Infiniti I30. Emission Control System (2003 year). Manual - part 37

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

OK (With CONSULT-II)

䊳

GO TO 13.

OK (Without CONSULT-
II)

䊳

GO TO 14.

䊳

GO TO 12.

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 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 16.

䊳

GO TO 15.

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 17.

䊳

GO TO 15.

IDX

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-577

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 16.

OK (Without CONSULT-
II)

䊳

GO TO 17.

䊳

Repair or reconnect the hose.

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 18.

䊳

GO TO 17.

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-578

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.

SEC929C

SEF334X

Without CONSULT-II

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

SEC929C

SEF335X

OK or NG

䊳

GO TO 18.

䊳

Replace EVAP canister purge volume control solenoid valve.

IDX

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-579

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 19.

䊳

Replace fuel level sensor unit.

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-580

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 20.

䊳

Replace EVAP control system pressure sensor.

CHECK EVAP PURGE LINE

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

OK or NG

䊳

GO TO 21.

䊳

Repair or reconnect the hose.

IDX

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-581

CLEAN EVAP PURGE LINE

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

䊳

GO TO 22.

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 “EVAPORATIVE EMISSION LINE DRAWING”, EC-41.

OK or NG

䊳

GO TO 23.

䊳

Repair or replace hoses and tubes.

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 24.

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

3. Blow air into hose end A and check that 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 25.

䊳

Replace or refueling control valve with fuel tank.

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-582

CHECK FUEL LEVEL SENSOR

Refer to EL-140, “Fuel Level Sensor Unit Check”.

OK or NG

䊳

GO TO 26.

䊳

Replace fuel level sensor unit.

CHECK INTERMITTENT INCIDENT

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

䊳

INSPECTION END

IDX

DTC P1456 EVAP CONTROL SYSTEM

Diagnostic Procedure (Cont’d)

EC-583

SEC088D

Component Description

NHEC1111

The fuel level sensor is mounted in the fuel level sensor unit. The
sensor detects a fuel level in the fuel tank and transmits a signal
to the ECM.
It consists of two parts, one is mechanical float and the other side
is variable resistor. Fuel level sensor output voltage changes
depending on the movement of the fuel mechanical float.

On Board Diagnostic Logic

NHEC1112

ECM receives two signals from the fuel level sensor.
One is fuel level sensor power supply circuit, and the other is fuel
level sensor ground circuit.
This diagnosis indicates the latter to detect open circuit malfunc-
tion.

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P1464
1464

Fuel level sensor cir-
cuit ground signal

A high voltage from the sensor is sent to ECM.

쐌

Fuel level sensor circuit
(The fuel level sensor circuit is open
or shorted.)

DTC Confirmation Procedure

NHEC1113

NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.

SEF195Y

WITH CONSULT-II

NHEC1113S01

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Wait at least 5 seconds.

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-586.

WITH GST

NHEC1113S02

Follow the procedure “WITH CONSULT-II” above.

DTC P1464 FUEL LEVEL SENSOR

Component Description

EC-584

Wiring Diagram

NHEC1114

MEC365E

SEF711YB

IDX

DTC P1464 FUEL LEVEL SENSOR

Wiring Diagram

EC-585

Diagnostic Procedure

=NHEC1115

CHECK FUEL LEVEL SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 78 and body ground. Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to power.

OK or NG

䊳

GO TO 3.

䊳

GO TO 2.

DETECT MALFUNCTIONING PART

1. Check the following.

쐌

Harness connectors F66, M229

쐌

Harness connectors M6, B3

쐌

Harness for open between ECM and body ground

䊳

Replace open circuit or short to power in harness or connectors.

CHECK FUEL LEVEL SENSOR

Refer to EL-140, “Fuel Level Sensor Unit Check”.

OK or NG

䊳

GO TO 4.

䊳

Replace fuel level sensor unit.

