2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: EVAP System; 2006 MY LX470 [01/2006

Last Modified: 4-30-2014	6.6 J	Doc ID: RM000000YEQ018X
Model Year: 2006	Model: LX470	Prod Date Range: [01/2006 - ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: EVAP System; 2006 MY LX470 [01/2006 - ]

EVAP System

RELATED DTCS

DTC No.	Monitoring Item	See procedure
P043E	Reference orifice clogged (built into canister pump module)
P043F	Reference orifice high-flow (built into canister pump module)
P0441	Purge VSV stuck closed Purge VSV stuck open Purge flow
P0450	Canister pressure sensor (built into canister pump module) voltage abnormal fluctuation
P0451	Canister pressure sensor (built into canister pump module) noising Canister pressure sensor (built into canister pump module) signal becomes fixed/flat
P0452	Canister pressure sensor (built into canister pump module) voltage low
P0453	Canister pressure sensor (built into canister pump module) voltage high
P0455	EVAP gross leak
P0456	EVAP small leak
P2401	Leak detection pump stuck OFF (built into canister pump module)
P2402	Leak detection pump stuck ON (built into canister pump module)
P2419	Vent valve stuck closed (built into canister pump module)
P2420	Vent valve stuck open (vent) (built into canister pump module)
P2610	Soak timer (built into ECM)

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, the DTCs corresponding to the reference pressure (P043E, P043F, P2401, P2402 and P2419) will all be stored.

DESCRIPTION

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 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 Evaporative Emission (EVAP) system leaks and canister pump module malfunctions. The monitor starts 5 hours* after the ignition 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 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 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 0.5 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.

Component	Operation
Canister	Contains activated charcoal to absorb EVAP generated in fuel tank.
Cut-off valve	Located in fuel tank. Valve floats and closes when fuel tank 100% full.
Purge Vacuum Switching Valve (VSV)	Opens or closes line between canister and intake manifold. ECM uses purge VSV to control EVAP purge flow. In order to discharge EVAP absorbed by canister to intake manifold, ECM opens purge VSV. EVAP discharge volume to intake manifold controlled by purge VSV duty cycle ratio (current-carrying time) (open: ON, closed: OFF).
Refueling valve	Controls EVAP pressure from fuel tank to canister. Valve consists of diaphragm, spring and restrictor (diameter: 0.08 inch). When fuel vapor and pressure inside fuel tank increase, valve opens. While EVAP purged, valve closes and restrictor prevents large amount of vacuum from affecting pressure in fuel tank. Valve opens while refueling.
Roll-over valve	Located in fuel tank. Valve closes by its own weight when vehicle overturns to prevent fuel from spilling out.
Soak timer	Built into ECM. To ensure accurate EVAP monitor, measures 5 hours (+-15 min) after ignition switch OFF. This allows fuel to cool down, stabilizing Fuel Tank Pressure (FTP). When approximately 5 hours elapsed, ECM activates.
Canister pump module	Consists of (a) to (d) below. canister pump module cannot be disassembled.
(a) Vent valve	Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. When, ECM turns valve OFF, EVAP system vented. Negative pressure (vacuum) created in EVAP system to check for EVAP leaks by closing purge VSV, turning vent valve ON (closed) and operating leak detection pump (refer to fig. 1).
(b) Canister pressure sensor	Indicates pressure as voltage. ECM supplies regulated 5 V to canister pressure sensor, and uses feedback from sensor to monitor EVAP system pressure (refer to fig. 2).
(c) Leak detection pump	Creates negative pressure (vacuum) in EVAP system for leak check.
(d) Reference orifice	Has opening with 0.02 inch diameter. Vacuum produced through orifice by closing purge VSV, turning vent valve OFF and operating leak detection pump, to monitor reference pressure. Reference pressure indicates small leak of EVAP.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

The intelligent tester is required to conduct the following diagnostic troubleshooting procedure.

HINT:

Using the intelligent tester monitor results enable the EVAP system to be confirmed.
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions 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 ON.

(d) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(e) Turn the ignition switch ON.

