Infiniti I30. Emission Control System (2003 year). Manual - part 36

SEF380Z

Overall Function Check

NHEC1108

Use this procedure to check the overall function of the EVAP can-
ister vent control valve circuit. During this check, a DTC might not
be confirmed.

WITH GST

NHEC1108S01

Disconnect hose from water separator.

Disconnect EVAP canister vent control valve harness connec-
tor.

Verify the following.

Condition

Air passage continuity

12V direct current supply between ter-
minals 1 and 2

No supply

Yes

If the result is NG, go to “Diagnostic Procedure”, EC-563.
If the result is OK, go to “Diagnostic Procedure” for DTC
P0442, EC-341.

IDX

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

Overall Function Check

EC-561

Wiring Diagram

NHEC1109

MEC553D

SEF668XC

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

Wiring Diagram

EC-562

Diagnostic Procedure

NHEC1110

CHECK RUBBER TUBE

1. Turn ignition switch “OFF”.
2. Disconnect rubber tube connected to EVAP canister vent control valve.
3. Check the rubber tube for clogging.

SEF267X

OK or NG

䊳

GO TO 2.

䊳

Clean rubber tube using an air blower.

CHECK EVAP CANISTER VENT CONTROL VALVE-I

1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion B of EVAP canister vent control valve for being rusted.

SEF376Z

OK or NG

䊳

GO TO 3.

䊳

Replace EVAP canister vent control valve.

IDX

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

Diagnostic Procedure

EC-563

CHECK EVAP CANISTER VENT CONTROL VALVE-II

With CONSULT-II

1. Turn ignition switch ON.
2. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
3. Check air passage continuity and operation delay time.

SEC158D

Without CONSULT-II

Check air passage continuity and operation delay time under the following conditions.

SEF378Z

Make sure new O-ring is installed properly.

OK or NG

䊳

GO TO 5.

䊳

GO TO 4.

CHECK EVAP CANISTER VENT CONTROL VALVE-III

1. Clean the air passage (Portion A to B) of EVAP canister vent control valve using an air blower.
2. Perform Test No. 3 again.

OK or NG

䊳

GO TO 5.

䊳

Replace EVAP canister vent control valve.

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

Diagnostic Procedure (Cont’d)

EC-564

CHECK VACUUM CUT VALVE

1. Turn ignition switch OFF.
2. Remove vacuum cut valve.
3. Check vacuum cut valve as follows:

SEF379Q

a. Plug port C and D with fingers.
b. Apply vacuum to port A and check that there is no suction from port B.
c. Apply vacuum to port B and check that there is suction from port A.
d. Blow air in port B and check that there is a resistance to flow out of port A.
e. Open port C and D.
f. Blow air in port A check that air flows freely out of port C.
g. Blow air in port B check that air flows freely out of port D.

OK or NG

䊳

GO TO 6.

䊳

Replace vacuum cut valve.

CHECK IF EVAP CANISTER SATURATED WITH WATER

1. Remove EVAP canister with EVAP canister vent control valve attached.
2. Check if water will drain from the EVAP canister.

SEF596U

Yes or No

Yes

䊳

GO TO 7.

䊳

GO TO 9.

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve attached.
The weight should be less than 1.8 kg (4.0 lb).

OK or NG

䊳

GO TO 9.

䊳

GO TO 8.

IDX

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

Diagnostic Procedure (Cont’d)

EC-565

DETECT MALFUNCTIONING PART

Check the following.

쐌

EVAP canister for damage

쐌

EVAP hose between EVAP canister and water separator for clogging or poor connection

䊳

Repair hose or replace EVAP canister.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE

Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.

OK or NG

䊳

GO TO 10.

䊳

Repair it.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1. Disconnect EVAP control system pressure sensor harness connector.

SEF268X

2. Check connectors for water.

Water should not exist.

OK or NG

䊳

GO TO 11.

䊳

Replace EVAP control system pressure sensor.

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

Diagnostic Procedure (Cont’d)

EC-566

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Remove EVAP control system pressure sensor with its harness connector connected.

