EVAP System: Procedure

CONFIRM DTC
1. Turn the engine switch off and wait for 10 seconds.
2. Turn the engine switch on (IG).
3. Turn the engine switch off and wait for 10 seconds.
4. Connect Techstream to the DLC3.
5. Turn the engine switch on (IG).
6. Enter the following menus: Powertrain / Engine / Trouble Codes.
7. Confirm DTCs and freeze frame data.
  If any EVAP system DTCs are set, the malfunctioning area can be determined using the table below.
  
  NOTE:
  If the 0.02 inch reference pressure difference between the first and second checks is greater than the specification, the DTCs corresponding to the reference pressure (P043E, P043F, P0441, P0455, P0456, P2401 and P2420) will all be stored.
  
  Fig 1: Identifying DTC Malfunctioning Area Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NEXT: Go to next step
PERFORM EVAPORATIVE SYSTEM CHECK (AUTOMATIC MODE)
NOTE:
- In the Evaporative System Check (Automatic Mode), the series of 5 Evaporative System Check step are performed automatically. It takes a maximum of approximately 18 minutes.
- Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the leak check of the fuel tank unavailable.
- Do not run the engine in this step.
- When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the temperature below 35°C (95°F).
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode.
3. After the Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine / Trouble Codes / Pending.
  HINT:
  
  If no pending DTC is displayed, perform the Monitor Confirmation after the repair is completed. After this confirmation, check for pending DTCs. If no DTC is displayed, the EVAP system is normal.
NEXT: Go to next step
PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE)

Fig 2: Performing Evaporative System Check (Manual Mode)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE:
- In the Evaporative System Check (Manual Mode), the series of 5 Evaporative System Check step are performed manually.
- Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the leak check of the fuel tank unavailable.
- Do not run the engine in this step.
- When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the temperature below 35°C (95°F).
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Manual Mode.
NEXT: Go to next step

PERFORM EVAPORATIVE SYSTEM CHECK (STEP 1/5)

Fig 3: Checking EVAP Pressure Step 1/5

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the EVAP pressure in step 1/5.

Result

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	Virtually no variation in EVAP pressure	Not yet determined	A
P0451	EVAP pressure fluctuates by +/-0.3 kPa (2.25 mmHg) or more	Canister pressure sensor noise	B

*: The DTCs related to the EVAP system are displayed on Techstream when checking.

B → See step 30

A: Go to next step

PERFORM EVAPORATIVE SYSTEM CHECK (STEP 1/5 TO 2/5)

Fig 4: Checking EVAP Pressure Step 1/5 And 2/5

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the EVAP pressure in step 1/5 and 2/5.

Result

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	Virtually no variation in EVAP pressure during step 1/5. Then decreases to 0.02 inch leak pressure standard	Not yet determined	A
P2402	Small difference between EVAP pressures during steps 1/5 and 2/5	Leak detection pump stuck ON	B

*: The DTCs related to the EVAP system are displayed on Techstream when checking.

HINT:

The first 0.02 inch leak pressure standard is the value determined in step 2/5.

B → See step 23

A: Go to next step

PERFORM EVAPORATIVE SYSTEM CHECK (STEP 2/5)

Fig 5: Checking EVAP System (Step 2/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Make a note of the pressures checked in the steps below.

Check the EVAP pressure 4 seconds after the leak detection pump is activated*.

Check the EVAP pressure again when it has stabilized. This pressure is the 0.02 inch leak pressure standard.

*: The leak detection pump begins to operate as step 1/5 is proceeded to step 2/5.

Result

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure in step (b) between -4.85 kPa and -1.06 kPa (-36.38 mmHg and -7.95 mmHg)	Not yet determined	A
P043F and P2401	EVAP pressure in step (b) -1.06 kPa (-7.95 mmHg) or more	0.02 inch orifice high-flow Leak detection pump stuck OFF	B
P043E	EVAP pressure in step (b) below -4.85 kPa (-36.38 mmHg)	0.02 inch orifice clogged	C
P2419	EVAP pressure in step (a) more than -1.06 kPa (-7.95 mmHg)	Vent valve stuck closed	D

*: The DTCs related to the EVAP system are displayed on Techstream when checking.

