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 / Trouble Codes.
8. Confirm DTCs and freeze frame data.

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

   NOTE:

   If the reference pressure difference between the first and second checks is more than the specification, all the DTCs relating to the reference pressure (P043E, P043F, P2401, P2402 and P2419) are stored.

   Fig 1: EVAP System DTC Table

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NEXT: Go to next step 

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 DTCs are displayed, perform Monitor Confirmation (see "Diagnostic Help" menu). 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 Check (Manual Operation)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   DTC No.*	Result	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 stored in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedure above.

B → See step   29 

A: Go to next step 

Fig 4: EVAP System Check (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 No.*	Result	Trouble Area	Proceed to
   -	Virtually no variation in EVAP pressure during step 1/5, and 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 stored in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedure above.

   HINT: 

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

B → See step   22 

A: Go to next step 

Fig 5: EVAP System Check (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 No.*	Result	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 higher	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) higher than -0.25 kPa-g (-1.88 mmHg-g)	Vent valve stuck closed	D

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

B → See step   11 

C → See step   29 

D → See step   20 

A: Go to next step 

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   DTC No.*	Result	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 stored in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedure above.

B → See step   19 

C → See step   29 

A: Go to next step 

Fig 7: EVAP System Check (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) in 30 seconds.
2. Measure the EVAP pressure and record it.

   HINT: 

   A few minutes are required for the EVAP pressure to become stable. When there is little fuel in the fuel tank, it takes up to 15 minutes.

NEXT: Go to next step 

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   DTC No.*	Result	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 purge line 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 stored in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedure above.

B → See step   15 

C → See step   12 

A: Go to next step 

Fig 9: EVAP System Check (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 No.*	Result	Trouble Area	Proceed to
   -	EVAP pressure (step 3/5) below second reference pressure (step 5/5)	Not yet determined (no leak from EVAP system)	A
   P0441 and P0455	EVAP pressure (step 3/5) higher than [second reference pressure (step 5/5) x 0.2]	Purge VSV stuck open EVAP gross leak	B
   P0456	EVAP pressure (step 3/5) higher than second reference pressure (step 5/5)	EVAP small leak	B

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

A → See step   35 

B → See step   12 

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   DTC No.*	Result	Trouble Area	Proceed to
   P043F	EVAP pressure less than reference pressure measured in step 2/5	Reference orifice high-flow	A
   P2401	EVAP pressure almost same as reference pressure measured in step 2/5	Leak detection pump stuck OFF	B

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

   HINT: 

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

A → See step   29 

B → See step   22 

Fig 11: Disconnecting Purge VSV Hose

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for EVAP Control.
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	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 purge line between purge VSV and intake manifold	C

   TEXT IN ILLUSTRATION
   
   

   *1	Purge VSV
   *2	Hose (to Canister)

B → See step   14 

C → See step   15 

A: Go to next step 

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

   HINT: 

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

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

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

A → See step   28 

B → See step   26 

C → See step   27 

Fig 12: Inspecting Purge VSV

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch off.
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	Trouble Area	Proceed to
   No suction	ECM	A
   Suction applied	Purge VSV	B

   TEXT IN ILLUSTRATION
   
   

   *1	Purge VSV
   *2	Hose (to Canister)

A → See step   34 

B → See step   30 

Fig 13: Checking Purge Line (Purge VSV - Intake Manifold)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the hose (connected to the intake manifold) from the purge VSV.
2. Start the engine.
3. Use your finger to confirm that the hose has suction.
   RESULT
   
   

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

   TEXT IN ILLUSTRATION
   
   

   *1	Purge VSV
   *2	Hose (to Intake Manifold)

B → See step   25 

A: Go to next step 

Fig 14: Inspecting Purge VSV

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the purge VSV. Refer to REMOVAL .
2. Apply battery voltage to the terminals of the purge VSV.
3. Using an air gun, confirm that air flows from port A to port B.
   RESULT
   
   