(f) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT 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:

2.	PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)

NOTICE:

In the EVAP SYSTEM CHECK (AUTO OPERATION), the series of 5 EVAP SYSTEM CHECK steps are performed automatically. It takes a maximum of approximately 18 minutes.
Do not perform the EVAP 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 not possible.
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 EVAP SYSTEM CHECK, keep the temperature below 35°C (95°F).

(a) Clear the DTCs .

(b) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / EVAP SYS CHECK / AUTO OPERATION.

(c) After the EVAP SYSTEM CHECK is completed, check for pending DTCs by entering the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

HINT:

If no pending DTCs are displayed, perform the MONITOR CONFIRMATION (see "Diagnostic Help" menu). After this confirmation, check for pending DTCs. If no DTCs are displayed, the EVAP system is normal.

3.	PERFORM EVAP SYSTEM CHECK (MANUAL OPERATION)

NOTICE:

In the EVAP SYSTEM CHECK (MANUAL OPERATION), the series of 5 EVAP SYSTEM CHECK steps are performed manually.
Do not perform the EVAP 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 not possible.
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 EVAP SYSTEM CHECK, keep the temperature below 35°C (95°F).

(a) Clear the DTCs .

(b) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / EVAP SYS CHECK / MANUAL OPERATION.

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

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

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	Virtually no variation in EVAP pressure	Not yet determined	A
P0451	EVAP pressure fluctuates by +-0.3 kPa-g (2.25 mmHg-g) or more	Canister pressure sensor noising	B

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

GO TO STEP 30

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

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

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	Virtually no variation in EVAP pressure during step 1/5. Then decreases to reference pressure	Not yet determined	A
P2402	Small difference between EVAP pressures during steps 1/5 and 2/5	Leak detection pump stuck ON	B

*: 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.

GO TO STEP 23

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

HINT:

Make a note of the pressures checked in the steps 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 proceeds to step 2/5.
(b) Check the EVAP pressure again when it has stabilized. This pressure is the reference pressure.

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure in step (b) between -4.85 kPa-g and -1.057 kPa-g (-36.4 mmHg-g and -7.93 mmHg-g)	Not yet determined	A
P043F and P2401	EVAP pressure in step (b) -1.057 kPa-g (-7.93 mmHg-g) or more	Reference orifice high-flow Leak detection pump stuck OFF	B
P043E	EVAP pressure in step (b) below -4.85 kPa-g (- 36.4 mmHg-g)	Reference orifice clogged	C
P2419	EVAP pressure in step (a) more than -1.057 kPa-g (-7.93 mmHg-g)	Vent valve stuck closed	D

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

GO TO STEP 11

GO TO STEP 30

GO TO STEP 19

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

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

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 2/5 to step 3/5	Not yet determined	A
P2420	No variation in EVAP pressure despite proceeding from step 2/5 to step 3/5	Vent valve stuck open (vent)	B
P0451	No variation in EVAP pressure during steps 1/5 through 3/5	Canister pressure sensor malfunction fixed	C

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

GO TO STEP 20

GO TO STEP 30

8.	PERFORM EVAP 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 saturated. When there is little fuel in the fuel tank, it takes up to 15 minutes.

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

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

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 3/5 to step 4/5	Not yet determined (no leakage from EVAP system)	A
P0441	EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 3/5 to step 4/5	Problems in EVAP hose between purge VSV and intake manifold	B
P0441	Variation in EVAP pressure less than 0.3 kPa-g (2.25 mmHg-g) for 10 seconds, after proceeding from step 3/5 to step 4/5	Purge VSV stuck closed	C

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

GO TO STEP 15

GO TO STEP 12

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 (step 5/5).

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure (step 3/5) lower than second reference pressure (step 5/5)	Not yet determined	A
P0441 and P0455	EVAP pressure (step 3/5) higher than [second reference pressure (step 5/5) x 0.2]	Purge VSV stuck open EVAP gross leak	B
P0456	EVAP pressure (step 3/5) higher than second reference pressure (step 5/5)	EVAP small leak	C

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

GO TO STEP 36

GO TO STEP 12

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

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

DTC No. *	Test Result	Suspected Trouble Area	Proceed to
P043F	EVAP pressure less than [reference pressure] measured at 2/5	Reference orifice high-flow	A
P2401	EVAP pressure almost same as [reference pressure] measured at 2/5	Leak detection pump stuck OFF	B

*: 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.

