Infiniti I30. Emission Control System (2003 year). Manual - part 25

On Board Diagnosis Logic

NHEC1475

NOTE:
If DTC P0455 is displayed with P1448, perform trouble diagnosis for DTC P1448 first. (See EC-559.)
This diagnosis detects a very large leak (fuel filler cap fell off etc.) in EVAP system between the fuel tank and
EVAP canister purge volume control solenoid valve.

SEC936C

Malfunction is detected when EVAP control system has a very large leak such as fuel filler cap fell off, EVAP
control system does not operate properly.

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.

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.

Possible Cause

NHEC1476

쐌

Fuel filler cap remains open or fails to close.

쐌

Incorrect fuel tank vacuum relief valve

쐌

Incorrect fuel filler cap used

쐌

Foreign matter caught in fuel filler cap.

쐌

Leak is in line between intake manifold and EVAP canister
purge volume control solenoid valve.

쐌

Foreign matter caught in EVAP canister 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 dam-
aged.

쐌

EVAP control system pressure sensor

IDX

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

On Board Diagnosis Logic

EC-385

쐌

Refueling control valve

쐌

ORVR system leaks

SEC760C

SEC761C

SEC762C

SEC763C

DTC Confirmation Procedure

NHEC1477

CAUTION:

Never remove fuel filler cap during the DTC Confirmation Pro-
cedure.
NOTE:

쐌

If DTC P0455 is displayed with P1448, perform trouble
diagnosis for DTC P1448 first. (See EC-559.)

쐌

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

쐌

“DTC

Confirmation

Procedure”

has

been

previously

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

TESTING CONDITION:

쐌

Perform “DTC WORK SUPPORT” when the fuel level is
between 1/4 and 3/4 full, and vehicle is placed on flat level
surface.

쐌

Open engine hood before conducting the following proce-
dures.

WITH CONSULT-II

NHEC1477S01

Tighten fuel filler cap securely until ratcheting sound is heard.

Turn ignition switch “ON”.

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

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

Make sure that the following conditions are met.
COOLAN TEMP/S: 0 - 70°C (32 - 158°F)
INT/A TEMP SE: 0 - 60°C (32 - 140°F)

Select “EVAP SML LEAK P0442/P1442” of “EVAPORATIVE
SYSTEM” in “DTC WORK SUPPORT” mode with CONSULT-
II.
Follow the instruction displayed.

NOTE:
If the engine speed cannot be maintained within the range dis-
played on the CONSULT-II screen, go to “Basic Inspection”,
EC-119.
7)

Make sure that “OK” is displayed.
If “NG” is displayed, select “SELF-DIAG RESULTS” mode and
make sure that “EVAP GROSS LEAK [P0455]” is displayed. If
it is displayed, refer to “Diagnostic Procedure”, EC-387.
If P0442 is displayed, perform “Diagnostic Procedure” for DTC
P0442.

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

Possible Cause (Cont’d)

EC-386

WITH GST

NHEC1477S02

NOTE:
Be sure to read the explanation of “Driving Pattern” on EC-82
before driving vehicle.
1)

Start engine.

Drive vehicle according to “Driving Pattern”, EC-82.

Stop vehicle.

Select “MODE 1” with GST.

쐌

If SRT of EVAP system is not set yet, go to the following step.

쐌

If SRT of EVAP system is set, the result will be OK.

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

Start engine.
It is not necessary to cool engine down before driving.

Drive vehicle again according to the “Driving Pattern”, EC-82.

Stop vehicle.

Select “MODE 3” with GST.

쐌

If P0455 is displayed on the screen, go to “Diagnostic
Procedure”, EC-387.

쐌

If P0442 is displayed on the screen, go to “Diagnostic
Procedure”, for DTC P0442, EC-343.

쐌

If P0441 is displayed on the screen, go to “Diagnostic Proce-
dure” for DTC P0441, EC-334.

쐌

If P0455, P0442 and P0441 are not displayed on the screen,
go to the following step.

10) Select “MODE 1” with GST.

쐌

If SRT of EVAP system is set, the result will be OK.

쐌

If SRT of EVAP system is not set, go to step 6.

Diagnostic Procedure

NHEC1478

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.

IDX

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

DTC Confirmation Procedure (Cont’d)

EC-387

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

쐌

Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.

쐌

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.

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 P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

Diagnostic Procedure (Cont’d)

EC-388

CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks, improper connection or disconnection.
Refer to “Evaporative Emission System”, EC-37.

OK or NG

䊳

GO TO 6.

䊳

Repair or reconnect the hose.

CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

䊳

GO TO 7.

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

Refer to “DTC Confirmation Procedure”, EC-363.

OK or NG

䊳

GO TO 8.

䊳

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

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 9.

Models without CON-
SULT-II

䊳

GO TO 10.

