Part 2

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: EVAP System
- EVAP System - Continued

WIRING DIAGRAM

Refer to DTC P0451 P0451.

INSPECTION PROCEDURE

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

HINT
* Using the Techstream monitor results enables the EVAP (Evaporative Emission) system to be confirmed.
* Read freeze frame data using the 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.

PROCEDURE

1. CONFIRM DTC

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

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

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

(d) Connect the Techstream to the DLC3.

(e) Turn the ignition switch on (IG) and turn the tester on.

(f) Select the following menus: Powertrain / Engine and ECT / 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 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.

NEXT -- Continue to next step.

2. PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)

NOTICE:
* In the Evaporative System Check (Automatic Mode) series of 5 steps is 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 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) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Select the following menu items on the tester: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.

(d) 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 DTC is displayed, perform the Monitor Confirmation after this 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 OPERATION)

NOTICE:
* In the Evaporative System Check (Manual Mode), the series of 5 Evaporative System Check steps is performed manually by 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) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Select the following menu items: Powertrain / Engine and ECT / 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:

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

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

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

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

Result:

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

(a) Check the EVAP pressure 4 seconds after the vacuum pump is activated*1 (Step (a)).

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

*1: The vacuum pump begins to operate at the time step 2/5 starts.

Result:

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

D -- PERFORM ACTIVE TEST USING TECHSTREAM (FOR VENT VALVE)

C -- REPLACE CHARCOAL CANISTER ASSEMBLY

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 increase in step 3/5.

Result:

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

C -- REPLACE CHARCOAL CANISTER ASSEMBLY

B -- PERFORM ACTIVE TEST USING TECHSTREAM (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:

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

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

B -- CHECK EVAP HOSE (PURGE VSV - THROTTLE BODY)
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:

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

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

A -- REPAIR OR REPLACE PARTS AND COMPONENTS INDICATED BY OUTPUT DTCS

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 the Techstream when checking.

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

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

A -- REPLACE CHARCOAL CANISTER ASSEMBLY

12. PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)

(a) Select the following menu items on the tester: Powertrain / Engine and ECT / Active Test / Activate the VSV for EVAP Control.

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

Text in Illustration

(c) Start the engine.

(d) Using the tester, turn off the purge VSV (EVAP VSV: OFF).

(e) Confirm that the purge VSV has no suction with your fingers.

(f) Using the tester, turn on the purge VSV (EVAP VSV: ON).

(g) Confirm that the purge VSV has suction with your fingers.

Result:

(h) Reconnect the hose.

C -- CHECK EVAP HOSE (PURGE VSV - THROTTLE BODY)

B -- INSPECT PURGE VSV
A -- Continue to next step.

13. CHECK FUEL TANK CAP ASSEMBLY

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

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

(1) Tighten the fuel tank cap.

(2) Remove the fuel tank cap and install it onto the fuel tank cap adaptor.

(3) Connect the 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.

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

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