Part 1

2GR-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: EVAP System
- EVAP System

DESCRIPTION

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

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

The ECM monitors the condition of both the key-off monitor and purge flow monitor to ensure proper operation of the EVAP system.

Text in Illustration

HINT
Standard atmospheric pressure is 101.3 kPa (760 mmHg-a)

Key-off Monitor

This monitoring system checks for canister pump module malfunctions and leaks from the EVAP and closed tank systems. Be sure to leave the vehicle for at least 5 hours to sufficiently cool the fuel and stabilize fuel tank pressure. This makes EVAP system monitoring more accurate.

HINT
If the engine coolant temperature is 50°C (122°F) or more, 5 hours after the ignition switch has been turned off, the ECM will begin performing a monitor check after another 2 hours. If the engine coolant temperature is still 50°C (122°F) or more, 7 hours after the ignition switch has been turned off, the ECM will begin performing a monitor check after another 2.5 hours.

There are two methods for monitoring the EVAP system.

* If the fuel tank pressure is higher or lower than the atmospheric pressure, the system determines that there are no leaks in the closed tank system and the system will check for leaks from the piping and canister between the purge VSV and canister pump module. (Method A)

* If the fuel tank pressure is almost the same as the atmospheric pressure, vacuum will be allowed to enter the fuel tank and the system will check for leaks from the fuel tank after checking for leaks from the canister. (Method B)

HINT
*: If there is only a small amount of fuel in the fuel tank, stabilizing the EVAP pressure takes longer than usual.

Text in Illustration

Purge Flow Monitor

If EVAP system pressure change is less than 7.5 mmHg (1 kPa) when the engine is running and the purge VSV is turned on (closed), the ECM determines that the purge flow is insufficient.

Text in Illustration

RELATED DTCS

MONITOR RESULT

Refer to Checking Monitor Status Mode 6 Data.

CONFIRMATION DRIVING PATTERN

1. KEY-OFF MONITOR DRIVE PATTERN

(a) Connect the Techstream to the DLC3.

(b) Put the engine in inspection mode Component Tests and General Diagnostics.

(c) Confirm the following conditions are satisfied:

* The fuel level is less than 90%.

* The altitude is less than 7874 ft. (2400 m).

* The vehicle is stopped (the vehicle speed is 0 mph (0 km/h)).

* The engine coolant temperature is 4.4 to 35°C (40 to 95°F)

* The intake air temperature is 4.4 to 35°C (40 to 95°F)

(d) Perform the following drive pattern:

(1) Allow the engine to idle for 5 minutes or more.

(2) Turn the ignition switch off and wait 5, 7, 9.5 hours.

(e) Check the monitor status with the Techstream.

2. PURGE FLOW MONITOR DRIVE PATTERN (P0441)

(a) Connect the Techstream to the DLC3.

(b) Put the engine in inspection mode Component Tests and General Diagnostics.

(c) Confirm that the following conditions are satisfied:

* The engine coolant temperature is more than 4.4°C (40°F).

* The intake air temperature is more than 4.4°C (40°F).

(d) Perform the following drive pattern:

(1) Remove and reinstall the fuel cap to release the fuel tank pressure.

(2) Warm the engine until the engine coolant temperature reaches 75°C (167°F) or more.

(3) Run the engine at 2500 rpm once.

(e) Check the monitor status with the Techstream.

WIRING DIAGRAM

INSPECTION PROCEDURE

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

PROCEDURE

1. CONFIRM DTC

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

(b) Turn the ignition switch to ON.

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

(d) Connect the Techstream to the DLC3.

(e) Turn the ignition switch to ON and turn the Techstream on.

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

(g) Confirm the DTCs and freeze frame data.

EVAP Related DTCs

DTC and Malfunction Cross-Reference

NEXT -- Continue to next step.

2. PERFORM EVAPORATIVE SYSTEM CHECK (AUTOMATIC MODE)

NOTICE:
* In the Evaporative System Check (Automatic Mode), a series of 9 Evaporative System Check steps are performed automatically. A maximum of 15 minutes is required.
* Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed and the leak check of the fuel tank is impossible.
* Do not run the engine.
* 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).

(a) Clear the DTCs with the Techstream.

(b) Remove the fuel tank cap and reinstall the fuel cap.

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

(d) After the Evaporative System Check is completed, check for pending DTCs.

Result:

C -- END

B -- PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE)
A -- Continue to next step.

3. IDENTIFY TROUBLE AREAS USING DTC

(a) Refer to the table below to determine the next procedure according to the output DTCs.

Result:

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

C -- CHECK CANISTER PUMP MODULE (VENT VALVE POWER SOURCE CIRCUIT)

B -- CHECK CANISTER PUMP MODULE (VACUUM PUMP POWER SOURCE CIRCUIT)
A -- Continue to next step.

4. IDENTIFY TROUBLE AREAS USING DTC

(a) Refer to the table below to determine the next procedure according to the output DTCs.

Result:

D -- CHECK FUEL VAPOR-CONTAINMENT VALVE ASSEMBLY (POWER SOURCE CIRCUIT)

C -- CHECK FUEL TANK CAP ASSEMBLY

B -- CHECK CANISTER PUMP MODULE (VENT VALVE POWER SOURCE CIRCUIT)
A -- Continue to next step.

