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Pressure Release Operation [11/2020 - 12/2023]: Procedure

  1. PRECAUTION 
    NOTE:
    • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

      Refer to BEFORE DISCONNECTING BATTERY [11/2020 - 11/2021] , or refer to BEFORE DISCONNECTING BATTERY [11/2021 - 12/2022] , or refer to BEFORE DISCONNECTING BATTERY [12/2022 - 12/2023]

    • 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.)
      GTY597367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • 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.
      GTY587875Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *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.
      GTY1003078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *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.
  2. REMOVE REAR NO. 4 FLOOR BOARD SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 2 [11/2020 - 11/2021] , or refer to PROCEDURE - Step 2 [11/2021 - 12/2022] , or refer to PROCEDURE - Step 2 [12/2022 - 12/2023]

  3. REMOVE REAR NO. 3 FLOOR BOARD SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 3 [11/2020 - 11/2021] , or refer to PROCEDURE - Step 3 [11/2021 - 12/2022] , or refer to PROCEDURE - Step 3 [12/2022 - 12/2023]

  4. REMOVE NO. 2 FLOOR BOARD SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 4 [11/2020 - 11/2021] , or refer to PROCEDURE - Step 4 [11/2021 - 12/2022] , or refer to PROCEDURE - Step 4 [12/2022 - 12/2023]

  5. REMOVE REAR FLOOR SIDE MEMBER COVER LH 

    Refer to PROCEDURE - Step 6 [11/2020 - 11/2021] , or refer to PROCEDURE - Step 6 [11/2021 - 12/2022] , or refer to PROCEDURE - Step 6 [12/2022 - 12/2023]

  6. REMOVE NO. 1 FLOOR UNDER COVER (for 3 Hydrogen Tank) 

    Refer to PROCEDURE - Step 8 [11/2020 - 11/2021] , or refer to PROCEDURE - Step 8 [11/2021 - 12/2022] , or refer to PROCEDURE - Step 8 [12/2022 - 12/2023]

  7. REMOVE NO. 3 FC EXHAUST PIPE 

    Refer to PROCEDURE - Step 5

  8. PRESSURE RELEASE OPERATION (for Low Pressure and Medium Pressure) 
    1. Using an 8 mm hexagon socket wrench, rotate the adjustment bolt clockwise to close the manual valve of the No. 1 hydrogen tank assembly.

      Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) 

      GTY1003171Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Manual Valve Open
      *b Manual Valve Closed
      *c Adjustment Bolt
      *d Clockwise
      NOTE:
      • The manual valve shuts off the pressure from the hydrogen tank assembly, so be careful not to damage the hexagonal portion.
      • If the hexagonal portion has been damaged, the No. 1 hydrogen tank assembly must be replaced.
    2. Using an 8 mm hexagon socket wrench, rotate the adjustment bolt clockwise to close the manual valve of the No. 2 hydrogen tank assembly.

      Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) 

      GTY1003834Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Manual Valve Open
      *b Manual Valve Closed
      *c Adjustment Bolt
      *d Clockwise
      NOTE:
      • The manual valve shuts off the pressure from the hydrogen tank assembly, so be careful not to damage the hexagonal portion.
      • If the hexagonal portion has been damaged, the No. 2 hydrogen tank assembly must be replaced.
    3. For 3 Hydrogen Tank:

      Using an 8 mm hexagon socket wrench, rotate the adjustment bolt clockwise to close the manual valve of the No. 3 hydrogen tank assembly.

      Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) 

      GTY1003345Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Manual Valve Open
      *b Manual Valve Closed
      *c Adjustment Bolt
      *d Clockwise
      NOTE:
      • The manual valve shuts off the pressure from the hydrogen tank assembly, so be careful not to damage the hexagonal portion.
      • If the hexagonal portion has been damaged, the No. 3 hydrogen tank assembly must be replaced.
    4. Before starting the depressurization procedure, first check that there is no mud or other contaminant around the medium pressure leak check port of the hydrogen supply regulator, and clean it as necessary.

      HINT: 

      Installing the No. 1 hydrogen supply regulator plug while any foreign matter adheres to it can cause a hydrogen gas leak.

    5. For 3 Hydrogen Tank:

      Make sure that the manual valves of the No. 1 hydrogen tank assembly, No. 2 hydrogen tank assembly and No. 3 hydrogen tank assembly are closed.

