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Home >> Lexus >> 2011 >> IS 250 RWD V6-2.5L (4GR-FSE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> EVAP System >> Part 1

Part 1





4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: EVAP System
- EVAP System

RELATED DTCS





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





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

DESCRIPTION









NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

While the engine is running, if a predetermined condition (closed- loop etc.) is met, the purge VSV is opened by the ECM and stored fuel vapors in the canister are purged to the intake manifold. The ECM changes the duty cycle ratio of the purge VSV to control purge flow volume.

The purge flow volume is also determined by the intake manifold pressure. Atmospheric pressure is allowed into the canister through the vent valve to ensure that the purge flow is maintained when the negative pressure (vacuum) is applied to the canister.

The following 2 monitors run to confirm appropriate EVAP system operation.

1. Key-off monitor

This monitor checks for Evaporative Emission (EVAP) system leaks and canister pump module malfunctions. The monitor starts 5 hours* after the engine switch is turned off. More than 5 hours are required to allow the fuel to cool down to stabilize the Fuel Tank Pressure (FTP), thus making the EVAP system monitor more accurate.

The electric leak detection pump creates negative pressure (vacuum) in the EVAP system and the pressure is measured. Finally, the ECM monitors for leaks from the EVAP system and malfunctions in both the canister pump module and purge VSV, based on the EVAP pressure.

HINT
*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the engine switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the engine switch is turned off, the monitor check starts 2.5 hours later.

2. Purge flow monitor

The purge flow monitor consists of the 2 monitors. The 1st monitor is conducted every time and the 2nd monitor is conducted if necessary.

The 1st monitor

While the engine is running and the purge Vacuum Switching Valve (VSV) is ON (open), the ECM monitors the purge flow by measuring the EVAP pressure change. If negative pressure is not created, the ECM begins the 2nd monitor.

The 2nd monitor

The vent valve turned OFF (open) and the EVAP pressure is then measured. If the variation in the pressure is less than 0.4 kPa (3 mmHg), the ECM interprets this as the purge VSV being stuck closed, and illuminates the MIL and sets DTC P0441 (2 trip detection logic).

* Atmospheric pressure check:

* In order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before and after conduction of the purge flow monitor, is measured by the ECM.

















WIRING DIAGRAM

Refer to DTC P0451 P0451.

INSPECTION PROCEDURE

NOTICE:
Techstream is required to conduct the following diagnostic troubleshooting procedure.

HINT
* Using Techstream monitor results enable the EVAP system to be confirmed.
* Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.

PROCEDURE

1. CONFIRM DTC

(a) Turn the engine switch off and wait for 10 seconds.

(b) Turn the engine switch on (IG).

(c) Turn the engine switch off and wait for 10 seconds.

(d) Connect Techstream to the DLC3.

(e) Turn the engine switch on (IG).

(f) Enter the following menus: Powertrain / Engine / Trouble Codes.

(g) Confirm DTCs and freeze frame data.

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

NOTICE:
If the reference pressure difference between the first and second checks is greater than the specification, all the DTCs corresponding to the reference pressure (P043E, P043F, P2401, P2402 and P2419) will all be stored.





NEXT -- Continue to next step.

2. PERFORM EVAP SYSTEM CHECK (AUTOMATIC MODE)

NOTICE:
* In the Evaporative System Check (Automatic Mode), the series of 5 steps are performed automatically by the Techstream. 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 during this operation.
* 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).

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs DTC Check / Clear.

(e) Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode.

(f) 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 -- Continue to next step.

3. PERFORM EVAP SYSTEM CHECK (MANUAL MODE)





NOTICE:
* In the Evaporative System Check (Manual Mode), perform the series of 5 Evaporative System Check steps manually using the Techstream.
* 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).

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs DTC Check / Clear.

(e) Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Manual Mode.

NEXT -- Continue to next step.

