EVAP System: Procedure

1. Turn the ignition switch off and wait for 10 seconds.
2. Turn the ignition switch to ON.
3. Turn the ignition switch off and wait for 10 seconds.
4. Connect the Techstream to the DLC3.
5. Turn the ignition switch to ON.
6. Turn the Techstream on.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Confirm DTCs and freeze frame data.

   If any EVAP system DTCs are set, the malfunctioning area can be determined using the table below.

   Fig 1: DTC And Malfunctioning Area Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and Techstream on.
3. Clear DTCs. Refer to DTC CHECK / CLEAR .
4. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
5. After the Evaporative System Check is completed, check for pending DTCs by selecting the following menu items: Powertrain / Engine and ECT / Trouble Codes.

   HINT: 

   If no pending DTCs are displayed, perform the CONFIRMATION DRIVING PATTERN. After this confirmation, check for pending DTCs. If no DTCs are displayed, the EVAP system is normal.

NEXT: Go to next step 

Fig 2: EVAP System Chart (Manual Mode)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and Techstream on.
3. Clear DTCs. Refer to DTC CHECK / CLEAR .
4. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Manual Mode.

NEXT: Go to next step 

Fig 3: EVAP System Chart (Step 1/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Result

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

   *: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.

B → See step   29 

A: Go to next step 

Fig 4: EVAP System Chart (Step 1/5 To 2/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Result

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

   *: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.

   HINT: 

   The first reference pressure is the value determined in step 2/5.

B → See step   22 

A: Go to next step 

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT: 

Make a note of the pressures checked in steps (a) and (b) below.

• (a) Check the EVAP pressure 4 seconds after the leak detection pump is activated*.

  *: The leak detection pump begins to operate as step 1/5 finishes and step 2/5 starts.

• (b) Check the EVAP pressure again when it has stabilized. This pressure is the reference pressure.

  Result

  DTC*	Result	Suspected Trouble Area	Proceed to
  -	EVAP pressure in step (b) between -4.85 kPa-g and -1.057 kPa-g (-36.4 mmHg-g and -7.93 mmHg-g)	Not yet determined	A
  P043F and P2401	EVAP pressure in step (b) -1.057 kPa-g (-7.93 mmHg-g) or more	Reference orifice high-flow Leak detection pump stuck OFF	B
  P043E	EVAP pressure in step (b) below -4.85 kPa-g (-36.4 mmHg-g)	Reference orifice clogged	C
  P2419	EVAP pressure in step (a) more than -1.057 kPa-g (-7.93 mmHg-g)	Vent valve stuck closed	D

  *: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.

B → See step   11 

C → See step   29 

D → See step   20 

A: Go to next step 

Fig 6: EVAP System Chart (Step 2/5 To 3/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the EVAP pressure increase in step 3/5.

   Result

   DTC*	Result	Suspected Trouble Area	Proceed to
   -	EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) 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 output value stuck	C

   *: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.

B → See step   19 

C → See step   29 

A: Go to next step 

Fig 7: EVAP System Chart (Step 3/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Wait until the EVAP pressure change is less than 0.1 kPa-g (0.75 mmHg-g) 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 

Fig 8: EVAP System Chart (Step 4/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the EVAP pressure in step 4/5.

   Result

   DTC*	Result	Suspected Trouble Area	Proceed to
   -	EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) 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-g (2.25 mmHg-g) 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-g (2.25 mmHg-g) for 10 seconds, after proceeding from step 3/5 to step 4/5	Purge VSV stuck closed	C

   *: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.

B → See step   15 

C → See step   12 

A: Go to next step 

Fig 9: EVAP System Chart (Step 5/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the EVAP pressure in step 5/5.
2. Compare the EVAP pressure in step 3/5 and the second reference pressure (step 5/5).

   Result

   DTC*	Result	Suspected Trouble Area	Proceed to
   -	EVAP pressure (step 3/5) lower than second reference pressure (step 5/5)	Not yet determined (no leak from EVAP system)	A
   P0451 and P0455	EVAP pressure (step 3/5) higher than [second reference pressure (step 5/5) x 0.2]	EVAP gross leak Purge VSV stuck open	B
   P0456	EVAP pressure (step 3/5) higher than second reference pressure (step 5/5)	EVAP small leak	B

   *: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.

A → See step   35 

B → See step   12 

Fig 10: EVAP System Chart (Step 3/5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the EVAP pressure in step 3/5.

   Result

   DTC*	Result	Suspected Trouble Area	Proceed to
   P043F	EVAP pressure less than [reference pressure] measured at 2/5	Reference orifice high-flow	A
   P2401	EVAP pressure almost same as [reference pressure] measured at 2/5	Leak detection pump stuck OFF	B

   *: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.