    6. For 2 Hydrogen Tank:

      Make sure that the manual valves of the No. 1 hydrogen tank assembly and No. 2 hydrogen tank assembly are closed.

    7. Slowly loosen the No. 1 hydrogen supply regulator plug until the hissing sound of gas escaping can be heard, then stop loosening the No. 1 hydrogen supply regulator plug and wait for the sound to stop. Repeat this procedure multiple times until the sound stops occurring, in order to depressurize the compressed hydrogen gas from the medium pressure leak check port of the hydrogen supply regulator.
      GTY1003377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WARNING:
      • Do not perform depressurization procedures when the manual valve of the hydrogen tank assembly is open.
      • The highly pressurized hydrogen gas inside the hydrogen tank assembly could blow out, resulting in a serious accident.
      GTY1002134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Manual Valve Open
      • When performing depressurization, do not perform procedures by hand without wearing protective glasses and gloves.
        GTY1002792Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • High pressure nitrogen gas could cause a serious accident.
      NOTE:

      When performing depressurization, only loosen the No. 1 hydrogen supply regulator plug. Do not remove it.

    8. Blow compressed air at the underside of the vehicle to disperse any accumulated hydrogen gas.
      GTY601758Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. Remove the No. 1 hydrogen supply regulator plug 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.

      GTY1003381Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. Remove the O-ring from the hydrogen supply regulator.
      GTY1003019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. To prevent damage to the seal portions and threaded portions, and to prevent foreign matter such as dust or metal fragments from entering the openings, cover the seal portions, threaded portions, and openings of the hydrogen supply regulator with protective tape.
      GTY1003535Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Protective Tape
    12. To prevent damage to the seal portions and threaded portions, and to prevent foreign matter such as dust or metal fragments from entering the openings, do not remove the protective tape covering the seal portions, threaded portions, and openings of the hydrogen supply regulator until immediately before performing work.
      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.

      GTY1004113Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. Apply TOYOTA Genuine FC Grease to a new O-ring and to the threaded portion of the hydrogen supply regulator.
      GTY1004120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    14. Install the O-ring to the hydrogen supply regulator.
      NOTE:

      During installation, make sure not to damage the O-ring.

      GTY1003049Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    15. Using SST install the No. 1 hydrogen supply regulator plug to the hydrogen supply regulator.
      GTY1003656Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Specified tightening torque
      • SST: 09922-10240 

      Torque

      Specified tightening torque 

      9.0 N*m (92 kgf*cm, 80 in.*lbf)

      HINT: 

      • Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.

        Refer to PRECAUTION [11/2020 - ]

      • When using SST (fulcrum length of 40 mm (1.57 in.)) + torque wrench (fulcrum length of 162 mm (6.38 in.)): 7.2 N*m (73 kgf*cm, 64 in.*lbf)
  9. PRESSURE RELEASE OPERATION (for High Pressure) 
    1. Prepare SST (hydrogen venting tool).

      See step  7

    2. Check that the open/close valve of SST (venting stand) is closed.
      GTY543238Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a SST (Venting Stand)
      • SST: 09404-62010 
        1. 09404-06010
    3. Using an 8 mm hexagon socket wrench, rotate the adjustment bolt clockwise to close the manual valve of the No. 1 hydrogen tank assembly.

      Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) 

      GTY1003171Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Manual Valve Open
      *b Manual Valve Closed
      *c Adjustment Bolt
      *d Clockwise
      NOTE:
      • The manual valve shuts off the pressure from the hydrogen tank assembly, so be careful not to damage the hexagonal portion.
      • If the hexagonal portion has been damaged, the No. 1 hydrogen tank assembly must be replaced.
    4. Using an 8 mm hexagon socket wrench, rotate the adjustment bolt clockwise to close the manual valve of the No. 2 hydrogen tank assembly.

      Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) 

      GTY1003834Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Manual Valve Open
      *b Manual Valve Closed
      *c Adjustment Bolt
      *d Clockwise
      NOTE:
      • The manual valve shuts off the pressure from the hydrogen tank assembly, so be careful not to damage the hexagonal portion.
      • If the hexagonal portion has been damaged, the No. 2 hydrogen tank assembly must be replaced.
    5. For 3 Hydrogen Tank:

      Using an 8 mm hexagon socket wrench, rotate the adjustment bolt clockwise to close the manual valve of the No. 3 hydrogen tank assembly.

      Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) 

      GTY1003345Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Manual Valve Open
      *b Manual Valve Closed
      *c Adjustment Bolt
      *d Clockwise
      NOTE:
      • The manual valve shuts off the pressure from the hydrogen tank assembly, so be careful not to damage the hexagonal portion.
      • If the hexagonal portion has been damaged, the No. 3 hydrogen tank assembly must be replaced.
    6. Before starting the depressurization procedure, first check that there is no mud or other contaminant around the medium pressure leak check port of the hydrogen supply regulator, and clean it as necessary.

      HINT: 

      Installing the No. 1 hydrogen supply regulator plug while any foreign matter adheres to it can cause a hydrogen gas leak.

    7. For 3 Hydrogen Tank:

      Make sure that the manual valves of the No. 1 hydrogen tank assembly, No. 2 hydrogen tank assembly and No. 3 hydrogen tank assembly are closed.

    8. For 2 Hydrogen Tank:

      Make sure that the manual valves of the No. 1 hydrogen tank assembly and No. 2 hydrogen tank assembly are closed.

    9. Slowly loosen the No. 1 hydrogen supply regulator plug until the hissing sound of gas escaping can be heard, then stop loosening the No. 1 hydrogen supply regulator plug and wait for the sound to stop. Repeat this procedure multiple times until the sound stops occurring, in order to depressurize the compressed hydrogen gas from the medium pressure leak check port of the hydrogen supply regulator.
      GTY1003377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WARNING:
      • Do not perform depressurization procedures when the manual valve of the hydrogen tank assembly is open.
      • The highly pressurized hydrogen gas inside the hydrogen tank assembly could blow out, resulting in a serious accident.
      GTY1002134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Manual Valve Open
      • When performing depressurization, do not perform procedures by hand without wearing protective glasses and gloves.
        GTY1002792Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • High pressure nitrogen gas could cause a serious accident.
      NOTE:

      When performing depressurization, only loosen the No. 1 hydrogen supply regulator plug. Do not remove it.

    10. Blow compressed air at the underside of the vehicle to disperse any accumulated hydrogen gas.
      GTY601758Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. Remove the No. 1 hydrogen supply regulator plug 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.

      GTY1003381Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    12. Remove the O-ring from the hydrogen supply regulator.
      GTY1003019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. To prevent damage to the seal portions and threaded portions, and to prevent foreign matter such as dust or metal fragments from entering the openings, cover the seal portions, threaded portions, and openings of the hydrogen supply regulator with protective tape.
      GTY1003535Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Protective Tape
    14. To prevent damage to the seal portions and threaded portions, and to prevent foreign matter such as dust or metal fragments from entering the openings, do not remove the protective tape covering the seal portions, threaded portions, and openings of the hydrogen supply regulator until immediately before performing work.
      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.

      GTY1004113Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    15. Apply TOYOTA Genuine FC Grease to a new O-ring and to the threaded portion of the hydrogen supply regulator.
      GTY1004120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    16. Install the O-ring to the hydrogen supply regulator.
      NOTE:

      During installation, make sure not to damage the O-ring.

      GTY1003049Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    17. Connect SST (hydrogen venting tool).
      • SST: 09404-62010 
        1. 09404-06010
        2. 09404-06020
        3. 09404-06030
        4. 09404-06040
        5. 09404-06050
      GTY1004085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Concept of SST (hydrogen venting tool) Connection *b SST (Upper Release Pipe)
      *c SST (Middle Release Pipe) *d SST (Lower Release Pipe)
      *e SST (Venting Stand) *f SST (Flexible Hose)

      HINT: 

      There are 2 types of SST (flexible hose).

      GTY1001698Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Type A *b Type B
    18. For Type A:
      1. Temporarily install SST (flexible hose) to the hydrogen supply regulator.
        • SST: 09404-62010 
          1. 09404-06020
        GTY1003229Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Flexible Hose)
      2. Using SST(open end wrench), tighten SST (flexible hose).
        GTY1004252Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Open End Wrench)
        *b SST (Flexible Hose)
        *c Specified tightening torque
        • SST: 09404-62010 
          1. 09404-06020
        • SST: 09922-10240 

        Torque

        Specified tightening torque 

        9.0 N*m (92 kgf*cm, 80 in.*lbf)

        NOTE:
        • Make sure that SST (flexible hose) does not interfere with part of the vehicle.
        • If SST (flexible hose) interferes with any part of the vehicle, protect it with a piece of cloth, etc.

