On-Vehicle Inspection [12/2017 - ]: Procedure

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 sub-assembly, PCV 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 engine switch on (IG).

Warm up the engine.
Turn the engine switch off.
Connect the Techstream to the DLC3.

Slide the clip and disconnect the No. 1 fuel vapor feed hose from the fuel vapor feed pipe.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Start the engine.
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Active Test / Activate the Evap Purge VSV

Powertrain > Engine > Active Test

Tester Display
Activate the EVAP Purge VSV

Check that vacuum occurs at the purge VSV port.
If vacuum does not occur, check the following items.
- Purge VSV
- Clogging in the No. 1 fuel vapor feed hose that connects the intake manifold and purge VSV
- Voltage from the ECM PRG terminal
  Refer to TERMINALS OF ECM [12/2017 - 10/2020] , or refer to TERMINALS OF ECM [10/2020 - 10/2023] , or refer to TERMINALS OF ECM [10/2023 - ]
Exit Active Test mode and No. 1 fuel vapor feed hose to the fuel vapor feed pipe, and slide the clip to secure the hose.
If the result is not as specified, replace the purge VSV, wire harness or ECM.

Enter the following menus: Powertrain / Engine / Data List / EVAP (Purge) VSV.

Powertrain > Engine > Data List

Tester Display
EVAP (Purge) VSV

Warm up the engine and drive the vehicle.
Confirm that the purge VSV opens.
If the result is not as specified, replace the purge VSV, wire harness or ECM.

CHECK FUEL TANK AND VENT LINE

Disconnect the fuel tank vent hose sub-assembly from the charcoal canister assembly.

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

Connect a pressure gauge to the fuel tank vent hose 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.
Connect the fuel tank vent hose sub-assembly to the charcoal canister assembly.

INSPECT AIR LINE

Disconnect the air line tube from the canister pump module.

*1	Air Line 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 air line tube.
Connect the air line tube to the canister pump module.