CAUTION:

Never apply force to the air hole protector of the sensor if equipped.

SEF799W

2. Remove hose from EVAP control system pressure sensor.
3. Turn ignition switch “ON”.
4. Use pump to apply vacuum and pressure to EVAP control system pressure sensor as shown in figure.

CAUTION:

쐌

Always calibrate the vacuum pump gauge when using it.

쐌

Do not apply below −20 kPa (−150 mmHg, −5.91 inHg) or over 20 kPa (150 mmHg, 5.91 inHg) of pressure.

5. Check input voltage between ECM terminal 60 and ground.

SEC908C

MTBL1159

CAUTION:

Discard and EVAP control system pressure sensor which has been dropped from a height of more than 0.5 m
(19.7 in) onto a hard surface such as a concrete floor; use a new one.

OK or NG

䊳

GO TO 12.

䊳

Replace EVAP control system pressure sensor.

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

INSPECTION END

IDX

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

Diagnostic Procedure (Cont’d)

EC-567

On Board Diagnosis Logic

NHEC1479

SEC936C

This diagnosis detects very small leaks in the EVAP line between fuel tank and EVAP canister purge volume
control solenoid valve, using of vapor pressure in the fuel tank.
The EVAP canister vent control valve is closed to shut the EVAP purge line. The vacuum cut valve bypass
valve will then be opened to clear the line between the fuel tank and the EVAP canister purge volume con-
trol solenoid valve. The EVAP control system pressure sensor can now monitor the pressure inside the fuel
tank. If pressure increases, the ECM will check for leaks in the line between the vacuum cut valve and EVAP
canister purge volume control solenoid valve.
If ECM judges a leak which corresponds to a very small leak, the very small leak P1456 will be detected.
If ECM judges a leak equivalent to a small leak, EVAP small leak P1442 will be detected.
If ECM judges there are no leaks, the diagnosis will be OK.

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P1456
1456

Evaporative emission
control system very
small leak (positive
pressure check)

쐌

EVAP system has a very small leak.

쐌

EVAP system does not operate properly.

쐌

Incorrect fuel tank vacuum relief valve

쐌

Incorrect fuel filler cap used

쐌

Fuel filler cap remains open or fails to
close.

쐌

Foreign matter caught in fuel filler cap

쐌

Leak is in line between intake mani-
fold and EVAP canister purge volume
control solenoid valve.

쐌

Foreign matter caught in EVAP canis-
ter vent control valve

쐌

EVAP canister or fuel tank leaks

쐌

EVAP purge line (Pipe and rubber
tube) leaks

쐌

EVAP purge line rubber tube bent

쐌

Blocked or bent rubber tube to EVAP
control system pressure sensor

쐌

Loose or disconnected rubber tube

쐌

EVAP canister vent control valve and
the circuit

쐌

EVAP canister purge volume control
solenoid valve and the circuit

쐌

Fuel tank temperature sensor

쐌

O-ring of EVAP canister vent control
valve is missing or damaged.

쐌

Water separator

쐌

EVAP canister saturated with water

쐌

EVAP control system pressure sensor

쐌

Refueling control valve

쐌

ORVR system leaks

쐌

Fuel level sensor and the circuit

쐌

Foreign matter caught in EVAP canis-
ter purge volume control solenoid
valve

CAUTION:

쐌

Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,
the MIL may come on.

DTC P1456 EVAP CONTROL SYSTEM

On Board Diagnosis Logic

EC-568

쐌

If the fuel filler cap is not tightened properly, the MIL may come on.

쐌

Use only a genuine NISSAN rubber tube as a replacement.

SEC764C

SEC765C

SEC766C

DTC Confirmation Procedure

NHEC1480

CAUTION:

Never remove fuel filler cap during the DTC confirmation pro-
cedure.
NOTE:

쐌

If DTC P1456 is displayed with P0442, perform TROUBLE
DIAGNOSIS FOR DTC P1456 first.

