Es

Purge VSV

Vent Valve

Leak Detection Pump

EVAP Pressure Positive

Negative

0.02 Inch Leak Criterion

Steps Time (Reference)

Vent Valve Stuck

Vent Valve Stuck

Within 15 minutes

ON: Open

OFF: Closed ON: Closed

OFF: Vent

Result

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

DTCs*

Test Results

Suspected Trouble Areas

Proceed To

-

EVAP pressure increases by 0.3 kPa (2.25 mmHg) 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 stuck

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

PERFORM EVAP SYSTEM CHECK (STEP 3/5)

Purge VSV

Vent Valve

Leak Detection Pump

EVAP Pressure Positive

ON: Open

OFF: Closed ON: Closed

OFF: Vent

Negative

0.02 Inch Leak Criterion

Steps Time (Reference)

3/5

Within 15 minutes

(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 (900 seconds).

PERFORM EVAP SYSTEM CHECK (STEP 4/5)

Purge VSV

Vent Valve

Leak Detection Pump

EVAP Pressure Positive i

Negative

0.02 Inch Leak Criterion

Steps Time (Second) (Reference)

ON: Open

ON

OFF: Closed ON: Closed

ON

OFF: Vent

ON

\

I

Purge VSV Stuck Closed Purge VSV Stuck Closed

4/5

10

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

DTCs*

Test Results

Suspected Trouble Areas

Proceed To

-

EVAP pressure increases by 0.3 kPa (2.25 mmHg) or more within 10 seconds of proceeding from step 3/5 to step 4/5

Not yet determined

A

P0441

EVAP pressure increases by 0.3 kPa (2.25 mmHg) or more within 10 seconds of proceeding from step 3/5 to step 4/5

Problems in EVAP hose between pure VSV and intake manifold

B

P0441

Variation in EVAP pressure less than 0.3 kPa (2.25 mmHg) 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

PERFORM EVAP SYSTEM CHECK (STEP 5/5)

Purge VSV

Vent Valve

Leak Detection Pump

EVAP Pressure Positive k

Purge VSV

Vent Valve

Leak Detection Pump

EVAP Pressure Positive k

Negative

0.02 Inch Leak Criterion

Steps

Time (Second) (Reference)

ON: Open

ON

OFF: Closed ON: Closed

ON

OFF: Vent

ON

Gross Leak

/ X / / / / / / / / / /

[Second 0.02 Inch Leak

V

Small Leak

1 / /

Second 0.02 Inch Leak Criterion

No Leak

5/5

60

0.02 Inch Leak Criterion

Steps

Time (Second) (Reference)

(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 criterion (step 5/5).

Result

DTCs*

Test Results

Suspected Trouble Areas

Proceed To

-

EVAP pressure (step 3/5) lower than second 0.02 inch leak criterion (step 5/5)

Not yet determined (no leakage from EVAP system)

A

P0441 and P0455

EVAP pressure (step 3/5) higher than [second 0.02 inch leak criterion (step 5/5) x 0.2]

• Purge VSV stuck open

• EVAP gross leak

B

P0456

EVAP pressure (step 3/5) higher than second 0.02 inch leak criterion (step 5/5)

EVAP small leak

B

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

Go to step 36

PERFORM EVAP SYSTEM CHECK (STEP 3/5)

Purge VSV

Vent Valve

Leak Detection Pump

EVAP Pressure Positive |

Negative

0.02 Inch Leak Criterion

Steps

Time (Reference)

Leak Detection Pump Stuck OFF

\ Reference Orifice v ^High-flow

Within 15 minutes

ON: Open

OFF: Closed ON: Closed

OFF: Vent

Result

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

Result

DTCs*

Test Results

Suspected Trouble Areas

Proceed To

P043F

EVAP pressure less than [0.02 inch leak criterion] measured at 2/5

Reference orifice high-flow

A

P2401

EVAP pressure almost same as [0.02 inch leak criterion] 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 0.02 inch leak criterion is the value determined in step 2/5.

Go to step 30

Go to step 23

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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