4. Inspect EVAP System Line

Warm up the engine to the normal operating temperature.
Stop the engine.
Connect the vacuum gauge (EVAP control system test equipment vacuum gauge) to the EVAP service port on the purge line.

Fig 1: Connecting Vacuum Gauge
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If you have the hand-held tester:
Force the VSV for EVAP to operate.
1. Connect the hand-held tester to the DLC3.
2. Start the engine.
3. Turn the hand-held tester main switch ON.
4. Select the Active TEST mode on the hand-held tester to operate the VSV for EVAP.
Fig 2: Connecting Hand-Held Tester
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If you have no hand-held tester:
Force the VSV for EVAP to operate.
1. Disconnect the VSV for EVAP connector.
2. Connect the positive (+) and negative (-) leads from the battery to the VSV for EVAP terminals.
3. Start the engine.
Fig 3: Connecting Battery To VSV
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check the vacuum at idle.
Vacuum: Minimum between 0.368 and 19.713 in.Hg (5 to 268 in.Ag) for over 5 seconds

Fig 4: Checking Vacuum
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If the vacuum does not change, it can be concluded that the hose connecting the VSV to the service port has come loose or is blocked, or the VSV is malfunctioning.
If you have the hand-held tester:
Return to the normal VSV for EVAP operation.
1. Stop the engine.
2. Disconnect the hand-held tester from the DLC3.
If you have no hand-held tester:
Return to the normal VSV for EVAP operation.
1. Stop the engine.
2. Disconnect the positive (+) and negative (-) leads from the VSV for EVAP terminal.
3. Reconnect the VSV for EVAP connector.
Disconnect the vacuum gauge from the EVAP service port on the purge line.
Connect a pressure gauge to the EVAP service port on the purge line.

Fig 5: Connecting Pressure Gauge
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If you have the hand-held tester:
Force the VSV for CCV to operate.
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Turn the hand-held tester main switch ON.
4. Select the ACTIVE TEST mode on the hand-held tester to operate the VSV for CCV.
NOTE: Do not start the engine.

HINT:

If the check is not completed within 10 minutes when the VSV for CCV is ON, the forced closure of the VSV for CCV will be reset.

Fig 6: Connect Hand-Held Tester
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If you have no hand-held tester:
Force the VSV for CCV to operate.
1. Disconnect the VSV for CCV connector.
2. Connect the positive (+) and negative (-) leads from the battery to the VSV for CCV terminals.
Fig 7: Connecting Battery To VSV
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check the pressure.
1. Add the pressure (13.5 to 15.5 in.Ag) from the EVAP service port.
  Pressure: 2 minutes after the pressure is added, the gauge should be over 7.7 to 8.8 in.Ag.
  
  HINT:
  
  If pressure cannot be added, it can be concluded that the hose connecting the VSV for the EVAP canister fuel tank has slipped off or the VSV is open.
  
  Fig 8: Checking Pressure
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check if the pressure decreases when the fuel tank cap is removed while adding pressure.
Fig 9: Releasing Pressure
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If the pressure does not decrease when the fuel tank cap is removed, then it can be concluded that the hose connecting the service port to the fuel tank is blocked, etc.
If you have the hand-held tester:
Return to the normal VSV for CCV operation.
1. Turn ignition switch OFF.
2. Disconnect the hand-held tester from the DLC3.
If you have no hand-held tester:
Return to the normal VSV for CCV operation.
1. Disconnect the positive (+) and negative (-) leads from the VSV for CCV terminals.
2. Reconnect the VSV for CCV connector.
Disconnect the pressure gauge from the EVAP service port on the purge line.