   HINT: 

   The first reference pressure is the value determined in step 2/5.

A → See step   29 

B → See step   22 

1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for EVAP Control.
   Fig 11: Performing Active Test Using Techstream (Purge VSV)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the hose (connected to the canister) from the purge VSV.
3. Start the engine.
4. Using the Techstream, turn off the purge VSV (Activate the VSV for EVAP Control: OFF).
5. Use your finger to confirm that the purge VSV has no suction.
6. Using the Techstream, turn on the purge VSV (Activate the VSV for EVAP Control: ON).
7. Use your finger to confirm that the purge VSV has suction.

   Result

   Result	Suspected Trouble Area	Proceed to
   No suction when purge VSV turned OFF, and suction applied when turned ON	Purge VSV is 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

8. Reconnect the hose.

B → See step   14 

C → See step   15 

A: Go to next step 

1. Check that the fuel cap is correctly installed and confirm that the fuel cap meets OEM specifications.
2. Tighten the fuel cap firmly (only one click sound could be heard).

   HINT: 

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

   1. Remove the fuel cap and install it onto a fuel cap adapter.
   2. Connect an EVAP tester pump hose to the adapter, and pressurize the cap to 3.2 to 3.7 kPa-g (24 to 28 mmHg-g) using an EVAP tester pump.
   3. Seal the adapter and wait for 2 minutes.
   4. Check the pressure. If the pressure is 2 kPa-a (15 mmHg-g) or more, the fuel cap is normal.

   Result

   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
   Defective fuel cap	-	B
   No fuel cap	-	C

A → See step   28 

B → See step   26 

C → See step   27 

1. Turn the ignition switch off.
   Fig 12: Disconnecting Hose From Purge VSV

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the purge VSV connector.
3. Disconnect the hose (connected to the canister) from the purge VSV.
4. Start the engine.
5. Use your finger to confirm that the purge VSV has no suction.

   Result

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

6. Reconnect the purge VSV connector.
7. Reconnect the hose.

A → See step   34 

B → See step   30 

1. Disconnect the hose (connected to the intake manifold) from the purge VSV.
   Fig 13: Checking Evap Hose (Purge VSV - Intake Manifold)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Start the engine.
3. Use your finger to confirm that the hose has suction.

   Result

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

4. Reconnect the hose.

B → See step   25 

A: Go to next step 

1. Remove the purge VSV.
   Fig 14: Inspecting Purge VSV

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage across the terminals of the purge VSV.
3. Confirm that air flows from port A to port B.

   Result

   Result	Condition	Suspected Trouble Area	Proceed to
   Air flows	Apply battery voltage to purge VSV terminals	-	A
   No air flow	Apply battery voltage to purge VSV terminals	Purge VSV	B

4. Reinstall the purge VSV.

B → See step   30 

A: Go to next step 

1. Disconnect the purge VSV connector.
   Fig 15: Identifying Purge VSV Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Result

   Tester Connection	Switch Condition	Specified Condition	Suspected Trouble Area	Proceed to
   B18-2 - Body ground	Ignition switch ON	11 to 14 V	Normal	A
   		Other than result above	Wire harness or connectors between purge VSV and battery	B

4. Reconnect the purge VSV connector.

B → See step   31 

A: Go to next step 

1. Disconnect the ECM connector.
2. Disconnect the purge VSV connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   B29-62 (PRG) - B18-1	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   B29-62 (PRG) or B18-1 - Body ground	Always	10 kΩ or higher

4. Reconnect the ECM connector.
5. Reconnect the purge VSV connector.

OK → See step   34 

NG → See step   31 

1. Turn the ignition switch off.
   Fig 16: Inspecting Canister Pump Module Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the canister pump module connector.
3. Turn the ignition switch to ON.
4. Measure the voltage according to the value(s) in the table below.

   Result

   Tester Connection	Switch Condition	Specified Condition	Suspected Trouble Area	Proceed to
   L17-9 (VLVB) - Body ground	Ignition switch ON	11 to 14 V	Wire harness between vent valve and ECM Vent valve ECM	A
   		Below 3 V	Power source wire harness of vent valve	B

5. Reconnect the canister pump module connector.

B → See step   31 

A: Go to next step 

1. Turn the ignition switch off.
   Fig 17: Inspecting Canister Pump Module Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the canister pump module connector.
3. Apply the battery voltage across VLVB and VGND of the canister pump module.
4. Touch the canister pump module to confirm the vent valve operation.