GO TO STEP 30

GO TO STEP 23

12.	PERFORM ACTIVE TEST USING INTELLIGENT TESTER (PURGE VSV)

(a) On the intelligent tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / EVAP VSV.

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

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

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

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

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

Test Result	Suspected Trouble Area	Proceed to
No suction when purge VSV turned OFF, and suction applied when turned ON	Purge VSV normal	A
Suction applied when purge VSV turned OFF	Purge VSV stuck open	B
No suction when purge VSV turned ON	Purge VSV stuck closed Problems with EVAP hose between purge VSV and intake manifold	C

GO TO STEP 14

GO TO STEP 15

13.	CHECK FUEL CAP

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

(1) Tighten the fuel cap until a few click sounds are heard.

HINT:

If an EVAP tester is available, use the tester to check the fuel cap.

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

(c) 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.

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

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

Test Result	Suspected Trouble Area	Proceed to
Fuel cap correctly installed	-	A
Fuel cap loose	Fuel cap improperly installed Defective fuel cap Fuel cap does not meet OEM specifications	B
No fuel cap	-	C

GO TO STEP 29

GO TO STEP 27

GO TO STEP 28

14.	INSPECT PURGE VSV

(a) Turn the ignition switch OFF.

(b) Disconnect the V4 purge VSV connector.

(d) Start the engine.

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

Test Result	Suspected Trouble Area	Proceed to
No suction	ECM	A
Suction applied	Purge VSV	B

GO TO STEP 35

GO TO STEP 31

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.

Test Result	Suspected Trouble Area	Proceed to
Suction applied	EVAP hose between purge VSV and intake manifold normal	A
No suction	Intake manifold port EVAP hose between purge VSV and intake manifold	B

GO TO STEP 26

16.	INSPECT DUTY PURGE VSV

(a) Remove the purge VSV connector.

(b) Apply battery voltage to the terminals of the purge VSV.

Test Result	Suspected Trouble Area	Proceed to
Air flows	Purge VSV normal	A
No air flows	Purge VSV	B

GO TO STEP 31

17.	CHECK HARNESS AND CONNECTOR (POWER SOURCE OF PURGE VSV)

(a) Disconnect the V4 purge VSV connector.

(b) Turn the ignition switch ON.

Test Result	Suspected Trouble Area	Proceed to
9 to 14 V	Normal	A
Other than result above	Wire harness or connectors between purge VSV and ECM	B

GO TO STEP 32

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

(a) Disconnect the V4 purge VSV connector.

(b) Disconnect the E8 ECM connector.

Standard resistance:

Tester Connection	Specified Condition
V4-1 - E8-34 (PRG)	Below 1 Ω
V4-1 or E8-34 (PRG) - Body ground	10 kΩ or higher

GO TO STEP 35

GO TO STEP 32

19.	PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FOR VENT VALVE)

(a) Turn the ignition switch ON.

(b) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VENT VALVE (ALONE).

(c) Measure the voltage between terminal VPMP (E10-5) of the ECM connector and the body ground when the vent valve is turned ON (close) and OFF (vent) using the tester.

Test Result

Suspected Trouble Area

Proceed to

9 to 14 V when OFF

Below 3 V when ON

Vent valve

Below 3 V when OFF and ON

ECM

GO TO STEP 22

GO TO STEP 35

20.	PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FOR VENT VALVE)

(a) Turn the ignition switch ON.

(b) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VENT VALVE (ALONE).

(c) Measure the voltage between terminal VPMP (E10-5) of the ECM connector and the body ground when the vent valve is turned ON (close) and OFF (vent) using the tester.

Test Result

Suspected Trouble Area

Proceed to

Below 3 V when OFF and ON

Power source of vent valve

9 to 14 V when OFF

Below 3 V when ON

Vent valve

9 to 14 V when OFF and ON

ECM

GO TO STEP 22

GO TO STEP 35

21.	INSPECT CANISTER PUMP MODULE (POWER SOURCE FOR VENT VALVE)

(a) Turn the ignition switch OFF.