IDX

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

Diagnostic Procedure (Cont’d)

EC-389

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 11.

䊳

Repair or replace.

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

Diagnostic Procedure (Cont’d)

EC-390

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 12.

䊳

Repair or replace.

IDX

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

Diagnostic Procedure (Cont’d)

EC-391

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

With CONSULT-II

1. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.
2. Start engine.
3. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode.
4. Touch “Qu” on CONSULT-II screen to increase “PURG VOL CONT/V” opening to 100.0%.
5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

SEC142D

Vacuum should exist.

OK or NG

䊳

GO TO 14.

䊳

GO TO 13.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.
2. Stop engine.
3. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.
4. Start engine and let it idle for at least 80 seconds.
5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

Vacuum should exist.

OK or NG

䊳

GO TO 15.

䊳

GO TO 13.

CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection. Refer to “Vacuum Hose Drawing”, EC-31.

OK or NG

OK (With CONSULT-II)

䊳

GO TO 14.

OK (Without CONSULT-
II)

䊳

GO TO 15.

䊳

Repair or reconnect the hose.

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

Diagnostic Procedure (Cont’d)

EC-392

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With CONSULT-II

1. Start engine.
2. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-II. Check that engine speed varies according

to the valve opening.

SEC142D

OK or NG

䊳

GO TO 16.

䊳

GO TO 15.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With CONSULT-II

Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.

SEF334X

Without CONSULT-II

Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.

SEF335X

OK or NG

䊳

GO TO 16.

䊳

Replace EVAP canister purge volume control solenoid valve.

IDX

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

Diagnostic Procedure (Cont’d)

EC-393

CHECK FUEL TANK TEMPERATURE SENSOR

1. Remove fuel level sensor unit.
2. Check resistance between fuel level sensor unit and fuel pump terminals 4 and 5 by heating with hot water or heat gun

as shown in the figure.

SEF587X

OK or NG

䊳

GO TO 17.

䊳

Replace fuel level sensor unit.

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

Diagnostic Procedure (Cont’d)

EC-394

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 18.

䊳

Replace EVAP control system pressure sensor.

CHECK REFUELING EVAP VAPOR LINE

Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness and improper connec-
tion. For location, refer to “ON BOARD REFUELING VAPOR RECOVERY (ORVR)”, EC-43.

OK or NG

䊳

GO TO 19.

䊳

Repair or replace hoses and tubes.

IDX

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

Diagnostic Procedure (Cont’d)

EC-395

CHECK SIGNAL LINE AND RECIRCULATION LINE

Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and
improper connection.

OK or NG

䊳

GO TO 20.

䊳

Repair or replace hoses, tubes or filler neck tube.

CHECK REFUELING CONTROL VALVE

1. Remove fuel filler cap.
2. Check air continuity between hose ends A and B.

Blow air into the hose end B. Air should flow freely into the fuel tank.

3. Blow air into hose end A and check there is no leakage.
4. Apply pressure to both hose ends A and B [20 kPa (150 mmHg, 5.91 inHg)] using a pressure pump and a suitable

3-way connector. Check that there is no leakage.

SEF830X

OK or NG

䊳

GO TO 21.

䊳

Replace refueling control valve with fuel tank.

CHECK INTERMITTENT INCIDENT

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

䊳

INSPECTION END

DTC P0455 EVAP CONTROL SYSTEM (GROSS LEAK)

Diagnostic Procedure (Cont’d)

EC-396

On Board Diagnosis Logic

NHEC0987

SEC936C

This diagnosis detects very small leaks in the EVAP line between fuel tank and EVAP canister purge volume
control solenoid valve, using the intake manifold same as a conventional EVAP small leak diagnosis.
If ECM judges a leak which corresponds to a very small leak, the very small leak P0456 will be detected.
If ECM judges a leak equivalent to a small leak, EVAP small leak P0442 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

P0456
0456

Evaporative emission
control system very
small leak (negative
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

Absolute pressure sensor

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.

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.

IDX

DTC P0456 EVAP CONTROL SYSTEM

On Board Diagnosis Logic

EC-397

SEC764C

DTC Confirmation Procedure

NHEC0988

SEC765C

SEC766C

CAUTION:

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

쐌

If DTC P0456 is displayed with P0442, perform TROUBLE
DIAGNOSIS FOR DTC P0456 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 condition is 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 5 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-399.

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.

DTC P0456 EVAP CONTROL SYSTEM

DTC Confirmation Procedure

EC-398

SEF462UA

Overall Function Check

NHEC0989

WITH GST

NHEC0989S01

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-399.

NOTE:
For more information, refer to GST instruction manual.

Diagnostic Procedure

NHEC0990

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.

IDX

DTC P0456 EVAP CONTROL SYSTEM

Overall Function Check

EC-399

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

쐌

Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.

쐌

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.

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 P0456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-400

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