B → See step 11

C → See step 30

D → See step 19

A: Go to next step

PERFORM EVAPORATIVE SYSTEM CHECK (STEP 2/5 TO 3/5)

Fig 6: Checking Evap Pressure (Step 2/5 To 3/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the EVAP pressure in step 3/5.

Result

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure increases by 0.3 kPa (2.25 mmHg) or more within 10 seconds of proceeding from step 2/5 to step 3/5	Not yet determined	A
P2420	No variation in EVAP pressure despite proceeding from step 2/5 to step 3/5	Vent valve stuck open (vent)	B
P0451	No variation in EVAP pressure during steps 1/5 through 3/5	Canister pressure sensor malfunction (stuck)	C

*: The DTCs related to the EVAP system are displayed on Techstream when checking.

B → See step 20

C → See step 30

A: Go to next step

PERFORM EVAPORATIVE SYSTEM CHECK (STEP 3/5)

Fig 7: Performing Evaporative System Check (Step 3/5)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Wait until the EVAP pressure change is less than 0.1 kPa (0.75 mmHg) for 30 seconds.
2. Measure the EVAP pressure and record it.
  HINT:
  
  A few minutes are required for the EVAP pressure to become saturated. When there is little fuel in the fuel tank, it takes up to 15 minutes.
NEXT: Go to next step

PERFORM EVAPORATIVE SYSTEM CHECK (STEP 4/5)

Fig 8: Checking EVAP Pressure (Step 4/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the EVAP pressure in step 4/5.

Result

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure increases by 0.3 kPa (2.25 mmHg) or more within 10 seconds of proceeding from step 3/5 to step 4/5	Not yet determined	A
P0441	EVAP pressure increases by 0.3 kPa (2.25 mmHg) or more within 10 seconds of proceeding from step 3/5 to step 4/5	Problems in EVAP hose between purge VSV and intake manifold	B
P0441	Variation in EVAP pressure less than 0.3 kPa (2.25 mmHg) for 10 seconds, after proceeding from step 3/5 to step 4/5	Purge VSV stuck closed	C

*: The DTCs related to the EVAP system are displayed on Techstream when checking.

B → See step 15

C → See step 12

A: Go to next step

PERFORM EVAPORATIVE SYSTEM CHECK (STEP 5/5)

Fig 9: Checking EVAP Pressure (Step 5/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the EVAP pressure in step 5/5.

Compare the EVAP pressure in step 3/5 and the second 0.02 inch leak pressure standard (step 5/5).

Result

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure (step 3/5) lower than second 0.02 inch leak pressure standard (step 5/5)	Not yet determined	A
P0441 and P0455	EVAP pressure (step 3/5) higher than [second 0.02 inch leak pressure standard (step 5/5) x 0.2]	Purge VSV stuck open EVAP gross leak	B
P0456	EVAP pressure (step 3/5) higher than second 0.02 inch leak pressure standard (step 5/5)	EVAP small leak	B

*: The DTCs related to the EVAP system are displayed on Techstream when checking.

A → See step 36

B → See step 12

PERFORM EVAPORATIVE SYSTEM CHECK (STEP 3/5)

Fig 10: Checking EVAP Pressure (Step 3/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the EVAP pressure in step 3/5.

Result

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
P043F	EVAP pressure less than [0.02 inch leak pressure standard] measured at 2/5	0.02 inch orifice high-flow	A
P2401	EVAP pressure almost same as [0.02 inch leak pressure standard] measured at 2/5	Leak detection pump stuck OFF	B

*: The DTCs related to the EVAP system are displayed on Techstream when checking.

HINT:

The first 0.02 inch leak pressure standard is the value determined in step 2/5.