쐌

“DTC

Confirmation

Procedure”

has

been

previously

conducted, always turn ignition switch “OFF” and wait at least
10 seconds before conducting the next test.

쐌

After repair, make sure that the hoses and clips are
installed properly.

TESTING CONDITION:

쐌

Open engine hood before conducting following proce-
dure.

쐌

If any of following conditions are met just before the DTC
confirmation procedure, leave the vehicle for more than 1
hour.

Fuel filler cap is removed.

Refilled or drained the fuel.

EVAP component parts is/are removed.

쐌

Before performing the following procedure, confirm that
battery voltage is more than 11V at idle.

With CONSULT-II

Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.

Make sure the following conditions are met.
FUEL LEVEL SE: 1.08 - 0.2V
COOLAN TEMP/S: 0 - 32°C (32 - 90°F)
FUEL T/TMP SE: 0 - 35°C (32 - 95°F)
INT A/TEMP SE: More than 0°C (32°F)
If NG, turn ignition switch “OFF” and leave the vehicle in a cool
place (soak the vehicle) or refilling/draining fuel until the out-
put voltage condition of the “FUEL LEVEL SE” meets within the
range above and leave the vehicle for more than 1 hour. Then
start from step 1).

Turn ignition switch “OFF” and wait at least 10 seconds.

Turn ignition switch “ON”.

Select “EVP V/S LEAK P0456/P1456” of “EVAPORATIVE
SYSTEM” in “DTC WORK SUPPORT” mode with CONSULT-
II.
Follow the instruction displayed.

Make sure that “OK” is displayed.
If “NG” is displayed, refer to “Diagnostic Procedure”, EC-571.

IDX

DTC P1456 EVAP CONTROL SYSTEM

On Board Diagnosis Logic (Cont’d)

EC-569

NOTE:

쐌

If the engine speed cannot be maintained within the range
displayed

CONSULT-II

screen,

“Basic

Inspection”, EC-119.

쐌

Make sure that EVAP hoses are connected to EVAP canis-
ter purge volume control solenoid valve properly.

SEF462UA

Overall Function Check

NHEC1481

WITH GST

NHEC1481S01

Use this procedure to check the overall function of the EVAP very
small leak function. During this check, a DTC might not be con-
firmed.

CAUTION:

쐌

Never use compressed air, doing so may damage the
EVAP system.

쐌

Do not start engine.

쐌

Do not exceeded 4.12 kPa (0.042 kg/cm

, 0.6 psi).

Attach the EVAP service port adapter securely to the EVAP
service port.

Set the pressure pump and a hose.

Also set a vacuum gauge via 3-way connector and a hose.

Turn ignition switch “ON”.

Connect GST and select mode 8.

Using mode 8 control the EVAP canister vent control valve
(close) and vacuum cut valve bypass valve (open).

Apply pressure and make sure the following conditions are
satisfied.
Pressure to be applied: 2.7 kPa (20 mmHg, 0.79 inHg)
Time to be waited after the pressure drawn in to the EVAP
system and the pressure to be dropped: 60 seconds and
the pressure should not be dropped more than 0.4 kPa (3
mmHg, 0.12 inHg)
If NG, go to diagnostic procedure, EC-571.
If OK, go to next step.

Disconnect GST.

Start engine and warm it up to normal operating temperature.

10) Turn ignition switch “OFF” and wait at least 10 seconds.
11) Restart engine and let it idle for 90 seconds.
12) Keep engine speed at 2,000 rpm for 30 seconds.
13) Turn ignition switch “OFF”.
NOTE:
For more information, refer to GST instruction manual.

DTC P1456 EVAP CONTROL SYSTEM

DTC Confirmation Procedure (Cont’d)

EC-570

Diagnostic Procedure

NHEC1482

CHECK FUEL FILLER CAP DESIGN

1. Turn ignition switch “OFF”.
2. Check for genuine NISSAN fuel filler cap design.

SEF915U

OK or NG

䊳

GO TO 2.

䊳

Replace with genuine NISSAN fuel filler cap.