(b) Disconnect the L4 canister connector.

(d) Measure the voltage between +B terminal 9 of the canister connector and the body ground.

Test Result	Suspected Trouble Area	Proceed to
9 to 14 V	Normal	A
0 to 3 V	Power source wire harness of vent valve	B

GO TO STEP 32

22.	INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION)

(a) Turn the ignition switch OFF.

(b) Disconnect the L4 canister connector.

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

Test Result	Suspected Trouble Area	Proceed to
Operating	Wire harness between vent valve and ECM	A
Not operating	Vent valve	B

GO TO STEP 32

GO TO STEP 30

23.	PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FOR CANISTER PUMP MODULE [LEAK DETECTION PUMP])

(a) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VACUUM PUMP (ALONE).

(b) Measure the voltage between MPMP (E10-6) terminal of the ECM connector and the body ground when the leak detection pump is turned ON and OFF using the tester.

Test Result

Suspected Trouble Area

Proceed to

0 to 3 V when OFF

9 to 14 V when ON

ECM normal

9 to 14 V when OFF

0 to 3 V when ON

ECM

GO TO STEP 35

24.	CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

(a) Turn the ignition switch OFF.

(b) Disconnect the L4 canister connector.

(d) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VACUUM PUMP (ALONE).

(e) Turn the leak detection pump ON.

(f) Measure the voltage between +B terminal 1 of the canister pump module connector and the body ground when the leak detection pump is turned ON and OFF using the tester.

Test Result	Suspected Trouble Area	Proceed to
9 to14 V	Normal	A
0 to 3 V	Wire harness between ECM and leak detection pump	B

GO TO STEP 32

25.	CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - GROUND)

(a) Turn the ignition switch OFF.

(b) Disconnect the L4 canister connector.

(c) Measure the resistance of the wire harness side connectors between GND terminal 6 of the canister connector and the body ground.

Test Result	Suspected Trouble Area	Proceed to
Below 1 Ω	Leak detection pump	A
10 kΩ or higher	Wire harness between leak detection pump and body ground	B

GO TO STEP 30

GO TO STEP 32

26.	INSPECT INTAKE MANIFOLD (EVAP PURGE PORT)

(a) Turn the ignition switch OFF.

(b) Disconnect the EVAP hose from the intake manifold.

(d) Use your finger to confirm that the port of the intake manifold has suction.

Test Result	Suspected Trouble Area	Proceed to
Suction applied	EVAP hose between intake manifold and purge VSV	A
No suction	Intake manifold	B

GO TO STEP 33

GO TO STEP 34

27.	CORRECTLY REINSTALL OR REPLACE FUEL CAP

HINT:

When reinstalling the fuel cap, tighten it until a few click sounds are heard.
When replacing the fuel cap, use a fuel cap that meets OEM specifications, and tighten it until a few click sounds are heard.

GO TO STEP 37

28.	REPLACE FUEL CAP

HINT:

When installing the fuel cap, tighten it until a few click sounds are heard.

GO TO STEP 37

29.	LOCATE EVAP LEAK PART

(a) Disconnect the vent hose.

(b) Connect the EVAP pressure tester tool to the vent hose with the adapter.

(d) Apply soapy water to the piping and connecting parts of the EVAP system.

(e) Look for areas where bubbles appear. This indicates the leak point.

(f) Repair or replace the leak point.

HINT:

Disconnect the hose between the canister and the fuel tank from the canister. Block the canister side and conduct an inspection. In this way, the fuel tank can be excluded as an area suspected of causing fuel leaks.

GO TO STEP 37

30.	REPLACE CANISTER ASSEMBLY

(a) Replace the canister assembly .

NOTICE:

When replacing the canister, check the canister pump module interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose.

GO TO STEP 37

31.	REPLACE DUTY PURGE VSV

(a) Disconnect the connector and hoses from the purge VSV.

(b) Remove the purge VSV.

(d) Reconnect the connector and hose.