A → See step 30

B → See step 23

PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)

Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for Evap Control.

Fig 11: Identifying Canister Hose
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the hose (connected to the canister) from the purge VSV.
Turn the engine switch on (IG).
Using the tester, turn the purge VSV OFF.
Use your finger to confirm that the purge VSV has no suction.
Using the tester, turn the purge VSV ON.

Use your finger to confirm that the purge VSV has suction.

Result

Test Result	Suspected Trouble Area	Proceed to
No suction when purge VSV turned OFF, and suction applied when turned ON	Purge VSV normal	A
Suction applied when purge VSV turned OFF	Purge VSV stuck open	B
No suction when purge VSV turned ON	Purge VSV stuck closed Problems with EVAP hose between purge VSV and intake manifold	C

B → See step 14

C → See step 15

A: Go to next step

CHECK FUEL CAP

Check that the fuel cap is correctly installed.

Confirm that the fuel cap is tightened until a few click sounds are heard.

HINT:

If an EVAP tester is available, check the fuel cap using the tester.

Remove the fuel cap and install it onto the fuel cap adaptor.
Connect an EVAP tester pump hose to the adaptor, and pressurize the cap to 3.2 to 3.7 kPa (24 to 28 mmHg) using an EVAP tester pump.
Seal the adaptor and wait for 2 minutes.

Check the pressure. If the pressure is 2 kPa (15 mmHg) or more, the fuel cap is normal.

Result

Test Result	Suspected Trouble Area	Proceed to
Fuel cap correctly installed	-	A
Fuel cap loose	Fuel cap improperly installed Defective fuel cap Fuel cap does not meet OEM specifications	B
No fuel cap	-	C

A → See step 29

B → See step 27

C → See step 28

INSPECT DUTY VACUUM SWITCHING VALVE (PURGE VSV)

Turn the engine switch off.

Fig 12: Disconnecting E15 Purge VSV Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the E15 purge VSV connector.
Disconnect the hose (connected to the canister) from the purge VSV.
Start the engine.

Use your finger to confirm that the purge VSV has no suction.

Result

Test Result	Suspected Trouble Area	Proceed to
No suction	ECM	A
Suction applied	Purge VSV	B

A → See step 35

B → See step 31

CHECK EVAP HOSE (PURGE VSV - THROTTLE BODY)

Disconnect the hose (connected to the throttle body) from the purge VSV.

Fig 13: Disconnecting Throttle Body Hose
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the engine switch on (IG).

Use your finger to confirm that the hose has suction.

Result

Test Result	Suspected Trouble Area	Proceed to
Suction applied	EVAP hose between purge VSV and throttle body normal	A
No suction	Intake manifold port EVAP hose between purge VSV and throttle body	B

Reconnect the hose.

B → See step 26

A: Go to next step

INSPECT DUTY VACUUM SWITCHING VALVE (PURGE VSV)

Remove the purge VSV connector.

Fig 14: Inspecting Duty Vacuum Switching Valve (Purge VSV)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Apply battery voltage to the terminals of the purge VSV.

Using an air gun, confirm that air flows from port A to port B.

Result

Test Result	Suspected Trouble Area	Proceed to
Air flows	Purge VSV normal	A
No air flows	Purge VSV	B

Install the purge VSV.

B → See step 31

A: Go to next step

CHECK HARNESS AND CONNECTOR (POWER SOURCE OF PURGE VSV)

Disconnect the E15 purge VSV connector.
Turn the engine switch on (IG).

Measure the voltage between terminal 1 of the purge VSV connector and body ground.

Result

Test Result	Suspected Trouble Area	Proceed to
Between 11 V and 14 V	Normal	A
Other than result above	Wire harness or connectors between purge VSV and ECM	B

Reconnect the purge VSV connector.

B → See step 32

A: Go to next step

CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

Disconnect the E3 ECM connector and the E15 purge VSV connectors.