CHECK INTERMITTENT INCIDENT

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

OK or NG

䊳

INSPECTION END

DTC P1464 FUEL LEVEL SENSOR

Diagnostic Procedure

EC-586

SEF278X

Description

=NHEC1116

COMPONENT DESCRIPTION

NHEC1116S01

The vacuum cut valve and vacuum cut valve bypass valve are
installed in parallel on the EVAP purge line between the fuel tank
and the EVAP canister.
The vacuum cut valve prevents the intake manifold vacuum from
being applied to the fuel tank.
The vacuum cut valve bypass valve is a solenoid type valve and
generally remains closed. It opens only for on board diagnosis.
The vacuum cut valve bypass valve responds to signals from the
ECM. When the ECM sends an ON (ground) signal, the valve is
opened. The vacuum cut valve is then bypassed to apply intake
manifold vacuum to the fuel tank.

EVAPORATIVE EMISSION SYSTEM DIAGRAM

NHEC1116S02

SEC936C

CONSULT-II Reference Value in Data Monitor
Mode

NHEC1117

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

VC/V BYPASS/V

쐌

Ignition switch: ON

OFF

On Board Diagnosis Logic

NHEC1119

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P1490
1490

Vacuum cut valve
bypass valve circuit

An improper voltage signal is sent to ECM through
vacuum cut valve bypass valve.

쐌

Harness or connectors
(The vacuum cut valve bypass valve
circuit is open or shorted.)

쐌

Vacuum cut valve bypass valve

IDX

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

Description

EC-587

DTC Confirmation Procedure

NHEC1120

NOTE:
If “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:
Before performing the following procedure, confirm that bat-
tery voltage is more than 11V at idle speed.

SEF058Y

WITH CONSULT-II

NHEC1120S01

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Start engine and wait at least 5 seconds.

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-590.

WITH GST

NHEC1120S02

Follow the procedure “WITH CONSULT-II” above.

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

DTC Confirmation Procedure

EC-588

Wiring Diagram

NHEC1121

MEC562D

SEF634XD

IDX

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

Wiring Diagram

EC-589

Diagnostic Procedure

NHEC1122

INSPECTION START

Do you have CONSULT-II?

Yes or No

Yes

䊳

GO TO 2.

䊳

GO TO 3.

CHECK VACUUM CUT VALVE BYPASS VALVE CIRCUIT

With CONSULT-II

1. Turn ignition switch “OFF” and then “ON”.
2. Select “VC/V BYPASS/V” in “ACTIVE TEST” mode with CONSULT-II.
3. Touch “ON/OFF” on CONSULT-II screen.

PBIB0157E

4. Make sure that clicking sound is heard from the vacuum cut valve bypass valve.

OK or NG

䊳

GO TO 7.

䊳

GO TO 3.

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

Diagnostic Procedure

EC-590

CHECK VACUUM CUT VALVE BYPASS VALUE POWER SUPPLY CIRCUIT

1. Turn ignition switch “OFF”.
2. Disconnect vacuum cut valve bypass valve harness connector.

SEF278X

3. Turn ignition switch “ON”.
4. Check voltage between vacuum cut valve bypass valve terminal 1 and ground with CONSULT-II or tester.

SEF356X

OK or NG

䊳

GO TO 5.

䊳

GO TO 4.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors M5, B1

쐌

Fuse block (J/B) connector M19

쐌

15A fuse

쐌

Harness for open or short between vacuum cut valve bypass valve and fuse

䊳

Repair harness or connectors.

CHECK VACUUM CUT VALVE BYPASS VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 28 and vacuum cut valve bypass valve terminal 2. Refer to Wiring

Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 7.

䊳

GO TO 6.

IDX

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

Diagnostic Procedure (Cont’d)

EC-591

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors B3, M6

쐌

Harness connectors M81, F49

쐌

Harness for open or short between vacuum cut valve bypass valve and ECM

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK VACUUM CUT VALVE BYPASS VALVE

With CONSULT-II

1. Reconnect harness disconnected connectors.
2. Turn ignition switch ON.
3. Perform “VC/V BYPASS/V” in “ACTIVE TEST” mode.
4. Check air passage continuity and operation delay time under the following conditions.

SEC156D

Without CONSULT-II

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

SEF358X

OK or NG

䊳

GO TO 8.

䊳

Replace vacuum cut valve bypass valve.

CHECK INTERMITTENT INCIDENT

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

䊳

INSPECTION END

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

Diagnostic Procedure (Cont’d)

EC-592

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