EVAP System
1ZZ-FE 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.
NOTE: 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, P2420) will be all stored.
DESCRIPTION
NOTE: In this vehicle's EVAP system, turning ON the vent valve does not seal off the EVAP system. To check for leaks in the EVAP system, disconnect the air inlet vent hose and apply pressure from the atmospheric side of the canister.
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 two monitors run to confirm appropriate EVAP system operation.
1. Key-off monitor
This monitor checks for EVAP (Evaporative Emission) system leaks and canister pump module malfunctions. The monitor starts 5 hours* after the ignition switch is turned OFF. At least 5 hours are required for the fuel to cool down to stabilize the EVAP pressure, thus making the EVAP system monitor more accurate.
The 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 ignition 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 ignition switch is turned off, the monitor check starts 2.5 hours later.
2. Purge flow monitor
The purge flow monitor consists of the two monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.
- The 1st monitor
While the engine is running and the purge VSV (Vacuum Switching Valve) 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 is turned OFF (open) and the EVAP pressure is measured. If the variation in the pressure is less than 0.5 kPa-g (3.75 mmHg-g), 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
INSPECTION PROCEDURE
NOTE: Techstream is required to conduct the following diagnostic troubleshooting procedure.
HINT:
- Using Techstream monitor results enables the EVAP (Evaporative Emission) 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.
PROCEDURE
1. CONFIRM DTC
(a) Turn the ignition switch OFF and wait for 10 seconds.
(b) Turn the ignition switch to the ON position.
(c) Turn the ignition switch OFF and wait for 10 seconds.
(d) Connect Techstream to the DLC3.
(e) Turn the ignition switch to the ON position and press Techstream switch ON.
(f) Enter 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.
NOTE: If the 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), the series of 5 Evaporative System Check steps is performed automatically by 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 and 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) Clear the DTCs (DTC Check / Clear).
(b) On Techstream, select the following menu items: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
(c) 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 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 OPERATION)
NOTICE:
- In the Evaporative System Check (Manual Mode), the series of 5 Evaporative System Check steps is performed manually by 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) Clear the DTCs (DTC Check / Clear).
(b) On Techstream, 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 are displayed on 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 step 1/5 and 2/5.
Result:
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in step 1.
HINT: The first reference pressure is the value determined in step 2/5.
B -- PERFORM ACTIVE TEST BY TECHSTREAM (FOR PUMP MODULE (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 procedure "A" and "B" below.
(a) Check the EVAP pressure 4 seconds after the leak detection pump is activated* (Procedure "A").
(b) Check the EVAP pressure again when it has stabilized. This pressure is the reference pressure (Procedure "B").
*: The leak detection pump begins to operate as step 1/5 finishes and step 2/5 starts.
Result:
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in step 1.
D -- INSPECT PUMP MODULE (VENT VALVE OPERATION)
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 in step 3/5.
Result:
*:These DTCs are already present in the ECM when the vehicle arrives and are confirmed in step 1.
C -- REPLACE CHARCOAL CANISTER ASSEMBLY
B -- PERFORM ACTIVE TEST BY 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 Techstream when checking.
C -- PERFORM ACTIVE TEST BY 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 reference pressure standard (step 5/5).
Result:
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in step 1.
B -- PERFORM ACTIVE TEST BY 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:
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in step 1.
HINT: The first reference pressure is the value determined in step 2/5.
B -- PERFORM ACTIVE TEST BY TECHSTREAM (FOR PUMP MODULE (VACUUM PUMP))
A -- REPLACE CHARCOAL CANISTER ASSEMBLY
12. PERFORM ACTIVE TEST BY TECHSTREAM (PURGE VSV)
(a) On Techstream, select the following menu items: Powertrain / Engine and ECT / 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) On the tester, turn off the purge VSV (EVAP VSV: OFF).
(e) Use your finger to confirm that the purge VSV has no suction.
(f) Using the tester, turn on the purge VSV (EVAP VSV: ON).
(g) Use your finger to confirm that the purge VSV has suction.
Result:
(h) Reconnect the hose.
C -- CHECK EVAP HOSE (PURGE VSV - THROTTLE BODY)
B -- INSPECT VACUUM SWITCHING VALVE ASSEMBLY NO. 1
A -- Continue to next step.
13. CHECK FUEL TANK CAP ASSEMBLY
(a) Check that the fuel tank cap is correctly installed.
(b) Confirm that the fuel tank cap is tightened until a few click sounds are heard.
HINT: If an EVAP tester is available, check the fuel tank cap using the tester.
(1) Remove the fuel tank cap and install it onto a fuel tank cap adaptor.
(2) Connect an EVAP tester pump hose to the adaptor, and pressurize 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.
(5) Reinstall the fuel tank cap.
Result:
C -- REPLACE FUEL TANK CAP ASSEMBLY
B -- CORRECTLY REINSTALL OR REPLACE FUEL TANK CAP
A -- REPAIR EVAP LEAK PART
14. INSPECT VACUUM SWITCHING VALVE ASSEMBLY NO. 1
(a) Turn the ignition switch OFF.