4. PERFORM EVAP SYSTEM CHECK (STEP 1/5)





(a) Check the EVAP pressure in step 1/5.

Result:





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

B -- REPLACE CANISTER
A -- Continue to next step.

5. PERFORM EVAP SYSTEM CHECK (STEP 1/5 TO 2/5)





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

Result:





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

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

B -- PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VACUUM PUMP)
A -- Continue to next step.

6. PERFORM EVAP SYSTEM CHECK (STEP 2/5)





HINT
Make a note of the pressures checked in the 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 is proceeded to step 2/5 (Step B).

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

Result:





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

D -- INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION)

C -- REPLACE CANISTER

B -- PERFORM EVAP SYSTEM CHECK (STEP 3/5)
A -- Continue to next step.

7. PERFORM EVAP SYSTEM CHECK (STEP 2/5 TO 3/5)





(a) Check the EVAP pressure in step 3/5.

Result:





*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the step 1 "Confirm DTC".

C -- REPLACE CANISTER

B -- INSPECT CANISTER ASSEMBLY (POWER SOURCE FOR VENT VALVE)
A -- Continue to next step.

8. PERFORM EVAP SYSTEM CHECK (STEP 3/5)





(a) Wait until the EVAP pressure change is less than 0.1 kPa (0.75 mmHg) for 30 seconds.

(b) 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 -- Continue to next step.

9. PERFORM EVAP SYSTEM CHECK (STEP 4/5)





(a) Check the EVAP pressure in step 4/5.

Result:





*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the step 1 "Confirm DTC".

C -- PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)

B -- CHECK EVAP HOSE (PURGE VSV - INTAKE MANIFOLD)
A -- Continue to next step.

10. PERFORM EVAP SYSTEM CHECK (STEP 5/5)





(a) Check the EVAP pressure in step 5/5.

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

Result:





*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the step 1 "Confirm DTC".

B -- PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)

A -- REPAIR OR REPLACE PARTS AND COMPONENTS INDICATED BY OUTPUT DTCS
C -- Continue to next step.

11. PERFORM EVAP SYSTEM CHECK (STEP 3/5)





(a) Check the EVAP pressure in step 3/5.

Result:





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

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

B -- PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VACUUM PUMP)

A -- REPLACE CANISTER

12. PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)

(a) Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for EVAP Control.





(b) Disconnect the hose (connected to the canister) from the purge VSV.

(c) Start the engine.

(d) Using the Techstream, turn off the purge VSV (Activate the VSV for EVAP Control: OFF).

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

(f) Using the Techstream, turn on the purge VSV (Activate the VSV for EVAP Control: ON).

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

Result:





(h) Reconnect the hose.

C -- CHECK EVAP HOSE (PURGE VSV - INTAKE MANIFOLD)

B -- INSPECT DUTY VACUUM SWITCHING VALVE (PURGE VSV)
A -- Continue to next step.

13. CHECK FUEL TANK CAP

(a) Check that the fuel tank cap is correctly installed and confirm that the fuel tank cap meets OEM specifications.

(b) Tighten the fuel tank cap until a few click sounds are 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 onto the fuel tank cap adaptor.

(2) 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.

(3) Seal the adaptor and wait for 2 minutes.

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

Result:





(c) Reinstall the fuel tank cap.

C -- REPLACE FUEL TANK CAP

B -- CORRECTLY REINSTALL OR REPLACE FUEL TANK CAP

A -- LOCATE EVAP LEAK PART

14. INSPECT DUTY VACUUM SWITCHING VALVE (PURGE VSV)

(a) Turn the engine switch off.





(b) Disconnect the E15 purge VSV connector.

(c) Disconnect the hose (connected to the canister) from the purge VSV.

(d) Start the engine.

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

Result:





(f) Reconnect the purge VSV connector.

(g) Reconnect the hose.

B -- REPLACE DUTY VACUUM SWITCHING VALVE (PURGE VSV)

A -- REPLACE ECM
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