Removal [11/2021 - 12/2022]: Procedure
- PRECAUTION NOTE:
- After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
- Place signs [HIGH PRESSURE GAS WORK IN PROGRESS - DO NOT TOUCH!], etc. to warn other technicians to be cautious. (An example sign is included, so make a copy and use it.)
- When performing depressurization, do not open or close any parts of the hydrogen gas piping except for the following:
- Adjustment bolt of the hydrogen tank assembly manual valve
- Tank shut valve of the hydrogen tank assembly
- No. 1 hydrogen supply regulator plug
- When installing or removing the hydrogen tank assembly, high pressure hydrogen piping, hydrogen inlet receptacle, hydrogen tank tube joint assembly or hydrogen supply regulator, to prevent strain such as twisting from being applied to the high pressure hydrogen piping.
- Even when not removing or installing the high pressure hydrogen piping, be careful not to pull or otherwise apply strain to the high pressure hydrogen piping.
- When reusable parts such as the hydrogen tank assembly valve portion, hydrogen inlet receptacle, hydrogen tank tube joint assembly and hydrogen supply regulator have been removed, to protect the seal portions and threaded portions from damage as well as to prevent foreign matter such as dust and metal fragments from entering through openings, cover these areas with protective tape.
- Do not use packing tape, or any other tape that will leave residue on parts, as protective tape.
- Protect seal portions and threaded portions as shown in the illustration.
*a Protective Tape *b Seal Portion *c Threaded Portion - To protect the seal portions and threaded portions from damage or contamination by foreign matter, remove the protective tape immediately before installation.
- When reassembling components that have been removed, make sure that there is no foreign matter adhering to the openings.
- After installing high pressure hydrogen system components, first perform primary leak inspection with low pressure nitrogen gas, and then perform secondary leak inspection.
- Do not insert any sharp objects into the relief valve of the hydrogen supply regulator.
*a Atmosphere Ventilation Hole Cap *b Relief Valve - Do not remove the atmosphere ventilation hole cap of the hydrogen supply regulator.
- When the vehicle is parked with the ignition switch off, if the FC control ECU judges that the FC stack temperature will go below 0°C (32°F), it activates the FC air compressor, hydrogen pump and FC cooling water pump for a maximum of 180 seconds and drains water from the FC stack assembly. When performing inspection or repairs with the ignition switch off (not on (IG) or on (READY)), disconnect the cable from the negative (-) auxiliary battery terminal before performing work.
- When frost has formed on the hydrogen tank assembly or piping, water droplets may be formed when the frost begins to melt. If water droplets enter the tank or piping, it could result in blockage of the hydrogen piping, so do not allow water droplets to enter the tank or piping.
- REMOVE REAR NO. 4 FLOOR BOARD SUB-ASSEMBLY
Refer to PROCEDURE - Step 2
- REMOVE REAR NO. 3 FLOOR BOARD SUB-ASSEMBLY
Refer to PROCEDURE - Step 3
- REMOVE NO. 2 FLOOR BOARD SUB-ASSEMBLY
Refer to PROCEDURE - Step 4 - REMOVE NO. 1 FLOOR BOARD SUB-ASSEMBLY
Refer to PROCEDURE - Step 5 - REMOVE REAR FLOOR SIDE MEMBER COVER LH
Refer to PROCEDURE - Step 6
- REMOVE REAR FLOOR SIDE MEMBER COVER RH
Refer to PROCEDURE - Step 7
- REMOVE NO. 1 FLOOR UNDER COVER (for 3 Hydrogen Tank)
Refer to PROCEDURE - Step 8
- REMOVE NO. 1 DIFFERENTIAL SUPPORT PROTECTOR
Refer to PROCEDURE - Step 9
- REMOVE NO. 2 DIFFERENTIAL SUPPORT PROTECTOR
Refer to PROCEDURE - Step 10
- REMOVE REAR SUSPENSION BRACE COVER
- REMOVE NO. 3 FC EXHAUST PIPE
Refer to PROCEDURE - Step 5
- PRESSURE RELEASE OPERATION
Refer to PROCEDURE - Step 9
- DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL
Refer to REMOVAL [11/2021 - 12/2022]
- REMOVE NO. 2 HYDROGEN TANK ASSEMBLY
Refer to REMOVAL [11/2021 - 12/2022]
- REMOVE NO. 8 HYDROGEN TANK TUBE WARNING:
- After performing depressurization procedures, when first loosening the union nut of the high pressure hydrogen piping, do not loosen the union nut by hand without wearing protective glasses and gloves.
- Even when depressurization procedures are performed, the pressurized hydrogen gas inside the high pressure hydrogen piping cannot be completely depressurized, so the highly pressurized hydrogen gas remaining in the high pressure hydrogen piping could blow out, resulting in a serious accident.
- Detach the clamp and using a 19 mm union nut wrench, loosen the union nut and disconnect the No. 8 hydrogen tank tube from the hydrogen supply regulator.NOTE:
When frost has formed on the hydrogen tank assembly or piping, water droplets may be formed when the frost begins to melt. If water droplets enter the tank or piping, it could result in blockage of the hydrogen piping, so do not allow water droplets to enter the tank or piping.
- To prevent contamination by foreign matter, cover the openings of the hydrogen supply regulator with protective tape.
HINT:
When the hydrogen supply regulator will be replaced with a new one, it is not necessary to protect the openings with protective tape.
- To prevent contamination by foreign matter, cover the connecting portions of the No. 8 hydrogen tank tube with plastic bags.
- Detach the clamp and using a 19 mm union nut wrench, loosen the union nut and disconnect the No. 8 hydrogen tank tube from the hydrogen supply regulator.
- REMOVE HYDROGEN SUPPLY REGULATOR ASSEMBLY
- REMOVE NO. 2 HYDROGEN TANK BRACKET