(b) Disconnect the 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 VACUUM SWITCHING VALVE ASSEMBLY NO. 1 (PURGE VSV)
A -- REPLACE ECM
15. CHECK EVAP HOSE (PURGE VSV - THROTTLE BODY)
(a) Disconnect the hose (connected to the throttle body) from the purge VSV.
(b) Start the engine.
(c) Use your finger to confirm that the hose has suction.
Result:
(d) Reconnect the hose.
B -- INSPECT THROTTLE BODY ASSEMBLY
A -- Continue to next step.
16. INSPECT VACUUM SWITCHING VALVE ASSEMBLY NO. 1 (PURGE VSV)
(a) Remove the purge VSV.
(b) Apply battery voltage to the terminals of the purge VSV.
(c) Using an air gun, confirm that air flows from port A to port B.
Result:
(d) Install the purge VSV.
B -- REPLACE VACUUM SWITCHING VALVE ASSEMBLY NO. 1 (PURGE VSV)
A -- Continue to next step.
17. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF PURGE VSV)
(a) Disconnect the V3 Purge VSV connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage between terminal 1 of the V3 connector and the body ground.
Result:
(d) Reconnect the purge VSV connector.
B -- REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- Continue to next step.
18. CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)
(a) Disconnect the E3 ECM connector and the V3 purge VSV connector.
(b) Check the resistance.
Standard resistance:
(c) Reconnect the purge VSV connector.
(d) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE ECM
19. PERFORM ACTIVE TEST BY TECHSTREAM (FOR VENT VALVE)
(a) Turn the ignition switch to the ON position.
(b) On Techstream, select the following menu items: Powertrain / Engine and ECT / Active Test / Activate the VSV for EVAP System.
(c) Measure the voltage between terminal VPMP of the ECM connector and the body ground when the vent valve is turned ON (close) and OFF (vent) using the tester.
Result:
B -- REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- Continue to next step.
20. INSPECT PUMP MODULE (VENT VALVE OPERATION)
(a) Turn the ignition switch OFF.
(b) Disconnect the canister connector.
(c) Apply the battery voltage to terminals 9 and 8 of the pump module.
(d) Touch the pump module to confirm the vent valve operation.
Result:
(e) Reconnect the canister connector.
B -- REPLACE CHARCOAL CANISTER ASSEMBLY
A -- Continue to next step.
21. CHECK HARNESS AND CONNECTOR (ECM - CANISTER PUMP MODULE)
(a) Turn the ignition switch OFF.
(b) Disconnect the L5 canister connector and E3 ECM connector.
(c) Measure the resistance between terminal 8 of canister pump module connector and 27 of E3 ECM connector.
Result:
(d) Reconnect the ECM connector.
(e) Reconnect the canister pump module connector.
B -- REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- REPLACE ECM
22. PERFORM ACTIVE TEST BY TECHSTREAM (FOR PUMP MODULE (VACUUM PUMP))
(a) On Techstream, select the following menu items: Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump.
(b) Measure the voltage between MPMP terminal of ECM connector and the body ground when the vacuum pump is turned ON and OFF using the tester.
Result:
B -- CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM)
A -- Continue to next step.
23. CHECK HARNESS AND CONNECTOR (PUMP MODULE - GROUND)
(a) Disconnect the L5 canister connector.
(b) Turn the ignition switch OFF.
(c) Check the resistance between terminal 6 of the canister connector and the body ground.
Result:
(d) Reconnect the canister connector.
B -- REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- REPLACE CHARCOAL CANISTER ASSEMBLY
24. CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM)
(a) Turn the ignition switch OFF.
(b) Disconnect the L5 canister connector and E3 ECM connector.
(c) Measure the resistance between terminal 8 of canister pump module connector and 27 of E3 ECM connector.
Result:
(d) Reconnect the ECM connector.
(e) Reconnect the canister pump module connector.
B -- REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- REPLACE ECM
25. INSPECT THROTTLE BODY ASSEMBLY
(a) Stop the engine.
(b) Disconnect the EVAP hose from the throttle body.
(c) Start the engine.
(d) Use your finger to confirm that the port of the throttle body has suction.
Result:
(e) Reconnect the EVAP hose.
B -- INSPECT THROTTLE BODY ASSEMBLY
A -- REPLACE EVAP HOSE (THROTTLE BODY - PURGE VSV)
26. CORRECTLY REINSTALL OR REPLACE FUEL TANK CAP
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 tighten it until a few click sounds are heard.
NEXT -- PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)
27. REPLACE FUEL TANK CAP ASSEMBLY
HINT: When installing the fuel tank cap, tighten it until a few click sounds are heard.
NEXT -- PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)
28. REPAIR EVAP LEAK PART
(a) Disconnect the vent hose.
(b) Connect the EVAP pressure tester tool to the canister with the adapter.
(c) Pressurize the EVAP system by 3.2 to 3.7 kPa (24 to 28 mmHg).