        HINT: 

        • Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.

          Refer to PRECAUTION [11/2020 - ]

        • When using SST (fulcrum length of 40 mm (1.57 in.)) + torque wrench (fulcrum length of 162 mm (6.38 in.)): 7.2 N*m (73 kgf*cm, 64 in.*lbf)
      3. Connect SST (flexible hose) to SST (Venting Stand).
        GTY593609Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Flexible Hose)
        *b SST (Venting Stand)
        • SST: 09404-62010 
          1. 09404-06010
          2. 09404-06020
    19. For Type B:
      1. Remove the 3 bolts of the hydrogen supply regulator.
        GTY1003059Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Temporarily install SST (flexible hose) to the hydrogen supply regulator.
        GTY1003027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Flexible Hose)
        • SST: 09404-62010 
          1. 09404-06020
      3. Install the hydrogen supply regulator with the 3 bolts.

        Torque: 16.5 N*m (168 kgf*cm, 12 ft.*lbf) 

        GTY1003040Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Using SST(open end wrench), tighten SST (flexible hose).
        GTY1003733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Open End Wrench)
        *b SST (Flexible Hose)
        *c Specified tightening torque
        • SST: 09404-62010 
          1. 09404-06020
        • SST: 09922-10240 

        Torque

        Specified tightening torque 

        9.0 N*m (92 kgf*cm, 80 in.*lbf)

        NOTE:
        • Make sure that SST (flexible hose) does not interfere with part of the vehicle.
        • If SST (flexible hose) interferes with any part of the vehicle, protect it with a piece of cloth, etc.

        HINT: 

        • Calculate the torque wrench reading when changing the fulcrum length of the torque wrench

          Refer to PRECAUTION [11/2020 - ]

        • When using SST (fulcrum length of 40 mm (1.57 in.)) + torque wrench (fulcrum length of 162 mm (6.38 in.)): 7.2 N*m (73 kgf*cm, 64 in.*lbf)
      5. Connect SST (flexible hose) to SST (venting stand).
        GTY593609Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Flexible Hose)
        *b SST (Venting Stand)
        • SST: 09404-62010 
          1. 09404-06010
          2. 09404-06020
    20. Under basic conditions:
      GTY600967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Set SST (hydrogen venting tool) in an outdoor location.
        NOTE:

        Take care that the compressed hydrogen gas that is discharged during the discharging procedure does not enter any indoor location.

    21. Other than basic conditions (when outdoor setup is not possible):
      GTY545516Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. When SST (hydrogen venting tool) will be set up indoors, locate it along a wall near a window, and with the tip of SST (upper release pipe) outdoors.
        NOTE:

        Open windows on two sides or more, and ensure that there is adequate ventilation to prevent the compressed hydrogen gas that is discharged from collecting inside.

    22. Using the GTS, enter the following menus: Powertrain / EV / Utility / Reduce Hydrogen Gas Pressure

      Powertrain > EV > Utility 

      Tester Display
      Reduce Hydrogen Gas Pressure
    23. Perform preliminary leak check (using remaining piping pressure) [Hydrogen leak check].

      HINT: 

      Perform leak check using the pressure remaining upstream of the tank shut valve.

      1. Following the display on the GTS, select to next.
        GTY1167077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Open the tank shut valves of the hydrogen tank assembly.
        GTY1160801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WARNING:
        GTY554118Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • When opening the tank shut valve and applying pressure to SST (hydrogen venting tool), stay away from SST (flexible hose).
        • If SST (flexible hose) comes off, you could be struck by the loose end of SST (flexible hose), causing a serious accident.

        HINT: 

        If the tank shut valve does not open, check that all of the hydrogen tank assembly manual valves are closed, and perform the pressure release operation again.

        GTY1167070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Check the hydrogen pressure.
        GTY1167072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        HYDROGEN PRESSURE:

        Item Specified Condition
        High-Range Hydrogen Pressure 1000 to 87500 kPa (10.2 to 892.3 kgf/cm2 , 145 to 12688 psi)
        Medium-Range Hydrogen Pressure 1000 to 1600 N*m (10198 to 16315 kgf*cm, 738 to 1180 ft.*lbf)
      4. If there are any water droplets, etc. adhering to the measurement locations, wipe them away before performing the procedure.
        NOTE:

        Performing the measurement while any water droplets, etc. are adhering could damage the hydrogen gas detector.

