On-Vehicle Inspection [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.

VISUALLY CHECK HOSES, CONNECTIONS AND GASKETS
1. Visually check that the hoses, connections and gaskets have no cracks, leaks or damage.
  NOTE:
  - Detachment or other problems with the engine oil level dipstick, oil filler cap assembly, ventilation hose or other components may cause the engine to run improperly.
  - Air suction caused by disconnections, looseness or cracks in any part of the air induction system between the throttle body with motor assembly and cylinder head sub-assembly will cause engine failure or engine malfunctions.
  If any defects are found, replace parts as necessary.

INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM

WARNING:

To prevent injury due to contact with an operating fan and generator V belt or cooling fan, keep your hands and clothing away from the fan and generator V belt and cooling fans when working in the engine compartment with the engine running or the ignition switch on (IG).

Pre-procedure1

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

Slide the clip and disconnect the No. 2 fuel vapor feed hose from the purge valve (No. 1 vacuum switching valve assembly).

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Start the engine.

Check that vacuum occurs at the purge valve (No. 1 vacuum switching valve assembly) port.

Powertrain > Engine > Active Test

Tester Display
Activate the EVAP Purge VSV

If vacuum does not occur, check the following items.
- Purge valve (No. 1 vacuum switching valve assembly)
  Refer to INSPECTION [09/2023 - ]
- Clogging in the No. 2 fuel vapor feed hose that connects the intake manifold and purge valve (No. 1 vacuum switching valve assembly)
- Voltage from the ECM PRG terminal
  HINT:
  
  Refer to TERMINALS OF ECM [09/2023 - ]
Exit Active Test mode and connect the No. 2 fuel vapor feed hose.
If the result is Not as specified, replace the purge valve (No. 1 vacuum switching valve assembly), wire harness or ECM.

Post-procedure1

Connect the No. 2 fuel vapor feed hose to the purge valve (No. 1 vacuum switching valve assembly) and slide the hose clip to secure it.
HINT:

Refer to PROCEDURE - Step 3

Pre-procedure2

Warm up the engine and drive the vehicle.

Confirm that the purge valve (No. 1 vacuum switching valve assembly) opens.

Powertrain > Engine > Data List

Tester Display
EVAP (Purge) VSV

If the result is not as specified, replace the purge valve (No. 1 vacuum switching valve assembly), wire harness or ECM.

Post-procedure2

None

INSPECT AIR CLEANER HOSE ASSEMBLY

Pre-procedure1

Visual inspection.

Check that the No. 2 air hose, No. 2 fuel vapor feed hose assembly and vacuum hose has no cracks, leaks or damage.

If any defect is found, replace the hose with a new one.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	No. 2 Air Hose	*2	No. 2 fuel vapor feed hose assembly
*3	Vacuum Hose	-	-

Check the operation.

Check that suction occurs at the No. 2 fuel vapor feed hose assembly when applying compressed air into the No. 2 air hose.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	No. 2 Air Hose
*2	No. 2 fuel vapor feed hose assembly

If any defect is found, replace the air cleaner hose assembly with a new one.

Post-procedure1

None

CHECK FUEL TANK AND VENT LINE

Pre-procedure1

Remove the No. 2 engine under cover assembly.
HINT:

Refer to PROCEDURE - Step 1
Remove the front floor cover LH.
HINT:

Refer to PROCEDURE - Step 3

Disconnect the fuel tank evaporation vent tube sub-assembly from the fuel vapor containment valve (close tank with bolt valve assembly).

*1	Fuel Tank Cap Assembly	*2	Fuel Tank Evaporation Vent Tube Sub-assembly
*a	Pressure Gauge	-	-

Connect a pressure gauge to the fuel tank evaporation vent tube sub-assembly.

Apply 4 kPa (0.04 kgf/cm² , 0.6 psi) of pressure to the vent line of the fuel tank assembly.
HINT:

Perform this inspection with the fuel tank assembly less than 90% full. When the fuel tank assembly is full, the fuel fill check valve closes and the pressure is released through the 2 mm (0.0787 in.) orifice. As a result, when the fuel tank cap assembly is removed, the pressure does not decrease smoothly.
Check that the fuel tank assembly pressure is maintained for some time and does not decrease immediately.
HINT:

If the pressure decreases immediately, one of the following may apply:
- The fuel tank cap assembly is not completely tightened.
- The fuel tank cap assembly is damaged.
- Air is leaking from the vent line.
- The fuel tank assembly is damaged.
Remove the fuel tank cap assembly and check that the pressure is released smoothly.
If the pressure is not released smoothly, replace the fuel tank assembly.

Post-procedure1

Connect the fuel tank evaporation vent tube sub-assembly to the fuel vapor containment valve (close tank with bolt valve assembly).
Install the front floor cover LH.
HINT:

Refer to PROCEDURE - Step 20
Install the No. 2 engine under cover assembly.
HINT:

Refer to PROCEDURE - Step 6

INSPECT AIR LINE

Pre-procedure1

Remove the No. 2 engine under cover assembly.
HINT:

Refer to PROCEDURE - Step 1
Remove the front floor cover LH.
HINT:

Refer to PROCEDURE - Step 3

Disconnect the No. 7 fuel tank breather tube from the leak detection pump sub-assembly.

*1	No. 7 Fuel Tank Breather Tube
*a	Air

Check that air flows freely into the air line.
If air does not flow freely into the air line, repair or replace the fuel tank breather tube.

Post-procedure1

Connect the fuel tank breather tube to the leak detection pump sub-assembly.
Install the front floor cover LH.
HINT:

Refer to PROCEDURE - Step 20
Install the No. 2 engine under cover assembly.
HINT:

Refer to PROCEDURE - Step 6