5. CHECK VACUUM HOSE (PURGE VSV - THROTTLE WITH MOTOR BODY ASSEMBLY)

(a) Disconnect the hose (to the intake air connector) from the purge VSV.

(b) Start the engine.

(c) Use your finger and confirm that the purge VSV has suction.

Text in Illustration

Result:

(d) Reconnect the hose.

NG -- REPAIR OR REPLACE VACUUM HOSE (PURGE VSV - THROTTLE WITH MOTOR BODY ASSEMBLY)
OK -- Continue to next step.

6. PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)

(a) Enter the following menus: Powertrain / Engine and ECT / Active Test / Active 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 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.

B -- CHECK HOSES (PURGE VSV - CANISTER)
A -- Continue to next step.

7. CHECK PURGE VSV

(a) Remove the purge VSV.

(b) Apply compressed air to the purge VSV, and confirm that no air flows from A to B as shown in the illustration.

(c) Apply battery voltage to the purge VSV.

(d) While applying compressed air, confirm that air flows from A to B as shown in the illustration.

Text in Illustration

Result:

(e) Reinstall the purge VSV.

NG -- REPLACE PURGE VSV
OK -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (PURGE VSV - EFI NO. 2 FUSE)

(a) Disconnect the purge VSV connector.

(b) Turn the ignition switch to ON.

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

Text in Illustration

Result:

(d) Reconnect the connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

(a) Disconnect the ECM connector and the purge VSV connector.

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

Standard Resistance:

Text in Illustration

(c) Reconnect the connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

10. REPLACE ECM

(a) Replace the ECM Removal.

NEXT -- PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)

11. CHECK CANISTER PUMP MODULE (VACUUM PUMP POWER SOURCE CIRCUIT)

(a) Turn the ignition switch off.

(b) Remove the canister lower cover.

(c) Disconnect the canister pump module connector.

(d) Connect the Techstream to the DLC3.

(e) Turn the ignition switch to ON.

(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump.

(g) Turn the vacuum pump on using the Techstream.

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

Text in Illustration

Standard Voltage:

Result:

(i) Reconnect the connector.

(j) Reinstall the canister lower cover.

B -- CHECK CANISTER PUMP MODULE (VENT VALVE POWER SOURCE CIRCUIT)
A -- Continue to next step.

12. CHECK HARNESS AND CONNECTOR (VACUUM PUMP - BODY GROUND)

(a) Disconnect the canister pump module connector.

(b) Turn the ignition switch off.

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

Standard Resistance:

Text in Illustration

(d) Reconnect the connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

13. CHECK HARNESS AND CONNECTOR (VACUUM PUMP - ECM)

(a) Disconnect the ECM connector.

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

Standard Resistance:

Text in Illustration

(c) Connect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

14. REPLACE ECM

(a) Replace the ECM Removal.

NEXT -- PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)

15. CHECK CANISTER PUMP MODULE (VENT VALVE POWER SOURCE CIRCUIT)

(a) Turn the ignition switch off.

(b) Remove the canister lower cover.

(c) Disconnect the canister pump module connector.

Standard Voltage:

Result:

(i) Reconnect the connector.

(j) Reinstall the canister lower cover.

B -- CHECK HARNESS AND CONNECTOR (VENT VALVE - ECM)
A -- Continue to next step.

16. INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION)

(a) Turn the ignition switch off.

(b) Remove the canister lower cover.

(c) Disconnect the canister pump module connector.

(d) Apply battery voltage to VLVB and VGND terminals of the canister pump module.

(e) Touch the canister pump module to confirm the vent valve operation.

Text in Illustration

Result:

(f) Reconnect the connector.

(g) Reinstall the canister lower cover.

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

17. CHECK HARNESS AND CONNECTOR (VENT VALVE - ECM)

(a) Disconnect the ECM connector.

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

Standard Resistance:

Text in Illustration

(c) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

18. REPLACE ECM

(a) Replace the ECM Removal.

NEXT -- PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)

19. CHECK HOSES (PURGE VSV - CANISTER)

(a) Remove the canister lower cover.

(b) Connect the pressure gauge to the canister pump module with the adapter.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Fuel Vapor-Containment Valve.

(f) Turn the fuel vapor-containment valve ON using the Techstream.

(g) Pressurize the EVAP system to between 3.2 and 3.7 kPa-g (24 and 28 mmHg-g).

NOTICE:
More than 4.7 kPa-g (35 mmHg-g) of pressure will damage the EVAP system. Pay attention to the pressure.

(h) Apply soapy water to the piping and connections of the EVAP system. Look for the area where bubbles appear.

HINT
* If the system has leaks, a whistling sound will be heard.
* Disconnect the hose between the canister and fuel tank from the canister. Close the canister on the area where the hose was connected and perform an inspection. The fuel tank and fuel vapor containment valve can be eliminated from the suspected areas for leak checks.

(i) Reinstall the canister lower cover.

NEXT -- Continue to next step.

20. REPLACE MALFUNCTIONING PART

NEXT -- PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)