      5. Using SST and a hydrogen gas detector, inspect for leaks in the locations shown in the illustration.
        GTY1167073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • SST: 09401-62020 

        Specified Value

        Less than 500 ppm

        NOTE:

        If any values are outside the specified range, disconnect those locations that have leaks and assemble the parts again.

        GTY1002842Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Locations to Check for Leaks - -
        Leak Check Location - -
    24. Following the display on the GTS, open the tank shut valves of the hydrogen tank assembly.
      GTY1167080Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      If the tank shut valve does not open, check that all of the hydrogen tank assembly manual valves are closed, and perform the pressure release operation again.

      GTY1167070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    25. Open the open/close valve of SST (venting stand), and depressurize compressed hydrogen gas.
      • SST: 09404-62010 
      GTY1167329Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a SST (Venting Tool) - -
    26. When "Reduce Pressure is complete" is displayed, check that the SST (venting stand) pressure indicator is under 0.9 MPa (9 kgf/cm2 ), and close the open/close valve of SST (venting stand).
      • SST: 09404-62010 

      HINT: 

      When the medium-range hydrogen pressure decreases to under 900 kPa (9.2 kgf/cm2 , 131 psi), switch to the pressure reduction complete screen.

      GTY1165613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a SST (Venting Stand) - -
    27. Open the open/close valve of SST (venting stand) and discharge the compressed hydrogen gas remaining inside SST (flexible hose).
      • SST: 09404-62010 
        1. 09404-06010
      NOTE:
      • Do not disconnect SST (flexible hose) while there is still pressure remaining inside it.
      • Continue discharging until the pressure gauge of SST (Venting Stand) becomes "0".
      GTY1165616Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a SST (Venting Tool) - -
    28. Before performing the disconnection procedure, if there are any contaminants such as water droplets adhering near the medium pressure leak check port of the hydrogen supply regulator, wipe them away before performing the procedure.
    29. Disconnect SST (flexible hose) from SST (Venting Stand).
      GTY593609Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a SST (Flexible Hose)
      *b SST (Venting Stand)
      • SST: 09404-62010 
        1. 09404-06010
        2. 09404-06020
    30. For Type A:
      1. Remove SST (flexible hose) from the hydrogen supply regulator.
        GTY1003229Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Flexible Hose)
        • SST: 09404-62010 
          1. 09404-06020
    31. For Type B:
      1. Loosen SST (flexible hose).
        GTY1003894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Flexible Hose)
        • SST: 09404-62010 
          1. 09404-06020
      2. Remove the 3 bolts of the hydrogen supply regulator.
        GTY1004136Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Remove SST (flexible hose) from the hydrogen supply regulator.
        GTY1003915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Flexible Hose)
        • SST: 09404-62010 
          1. 09404-06020
      4. Install the hydrogen supply regulator with the 3 bolts.
        GTY1003176Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Torque: 16.5 N*m (168 kgf*cm, 12 ft.*lbf) 

    32. Remove the O-ring from the hydrogen supply regulator.
      GTY1003019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    33. To prevent damage to the seal portions and threaded portions, and to prevent foreign matter such as dust or metal fragments from entering the openings, cover the seal portions, threaded portions, and openings of the hydrogen supply regulator with protective tape.
      GTY1003535Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Protective Tape
    34. To prevent damage to the seal portions and threaded portions, and to prevent foreign matter such as dust or metal fragments from entering the openings, do not remove the protective tape covering the seal portions, threaded portions, and openings of the hydrogen supply regulator until immediately before performing work.
      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.

      GTY1004113Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    35. Apply TOYOTA Genuine FC Grease to a new O-ring and to the threaded portion of the hydrogen supply regulator.
      GTY1004120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    36. Install the O-ring to the hydrogen supply regulator.
      NOTE:

      During installation, make sure not to damage the O-ring.

      GTY1003049Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    37. Using SST install the No. 1 hydrogen supply regulator plug to the hydrogen supply regulator.
      GTY1003656Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Specified tightening torque
      • SST: 09922-10240 

      Torque

      Specified tightening torque 

      9.0 N*m (92 kgf*cm, 80 in.*lbf)

      HINT: 

      • Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.

        Refer to PRECAUTION [11/2020 - ]

      • When using SST (fulcrum length of 40 mm (1.57 in.)) + torque wrench (fulcrum length of 162 mm (6.38 in.)): 7.2 N*m (73 kgf*cm, 64 in.*lbf)
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