   Result	Trouble Area	Proceed to
   Air flows	-	A
   No airflow	Purge VSV	B

B → See step   30 

A: Go to next step 

Fig 15: Checking (Power Source Of Purge VSV)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the purge VSV connector.
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	Trouble Area	Proceed to
   B18-1 - Body ground	Ignition switch ON	11 to 14 V	Normal	A
   	Ignition switch ON	Other than condition above	Wire harness or connectors between purge VSV and battery	B

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Purge VSV)

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

   Tester Connection	Condition	Specified Condition
   B30-28 (PRG) - B18-2	Always	Below 1 Ω
   B30-28 (PRG) - Body ground	Always	10 kΩ or higher
   B18-1 - Body ground	Always	10 kΩ or higher

OK → See step   34 

NG → See step   31 

Fig 16: Inspectnig Canister Pump Module (Power Source For Vent Valve)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch off.
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	Trouble Area	Proceed to
   H20-5 (VLVB) - Body ground	Ignition switch ON	11 to 14 V	Wire harness between vent valve and ECM Vent valve ECM	A
   	Ignition switch ON	Below 3 V	Power source wire harness of vent valve	B

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Canister Pump Module)

B → See step   31 

A: Go to next step 

Fig 17: Inspecting Canister Pump Module (Vent Valve Operation)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch off.
2. Disconnect the canister pump module connector.
3. Apply battery voltage to terminals 5 (VLVB) and 1 (VGND) of the canister pump module.
4. Touch the canister pump module to confirm the vent valve operation.
   RESULT
   
   

   Result	Trouble Area	Proceed to
   Operating	1. Wire harness between vent valve and ECM 2. ECM	A
   Not operating	Vent valve	B

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Canister)

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	Trouble Area	Proceed to
   A35-42 (VPMP) - H20-1 (VGND)	Always	Below 1 Ω	ECM	A
   	Always	10 kΩ or higher	Wire harness between ECM and canister pump module	B

A → See step   34 

B → See step   31 

Fig 18: Canister Pump Module Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch off.
2. Disconnect the canister pump module connector.
3. Turn the ignition switch to ON.
4. Enter the following menus: Powertrain / Engine / 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	Trouble Area	Proceed to
   H20-3 (MTRB) - Body ground	Leak detection pump is turned ON and OFF using the Techstream	Below 3 V when OFF 9 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	Wire harness between leak detection pump and ECM ECM	B
   		11 to 14 V when OFF and ON	ECM	C

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Canister Pump Module)

B → See step   24 

C → See step   34 

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	Trouble Area	Proceed to
   H20-4 (MGND) - Body ground	Always	Below 1 Ω	Leak detection pump	A
   	Always	10 kΩ or higher	Wire harness between canister pump module and body ground	B

A → See step   29 

B → See step   31 

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

   Tester Connection	Condition	Specified Condition	Trouble Area	Proceed to
   A35-34 (MPMP) - H20-3 (MTRB)	Always	Below 1 Ω	ECM	A
   	Always	10 kΩ or higher	Wire harness between ECM and canister pump module	B

A → See step   34 

B → See step   31 

1. Stop the engine.
2. Disconnect the purge line 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	Trouble Area	Proceed to
   Suction applied	Purge line between intake manifold and purge VSV	A
   No suction	Intake manifold	B

5. Reconnect the purge line.

A → See step   32 

B → See step   33 

HINT: 

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

NEXT → See step   36 

HINT: 

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

NEXT → See step   36 

Fig 19: Connecting EVAP Leak Tester

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the vent hose.
2. Connect an EVAP tester to the canister pump module with an 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 the leak point.
6. Repair or replace the leak point.

   HINT: 

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

NEXT → See step   36 

1. Replace the canister. 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: EVAP System Component Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Fuel Tank Vent Hose	*2	Vent Hose
   *3	Air Inlet Port	*4	Fuel Tank
   *5	Canister	-	-
   *a	Inspection Area (check for disconnection and/or cracks)	-	-

NEXT → See step   36 

1. Replace the purge VSV. Refer to REMOVAL .

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 were confirmed when the vehicle was brought in.

NEXT: Go to next step 

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 DTCs are output, the repair has been successfully completed.

NEXT → END