Part 1

1GR-FE ENGINE CONTROL: SFI SYSTEM: EVAP System
- EVAP System

RELATED DTCS

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

NOTICE:
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.

DESCRIPTION

Text in Illustration

NOTICE:
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 side of the canister exposed to the atmosphere.

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 into the intake manifold. The ECM changes the duty cycle of the purge VSV to control purge flow volume.

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

The following two monitors run to confirm the 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 which stabilizes 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 2 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 0.15 kPa-g (1.12 mmHg-g), the ECM interprets this as the purge VSV being stuck closed, illuminates the MIL and stores DTC P0441 (2 trip detection logic).

Atmospheric pressure check:

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

Text in Illustration

WIRING DIAGRAM

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 checked.
* Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. CONFIRM DTC

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

(b) Turn the ignition switch to ON.

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

(g) Confirm DTCs and freeze frame data.

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

NOTICE:
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.

NEXT -- Continue to next step.

2. PERFORM EVAPORATIVE SYSTEM CHECK (AUTO OPERATION)

NOTICE:
* The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 23 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 fuel tank leak check unavailable.
* Do not run the engine during this operation.
* When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

(a) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Enter the following menus: 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 menus: Powertrain / Engine and ECT / Trouble Code / 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 -- Continue to next step.

3. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL OPERATION)

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 fuel tank leak check unavailable.
* Do not run the engine during this operation.
* When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

(a) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.

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

NEXT -- Continue to next step.

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

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

Result

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

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

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

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

Result

*: 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 -- PERFORM ACTIVE TEST USING TECHSTREAM (VACUUM PUMP (ALONE))
A -- Continue to next step.

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

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

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

B -- PERFORM EVAPORATIVE SYSTEM CHECK (STEP 3/5)

C -- REPLACE CANISTER ASSEMBLY

D -- INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION)
A -- Continue to next step.

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

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

Result

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

B -- INSPECT CANISTER PUMP MODULE (POWER SOURCE FOR VENT VALVE)

C -- REPLACE CANISTER ASSEMBLY
A -- Continue to next step.

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

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

(b) 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 -- Continue to next step.

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

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

Result

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

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

C -- PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)
A -- Continue to next step.

10. PERFORM EVAPORATIVE 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 (step 5/5).

Result

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

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

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

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

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

Result

*: 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 -- REPLACE CANISTER ASSEMBLY

B -- PERFORM ACTIVE TEST USING TECHSTREAM (VACUUM PUMP (ALONE))

12. PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)

(a) Enter the following menus: 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) Using the Techstream, turn off the purge VSV (EVAP VSV: OFF).

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

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

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

Result

Text in Illustration

(h) Reconnect the hose.

B -- INSPECT PURGE VSV

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

13. CHECK FUEL TANK CAP ASSEMBLY

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

(b) Tighten the fuel tank cap assembly until a few click sounds are heard.

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

(a) Remove the fuel tank cap assembly and install it onto a fuel cap adapter.
(b) 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.
(c) Seal the adapter and wait for 2 minutes.
(d) Check the pressure. If the pressure is 2 kPa (15 mmHg) or higher, the fuel tank cap assembly is normal.

Result

(c) Reinstall the fuel tank cap assembly.

A -- LOCATE EVAP LEAK PART

B -- CORRECTLY REINSTALL OR REPLACE FUEL TANK CAP ASSEMBLY

C -- REPLACE FUEL TANK CAP ASSEMBLY

14. INSPECT PURGE VSV

(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

Text in Illustration

(f) Reconnect the purge VSV connector.

(g) Reconnect the hose.

A -- REPLACE ECM

B -- REPLACE PURGE VSV

15. CHECK EVAP HOSE (PURGE VSV - INTAKE MANIFOLD)

(a) Disconnect the hose (connected to the intake manifold) from the purge VSV.

(b) Start the engine.

(c) Use your finger to confirm that the hose has suction.

Result

Text in Illustration

(d) Reconnect the hose.

B -- INSPECT INTAKE MANIFOLD (EVAP PURGE PORT)
A -- Continue to next step.

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