GO TO STEP 37

32.	REPAIR OR REPLACE HARNESS AND CONNECTOR

GO TO STEP 37

33.	REPLACE EVAP HOSE (INTAKE MANIFOLD - PURGE VSV)

GO TO STEP 37

34.	INSPECT INTAKE MANIFOLD (EVAP PURGE PORT)

(a) Check that the EVAP purge port of the intake manifold is not clogged. If necessary, replace the intake manifold.

GO TO STEP 37

35.	REPLACE ECM

(a) Replace ECM .

GO TO STEP 37

36.	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.

GO TO STEP 37

37.	PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)

NOTICE:

In the EVAP SYSTEM CHECK (AUTO OPERATION), the series of 5 EVAP SYSTEM CHECK steps are performed automatically. It takes a maximum of approximately 18 minutes.
Do not perform the EVAP 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 not possible.
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 EVAP SYSTEM CHECK, keep the temperature below 35°C (95°F).

(a) Clear the DTCs .

(b) On the intelligent tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / EVAP SYS CHECK / AUTO OPERATION.

(c) After the SYSTEM CHECK is completed, check for pending DTCs by entering the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

HINT:

If no pending DTC is found, the repair has been successfully completed.

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 freeway)
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 to 35°C (40 to 95°F)
The Intake Air Temperature (IAT) is between 4.4 to 35°C (40 to 95°F)
The vehicle remains stationary (the vehicle speed is 0 mph [0 km/h])

(b) Monitor Conditions

Allow the engine to idle for at least 5 minutes.
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.

Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the ignition switch ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / MONITOR STATUS.
Check the Monitor Status displayed on the tester.
HINT:

If INCMP is displayed, the monitor is not completed. 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 COMPL (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 freeway)
The ECT is between 4.4 to 35°C (40 to 95°F)
The IAT is between 4.4 to 35°C (40 to 95°F)

(b) Monitor Conditions

Release the pressure from the fuel tank by removing and reinstalling the fuel cap.
Warm the engine up until the ECT reaches more than 75°C (167°F).
Increase the engine speed to 3,000 rpm once.
Allow the engine to idle and turn the A/C ON for 1 minute.

Turn the ignition switch OFF (where ON or the engine is running).
Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the ignition switch ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / MONITOR STATUS.
Check the Monitor Status displayed on the tester.
HINT:

If INCMP is displayed, the monitor is not completed. Make sure that the preconditions have been met, and perform the "Monitor Conditions" procedures again.

MONITOR RESULT

Refer to detailed information .

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:

Monitor Identification Data (MID) is assigned to each emissions-related component.
Test Identification Data (TID) 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

MID	TID	Scaling	Unit	Description
$3D	$C9	Multiply by 0.001	kPa	Test value for small leak (P0456) Refer to pressure D ^*
$3D	$CA	Multiply by 0.001	kPa	Test value for gross leak (P0455) Refer to pressure E ^*
$3D	$CB	Multiply by 0.001	kPa	Test value for leak detection pump stuck OFF (P2401) Refer to pressure A ^*
$3D	$CD	Multiply by 0.001	kPa	Test value for leak detection pump stuck ON (P2402) Refer to pressure A ^*
$3D	$CE	Multiply by 0.001	kPa	Test value for vent valve stuck OFF (vent) (P2420) Refer to pressure C ^*
$3D	$CF	Multiply by 0.001	kPa	Test value for vent valve stuck ON (P2419) Refer to pressure A ^*
$3D	$D0	Multiply by 0.001	kPa	Test value for reference orifice low flow (P043E) Refer to pressure B ^*
$3D	$D1	Multiply by 0.001	kPa	Test value for reference orifice high flow (P043F) Refer to pressure A ^*
$3D	$D4	Multiply by 0.001	kPa	Test value for purge VSV stuck closed (P0441) Refer to pressure F ^*
$3D	$D5	Multiply by 0.001	kPa	Test value for purge VSV stuck open (P0441) Refer to pressure E ^*
$3D	$D7	Multiply by 0.001	kPa	Test value for purge flow insufficient (P0441) Refer to pressure G ^*

*: Pressures A to G are indicated in the following diagram.