(d) Apply soapy water to the piping and the connecting parts of the EVAP system.
(e) Look for areas where bubbles appear. This indicates leak point.
NEXT -- PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)
29. REPLACE CHARCOAL CANISTER ASSEMBLY
NEXT -- PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)
30. REPLACE VACUUM SWITCHING VALVE ASSEMBLY NO. 1 (PURGE VSV)
(a) Disconnect the connector and hoses from the purge VSV.
(b) Remove the purge VSV.
(c) Install a new purge VSV.
(d) Reconnect the connector and hoses.
NEXT -- PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)
31. REPAIR OR REPLACE HARNESS AND CONNECTOR
HINT: In case that the exhaust tail pipe is removed, go to the next step before installing it.
NEXT -- PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)
32. REPLACE EVAP HOSE (THROTTLE BODY - PURGE VSV)
NEXT -- PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)
33. INSPECT THROTTLE BODY ASSEMBLY
(a) Remove the throttle body (Removal).
(b) Check that there is no clog in the EVAP purge port of the throttle body. If necessary, replace the throttle body.
NEXT -- PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)
34. REPLACE ECM
(a) Replace the ECM (Removal).
NEXT -- PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)
35. REPAIR OR REPLACE PARTS AND COMPONENTS INDICATED BY OUTPUT DTCS
(a) Repair the malfunctioning areas indicated by the DTCs that had been confirmed when the vehicle was brought in.
NEXT -- Continue to next step.
36. PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)
NOTICE:
- In the Evaporative System Check (Automatic Mode), the series of 5 Evaporative System Check steps are performed automatically by 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 an Evaporative System Check, keep the temperature below 35°C (95°F).
(a) Clear the DTCs (DTC Check / Clear).
(b) On Techstream, select the following menu items: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
(c) 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 found, the repair has been successfully completed.
NEXT -- COMPLETED
CONFIRMATION DRIVING PATTERN
HINT: After a repair, check Monitor Status by performing the Key-Off Monitor Confirmation and Purge Flow Monitor Confirmation described below.
1. KEY-OFF MONITOR CONFIRMATION
(a) Preconditions
The monitor will not run unless:
- The vehicle has been driven for 10 minutes or more (in a city area or on a free way)
- The fuel tank is less than 90% full
- The altitude is less than 8,000 ft (2,400 m)
- The Engine Coolant Temperature (ECT) is between 4.4°C and 35°C (40°F and 95°F)
- The Intake Air Temperature (IAT) is between 4.4°C and 35°C (40°F and 95°F)
- The vehicle remains stationary (the vehicle speed is 0 mph [0 km/h])
(b) Monitor Conditions
1 Allow the engine to idle for at least 5 minutes.
2 Turn the ignition switch OFF and wait for 6 hours (8 or 10.5 hours).
HINT: Do not start the engine until checking Monitor Status. If the engine is started, the steps described above must be repeated.
(c) Monitor Status
1 Connect Techstream to the DLC3.
2 Turn the ignition switch to the ON position and turn the tester on.
3 Select the following menu items: Powertrain / Engine and ECT / Monitor / Evaporative System.
4 Check the Monitor Status displayed on the tester.
HINT: If INCMP is displayed, the monitor is not complete. Make sure that the preconditions have been met, and perform the Monitor Conditions again.
2. PURGE FLOW MONITOR CONFIRMATION (P0441)
HINT: Perform this monitor confirmation after the Key-Off Monitor Confirmation shows complete.
(a) Preconditions
The monitor will not run unless:
- The vehicle has been driven for 10 minutes or more (in a city area or on a free way)
- The ECT is between 4.4°C and 35°C (40°F and 95°F)
- The IAT is between 4.4°C and 35°C (40°F and 95°F)
(b) Monitor Conditions
1 Release the pressure from the fuel tank by removing and reinstalling the fuel cap.
2 Warm the engine up until the ECT reaches more than 75°C (167°F).
3 Increase the engine speed to 3,000 rpm once.
4 Allow the engine to idle and turn A/C ON for 1 minute.
(c) Monitor Status
1 Turn the ignition switch OFF (where ON or the engine is running).
2 Connect Techstream to the DLC3.
3 Turn the ignition switch to the ON position and turn the tester on.
4 Select the following menu items: Powertrain / Engine and ECT / Monitor / Evaporative System.
5 Check the Monitor Status displayed on the tester.
HINT: If INCMP is displayed, the monitor is not complete. Make sure that the preconditions have been met, and perform the Monitor Conditions again.
MONITOR RESULT
Refer to CHECKING MONITOR STATUS (Mode 6 Data).
The test value and test limit information are described in the following table. This information is included under MONITOR RESULT in the emissions-related DTC sections:
- MID (Monitor Identification Data) is assigned to each emissions-related component.
- TID (Test Identification Data) is assigned to each test value.
- Scaling is used to calculate the test value indicated on generic OBD II scan tools.
EVAP - Key-off Type
* Pressures A to G are indicated in the diagram below.
