Infiniti G37 Coupe. Manual - part 525

P0441 EVAP CONTROL SYSTEM

EC-281

< COMPONENT DIAGNOSIS >

[VQ37VHR]

C

D

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EC

N

P

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7.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-291, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace EVAP canister purge volume control solenoid valve.

8.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check connectors for water.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace EVAP control system pressure sensor.

9.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION

Refer to 

EC-307, "DTC Logic"

 for DTC P0452, 

EC-312, "DTC Logic"

 for DTC P0453.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace EVAP control system pressure sensor.

10.

CHECK RUBBER TUBE FOR CLOGGING

1.

Disconnect rubber tube connected to EVAP canister vent control valve.

2.

Check the rubber tube for clogging.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Clean the rubber tube using an air blower.

11.

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-298, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace EVAP canister vent control valve.

12.

CHECK EVAP PURGE LINE

Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks.
Refer to 

EC-80, "System Diagram"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace it.

13.

CLEAN EVAP PURGE LINE

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

>> GO TO 14.

14.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

Water should not exist.

EC-282

< COMPONENT DIAGNOSIS >

[VQ37VHR]

P0442 EVAP CONTROL SYSTEM

P0442 EVAP CONTROL SYSTEM

DTC Logic

INFOID:0000000001734105

DTC DETECTION LOGIC

NOTE:
If DTC P0442 is displayed with DTC P0456, first perform the trouble diagnosis for DTC P0456. Refer to

EC-324, "DTC Logic"

.

This diagnosis detects leaks in the EVAP purge line using engine intake manifold vacuum.
If pressure does not increase, the ECM will check for leaks in the line between the fuel tank and EVAP canister
purge volume control solenoid valve, under the following “Vacuum test” conditions.
The EVAP canister vent control valve is closed to shut the EVAP purge line off. The EVAP canister purge vol-
ume control solenoid valve will then be opened to depressurize the EVAP purge line using intake manifold
vacuum. After this occurs, the EVAP canister purge volume control solenoid valve will be closed.

CAUTION:

• Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the

MIL may come on.

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

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0442

EVAP control system 
small leak detected 
(negative pressure)

EVAP control system has a leak, EVAP 
control system does not operate prop-
erly.

• Incorrect fuel tank vacuum relief valve
• Incorrect fuel filler cap used
• Fuel filler cap remains open or fails to close.
• Foreign matter caught in fuel filler cap.
• Leak is in line between intake manifold and EVAP 

canister purge volume control solenoid valve.

• Foreign matter caught in EVAP canister vent con-

trol valve.

• EVAP canister or fuel tank leaks
• EVAP purge line (pipe and rubber tube) leaks
• EVAP purge line rubber tube bent
• Loose or disconnected rubber tube
• EVAP canister vent control valve and the circuit
• EVAP canister purge volume control solenoid 

valve and the circuit

• Fuel tank temperature sensor
• O-ring of EVAP canister vent control valve is 

missing or damaged

• EVAP canister is saturated with water
• EVAP control system pressure sensor
• Fuel level sensor and the circuit
• Refueling EVAP vapor cut valve
• ORVR system leaks

PBIB1026E

P0442 EVAP CONTROL SYSTEM

EC-283

< COMPONENT DIAGNOSIS >

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• Use only a genuine NISSAN rubber tube as a replacement.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
TESTING CONDITION:
• Perform “DTC WORK SUPPORT” when the fuel level is between 1/4 and 3/4 full, and vehicle is placed

on flat level surface.

• Always perform test at a temperature of 0 to 30

°

C (32 to 86

°

F).

NOTE:
Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve
properly.

Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

1.

Turn ignition switch ON.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

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

4.

Make sure that the following conditions are met.
COOLAN TEMP/S: 0 - 70

°

C (32 - 158

°

F)

INT/A TEMP SE: 0 - 30

°

C (32 - 86

°

F)

5.

Select “EVAP SML LEAK P0442/P1442” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode
with CONSULT-III.
Follow the instruction displayed.
NOTE:
If the engine speed cannot be maintained within the range displayed on the CONSULT-III screen, go to

EC-13, "BASIC INSPECTION : Special Repair Requirement"

.

Which is displayed on CONSULT-III screen?

OK

>> INSPECTION END

NG

>> Go to 

EC-283, "Diagnosis Procedure"

.

3.

PERFORM DTC CONFIRMATION PROCEDURE

With GST

NOTE:
Be sure to read the explanation of Driving Pattern in 

EC-557, "How to Set SRT Code"

 before driving vehicle.

1.

Start engine.

2.

Drive vehicle according to Driving Pattern,

3.

Stop vehicle.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Turn ignition switch ON.

6.

Turn ignition switch OFF and wait at least 10 seconds.

7.

Check 1st trip DTC.

Is 1st trip DTC displayed?

YES-1 >> P0441: Go to 

EC-279, "Diagnosis Procedure"

.

YES-2 >> P0442: Go to 

EC-283, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001734106

1.

CHECK FUEL FILLER CAP DESIGN

1.

Turn ignition switch OFF.

EC-284

< COMPONENT DIAGNOSIS >

[VQ37VHR]

P0442 EVAP CONTROL SYSTEM

2.

Check for genuine NISSAN fuel filler cap design.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace with genuine NISSAN fuel filler cap.

2.

CHECK FUEL FILLER CAP INSTALLATION

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

ratcheting sound is heard.

3.

CHECK FUEL FILLER CAP FUNCTION

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK FUEL TANK VACUUM RELIEF VALVE

Refer to 

EC-287, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace fuel filler cap with a genuine one.

5.

CHECK FOR EVAP LEAK

Refer to 

EC-602, "Inspection"

.

Is there any leak in EVAP line?

YES

>> Repair or replace.

NO

>> GO TO 6.

6.

CHECK EVAP CANISTER VENT CONTROL VALVE

Check the following.
• EVAP canister vent control valve is installed properly.

Refer to 

EC-604, "Removal and Installation"

.

• EVAP canister vent control valve.

Refer to 

EC-298, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace EVAP canister vent control valve and O-ring.

7.

CHECK IF EVAP CANISTER SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.

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