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection	Specified Condition
PRG (E3-11) - E15-2	Below 1 Ω
PRG (E3-11) - Body ground	10 kΩ or higher
E15-2 - Body ground	10 kΩ or higher

Reconnect the purge VSV connector.
Reconnect the ECM connector.

OK → See step 35

NG → See step 32

PERFORM ACTIVE TEST USING TECHSTREAM (FOR VENT VALVE)

Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for Vent valve.

Measure the voltage between terminal VPMP of the ECM connector and body ground when the vent valve is turned ON (close) and OFF (vent) using the tester.

Result

Test Result	Suspected Trouble Area	Proceed to
Between 9 V and 14 V when OFF Below 3 V when ON	Vent valve	A
Below 3 V when OFF and ON	ECM	B

A → See step 22

B → See step 35

PERFORM ACTIVE TEST USING TECHSTREAM (FOR VENT VALVE)

Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for Vent valve.

Measure the voltage between terminal VPMP of the ECM connector and body ground when the vent valve is turned ON (close) and OFF (vent) using the tester.

Result

Test Result	Suspected Trouble Area	Proceed to
Between 3 V when OFF and ON	Power source of vent valve	A
Between 9 V and 14 V when OFF Below 3 V when ON	Vent valve	B
Between 9 V and 14 V when OFF and ON	ECM	C

B → See step 22

C → See step 35

A: Go to next step

INSPECT CANISTER ASSEMBLY (POWER SOURCE FOR VENT VALVE)

Turn the engine switch off.

Fig 17: Inspecting Canister Assembly (Power Source For Vent Valve)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the Q49 canister pump module connector.
Turn the engine switch on (IG).

Measure the voltage between terminal 9 of the canister connector and body ground.

Result

Test Result	Suspected Trouble Area	Proceed to
Between 9 V and 14 V	Normal	A
Between 0 V and 3 V	Power source wire harness of vent valve	B

Reconnect the canister pump module connector.

B → See step 32

A: Go to next step

INSPECT CANISTER ASSEMBLY (VENT VALVE OPERATION)

Turn the engine switch off.

Fig 18: Inspecting Canister Assembly (Vent Valve Operation)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the Q49 canister pump module connector.
Apply the battery voltage to terminals 9 and 8 of the canister pump module.

Touch the canister pump module to confirm the vent valve operation.

Result

Test Result	Suspected Trouble Area	Proceed to
Operating	Wire harness between vent valve and ECM	A
Not operating	Vent valve	B

Reconnect the canister pump module connector.

A → See step 32

B → See step 30

PERFORM ACTIVE TEST USING TECHSTREAM (FOR CANISTER PUMP MODULE (VACUUM CAP))

Enter the following menus: Powertrain / Engine / Active Test / Activate the Vacuum Pump.

Fig 19: Identifying A6 ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage between MPMP terminal of ECM connector and body ground when the leak detection pump is turned ON and OFF using the tester.

Result

Test Result	Suspected Trouble Area	Proceed to
Between 0 V and 3 V when OFF Between 9 V and 14 V when ON	ECM normal	A
Between 9 V and 14 V when OFF Between 0 V and 3 V when ON	ECM	B

B → See step 35

A: Go to next step

CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

Turn the engine switch off.
Disconnect the Q49 canister pump module connector.
Turn the engine switch on (IG).
On Techstream, enter the following menus: Powertrain / Engine / Active Test / Activate the Vacuum Pump.
Turn the leak detection pump ON.

Measure the voltage between terminal 1 of the canister connector and body ground.

Result

Test Result	Suspected Trouble Area	Proceed to
Between 9 V and 14 V	Normal	A
Between 0 V and 3 V	Wire harness between ECM and leak detection pump	B

Reconnect the canister pump module connector.

B → See step 32

A: Go to next step

CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - GROUND)

Disconnect the Q49 canister pump module connector.
Turn the engine switch off.

Measure the resistance between terminal 6 of the canister connector and body ground.

