 50/50 mixture of 
antifreeze and water that can withstand freezing at 
temperatures as low as about −31°F (−35°C). If your 
vehicle is consistently subjected to temperatures 
below this, the concentration of antifreeze in the 
coolant should be  increased. Consult an authorized 
Honda Clarity Plug-In Hybrid dealer for details.
If Honda antifreeze /coolant is not available, you may 
use another major brand of  non-silicate coolant as a 
temporary replacement. Check that it is a high quality 
coolant recommended for  aluminum engines. 
Continued use of any non-Honda coolant can result 
in corrosion, causing the cooling system to 
malfunction or fail. Have the cooling system flushed 
and refilled with Honda anti freeze/coolant as soon as 
possible.
Do not add rust inhibitors or other additives to your 
vehicle’s cooling system. They may not be compatible 
with the coolant or with the engine components.
Reserve 
Tank
MAX
MIN
19 CLARITY PHEV-31TRW6100.book  490 ページ  2018年10月25日 木曜日 午後2時29分 

Index
580
Index
Index
Numbers
120V AC (AC Level 1)................................ 459
12-Volt Battery Charging System  Indicator ............................................  90, 548
240V AC (AC Level 2) ................................ 462
A
ABS (Anti-lock Brake System) ................... 440
Accessories and Modifications ................. 521
Accessory Power Sockets ..........................  189
Acoustic Vehicle Alerting System ............ 395
Adaptive Cruise Control (ACC) with Low 
Speed Follow (LSF) .................................. 402
Indicator .................................................. 100
Additives
Coolant ................................................... 490
Engine Oil ................................................ 484
Washer .................................................... 495
Additives, Engine Oil ................................ 484
Adjusting
Armrest ................................................... 182
Front Seats ..............................................  175
Head Restraints........................................ 178
Mirrors .................................................... 173
Steering Wheel ........................................ 172
Temperature ............................................ 126
Agile Handling Assist ................................ 427
Air Conditioning System (Climate Control  System) .................................................... 193
Changing the Mode ................................ 195 Defrosting the Windshield and 
Windows ...............................................  197
Dust and Pollen Filter...............................  514
Sensors ...................................................  201
Synchronized Mode.................................  198
Using Automatic Climate Control ............  193
Air Pressure .......................................  502, 569
Airbags ........................................................  54
Advanced Airbags .....................................  60
Airbag Care...............................................  68
Driver’s Knee Airbag..................................  61
Event Data Recorder ....................................  0
Front Airbags (SRS) ....................................  57
Indicator..............................................  66, 94
Passenger Front Airbag Off Indicator .........  67
Sensors .....................................................  54
Side Airbags ..............................................  63
Side Curtain Airbags..................................  65
AM/FM Radio ............................................  243
Android Auto ...........................................  280
Anti-lock Brake System (ABS) ..................  440
Indicator....................................................  93
Apple CarPlay ...........................................  277
Armrest .....................................................  182
Audio Remote Controls ...........................  207
Audio System ....................................  204, 210
Adjusting the Sound................................  236
Audio/Information Screen........................  211
Changing the Home Screen Icon Layout ..  219
Changing the Screen Interface ................  233
Closing Apps ...........................................  235 Customizing the Meter ...........................  219
Display Setup ..........................................  237
Error Messages .......................................  284
General Information................................  288
Home Screen ..........................................  225
Limitations for Manual Operation ............  238
Menu Customize ....................................  234
MP3/WMA/AAC .....................................  264
Reactivating ............................................  206
Recommended Devices ...........................  290
Remote Controls .....................................  207
Security Code .........................................  206
Selecting an Audio Source ......................  238
Status Area .............................................  232
Theft Protection ......................................  206
USB Flash Drives......................................  290
USB Port .................................................  205
Voice Control Operation .........................  239
Wallpaper Setup .....................................  223
Audio/Information Screen .......................  211
Authorized Manuals ................................  577
Auto Door Locking/Unlocking ................  149
Automatic Brake Hold .............................  438
Indicator ...........................................  87, 438
Automatic Brake Hold System
Indicator ...........................................  87, 438
Automatic Lighting ..................................  163
Average Fuel Economy ............................  126
Average Fuel Economy Records ..............  129
Average Speed .........................................  127
19 CLARITY PHEV-31TRW6100.book  580 ページ  2018年10月25日 木曜日 午後2時29分