   Result

   Condition	Test Result	Suspected Trouble Area	Proceed to
   Apply battery voltage to terminals VLVB and VGND	Operating	1. Wire harness between vent valve and ECM 2. ECM	A
   Apply battery voltage to terminals VLVB and VGND	Not operating	Vent valve	B

5. Reconnect the canister pump module connector.

B → See step   29 

A: Go to next step 

1. Disconnect the ECM connector.
2. Disconnect the canister pump module connector.
3. Measure the resistance according to the value(s) in the table below.

   Result

   Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
   A37-42 (VPMP) - L17-8 (VGND)	Always	Below 1 Ω	ECM	A
   		10 kΩ or higher	Wire harness between ECM and canister pump module	B

4. Reconnect the ECM connector.
5. Reconnect the canister pump module connector.

A → See step   34 

B → See step   31 

1. Turn the ignition switch off.
   Fig 18: Inspecting Canister Pump Module Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the canister pump module connector.
3. Turn the ignition switch to ON.
4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump.
5. Measure the voltage according to the value(s) in the table below.

   Result

   Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
   L17-1 (MTRB) - Body ground	Leak detection pump ON and OFF (Active Test ON and OFF)	Below 3 V when OFF 11 to 14 V when ON	Wire harness between leak detection pump and body ground Leak detection pump	A
   		Below 3 V when OFF and ON or 11 to 14 V when OFF and ON	Wire harness between leak detection pump and ECM ECM	B

6. Reconnect the canister pump module connector.

B → See step   24 

A: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the canister pump module connector.
3. Measure the resistance according to the value(s) in the table below.

   Result

   Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
   L17-6 (MGND) - Body ground	Always	Below 1 Ω	Leak detection pump	A
   		10 kΩ or higher	Wire harness between canister pump module and body ground	B

4. Reconnect the canister pump module connector.

A → See step   29 

B → See step   31 

1. Turn the ignition switch off.
2. Disconnect the ECM connector.
3. Disconnect the canister pump module connector.
4. Measure the resistance according to the value(s) in the table below.

   Result

   Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
   A37-34 (MPMP) - L17-1 (MTRB)	Always	Below 1 Ω	ECM	A
   		10 kΩ or higher	Wire harness between ECM and canister pump module	B

5. Reconnect the ECM connector.
6. Reconnect the canister pump module connector.

A → See step   34 

B → See step   31 

1. Stop the engine.
2. Disconnect the EVAP hose from the intake manifold.
3. Start the engine.
4. Use your finger to confirm that the port of the intake manifold has suction.

   Result

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

5. Reconnect the EVAP hose.

A → See step   32 

B → See step   33 

HINT: 

• When reinstalling the fuel tank cap, tighten it until a few click sounds are heard.
• When replacing the fuel tank cap, use a fuel tank cap that meets OEM specifications, and install it until a few click sounds are heard.

NEXT → See step   36 

HINT: 

When replacing the fuel cap, use a fuel cap that meets OEM specifications, and install it until a click sound is heard.

NEXT → See step   36 

1. Disconnect the vent hose.
   Fig 19: Connecting Pressure Gauge To Canister Pump Module With Adapter

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect an EVAP tester to the canister pump module with the adapter.
3. Pressurize the EVAP system to 3.2 to 3.7 kPa (24 to 28 mmHg).
4. Apply soapy water to the piping and connecting parts of the EVAP system.
5. Look for areas where bubbles appear. This indicates a leak point.
6. Repair or replace the leak point.

   HINT: 

   Disconnect the hose between the canister and the fuel tank from the canister. Block the canister side and conduct an inspection. In this way, the fuel tank can be excluded as an area suspected of causing fuel leaks.

NEXT → See step   36 

1. Replace the canister assembly. Refer to REMOVAL .
   NOTE:

   When replacing the canister, check the canister pump module interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose.

   Fig 20: Identifying Fuel Tank Components Location

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NEXT → See step   36 

1. Disconnect the connector and the hoses from the purge VSV.
   Fig 21: 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   36 

NEXT → See step   36 

NEXT → See step   36 

1. Check that the EVAP purge port of the intake manifold is not clogged. If necessary, replace the intake manifold.

NEXT → See step   36 

1. Replace the ECM. Refer to REMOVAL .

NEXT → See step   36 

1. Repair the malfunctioning areas indicated by the DTCs that had been confirmed when the vehicle was brought in.

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and Techstream on.
3. Clear DTCs. Refer to DTC CHECK / CLEAR .
4. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
5. After the Evaporative System Check is completed, check for pending DTCs by selecting the following menu items: Powertrain / Engine and ECT / Trouble Codes / Pending.

   HINT: 

   If no pending DTCs are found, the repair has been successfully completed.

NEXT → END