Result

Test Result	Suspected Trouble Area	Proceed to
Below 1 Ω	Leak detection Pump	A
10 kΩ or higher	Wire harness between leak detection pump and body ground	B

Reconnect the canister pump module connector.

A → See step 30

B → See step 32

INSPECT THROTTLE BODY (EVAP PURGE PORT)

Turn the engine switch off.
Disconnect the EVAP hose from the intake manifold.
Turn the engine switch on (IG).

Use your finger to confirm that the port of the intake manifold has suction.

Result

Test Result	Suspected Trouble Area	Proceed to
Suction applied	EVAP hose between intake manifold and purge VSV	A
No suction	Intake manifold	B

Reconnect the EVAP hose.

A → See step 33

B → See step 34

REINSTALL OR REPLACE FUEL CAP
HINT:
- When reinstalling the fuel cap, tighten it until a few click sounds are heard.
- When replacing the fuel cap, use a fuel cap that meets OEM specifications, and install it until a few click sounds are heard.
NEXT → See step 37
REPLACE FUEL CAP
HINT:

When installing the fuel cap, tighten it until a few click sounds are heard.

NEXT → See step 37
REPAIR EVAP LEAK PART
1. Disconnect the pressure gauge to the canister with the adapter.
  
  Fig 20: Locating Vent Hose
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the pressure gauge to the canister with the adapter.
  
  Fig 21: Connecting Pressure Gauge w/ Adapter To Canister
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Using SST, pinch the rubber tube to close the canister passage to air.
4. Pressurize the EVAP system to 3.2 to 3.7 kPa (24 to 28 mmHg).
5. Apply soapy water to the piping and connecting parts of the EVAP system. Check for areas where bubbles appear. This indicates leaking points.
6. Repair or replace leaking parts.
  HINT:
  - If the system has leaks, a whistling sound will be heard.
  - Disconnect the hose between the canister and the fuel tank from the canister. Close the canister hose connected to the fuel tank, and conduct an inspection. In this way, the fuel tank can be excluded as an area suspected of causing fuel leaks.
NEXT → See step 37
REPLACE CANISTER ASSEMBLY
NEXT → See step 37
REPLACE DUTY VACUUM SWITCHING VALVE (PURGE VSV)
1. Disconnect the connector and hoses from the purge VSV.
  
  Fig 22: Identifying Purge VSV
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the purge VSV.
3. Install a new purge VSV.
4. Reconnect the connector and hoses.
NEXT → See step 37
REPAIR OR REPLACE HARNESS OR CONNECTOR
NEXT → See step 37
REPLACE EVAP HOSE (THROTTLE BODY - PURGE VSV)
NEXT → See step 37
INSPECT THROTTLE BODY (EVAP PURGE PORT)
1. Remove the throttle body.
2. Check that the EVAP purge port of the throttle body is not clogged. If necessary, replace the throttle body.
NEXT → See step 37
REPLACE ECM
1. Replace the ECM. Refer to REMOVAL .
NEXT → See step 37
REPAIR OR REPLACE PARTS AND COMPONENTS INDICATED BY OUTPUT DTCS
1. Repair the malfunctioning areas indicated by the DTCs that had been confirmed when the vehicle was brought in.
NEXT → See step 37
PERFORM EVAPORATIVE SYSTEM CHECK (AUTOMATIC MODE)
HINT:
- In the Evaporative System Check (Automatic Mode), the series of 5 Evaporative System Check step are performed automatically. IT takes a maximum of approximately 18 minutes.
- Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the leak check of the fuel tank unavailable.
- Do not run the engine in this step.
- When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing an Evaporative System Check, keep the temperature below 35°C (95°F).
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. On Techstream, enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode.
3. After the SYSTEM CHECK is completed, check for pending DTCs by entering the following menus: Powertrain / Engine / Trouble Codes / Pending.
  HINT:
  
  If no pending DTC is found, the repair has been successfully completed.
NEXT → END