CHECK FUEL FILLER CAP INSTALLATION

Check that the cap is tightened properly by rotating the cap clockwise.

OK or NG

䊳

GO TO 3.

䊳

1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
2. Retighten until ratcheting sound is heard.

CHECK FUEL FILLER CAP FUNCTION

Check for air releasing sound while opening the fuel filler cap.

OK or NG

䊳

GO TO 5.

䊳

GO TO 4.

IDX

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure

EC-571

CHECK FUEL TANK VACUUM RELIEF VALVE

1. Wipe clean valve housing.
2. Check valve opening pressure and vacuum.

SEF445Y

SEF943S

Pressure:

15.3 - 20.0 kPa (0.156 - 0.204 kg/cm

, 2.22 - 2.90 psi)

Vacuum:

−6.0 to −3.3 kPa (−0.061 to −0.034 kg/cm

, −0.87 to −0.48 psi)

CAUTION:

Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may come on.

OK or NG

䊳

GO TO 5.

䊳

Replace fuel filler cap with a genuine one.

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-572

INSTALL THE PRESSURE PUMP

To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely.

SEC929C

SEF916U

NOTE:
Improper installation of the EVAP service port adapter to the EVAP service port may cause leaking.

Models with CONSULT-II

䊳

GO TO 6.

Models without CON-
SULT-II

䊳

GO TO 7.

IDX

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-573

CHECK FOR EVAP LEAK

With CONSULT-II

1. Turn ignition switch “ON”.
2. Select “EVAP SYSTEM CLOSE” of “WORK SUPPORT” mode with CONSULT-II.
3. Touch “START” and apply pressure into the EVAP line until the pressure indicator reaches the middle of the bar graph.

NOTE:

쐌

Never use compressed air or a high pressure pump.

쐌

Do not exceed 4.12 kPa (0.042 kg/cm

, 0.6 psi) of pressure in the system.

PEF917U

4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details.

Refer to “EVAPORATIVE EMISSION LINE DRAWING”, EC-41.

SEF200U

OK or NG

䊳

GO TO 8.

䊳

Repair or replace.

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-574

CHECK FOR EVAP LEAK

Without CONSULT-II

1. Turn ignition switch “OFF”.
2. Apply 12 volts DC to EVAP canister vent control valve. The valve will close. (Continue to apply 12 volts until the end of

test.)

3. Apply 12 volts DC to vacuum cut valve bypass valve. The valve will open. (Continue to apply 12V until the end of test.)

SEF254X

4. Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (10 to 20 mmHg, 0.39 to 0.79 inHg), then remove

pump and EVAP service port adapter.
NOTE:

쐌

Never use compressed air or a high pressure pump.

쐌

Do not exceed 4.12 kPa (0.042 kg/cm

, 0.6 psi) of pressure in the system.

5. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details.

Refer to “EVAPORATIVE EMISSION LINE DRAWING”, EC-41.

SEF200U

OK or NG

䊳

GO TO 8.

䊳

Repair or replace.

IDX

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-575

CHECK WATER SEPARATOR

1. Check visually for insect nests in the water separator air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Check that A and C are not clogged by blowing air into B with A, and then C plugged.

PBIB1032E

5. In case of NG in items 2 - 4, replace the parts.
NOTE:
Do not disassemble water separator.

OK or NG

䊳

GO TO 9.

䊳

Replace water separator.

CHECK EVAP CANISTER VENT CONTROL VALVE, O-RING AND CIRCUIT

Refer to “DTC Confirmation Procedure”, EC-559.

OK or NG

䊳

GO TO 10.

䊳

Repair or replace EVAP canister vent control valve and O-ring or harness/connector.

CHECK IF EVAP CANISTER SATURATED WITH WATER

1. Remove EVAP canister with EVAP canister vent control valve attached.
2. Does water drain from the EVAP canister?

SEF596U

Yes or No

Yes

䊳

GO TO 11.

No (With CONSULT-II)

䊳

GO TO 13.

No (Without CONSULT-
II)

䊳

GO TO 14.

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-576

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