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Infiniti QX56 (JA60). Manual - part 400

EC-252

< COMPONENT DIAGNOSIS >

[VK56DE]

P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors C1, E41

• Harness connectors E5, F14

• Harness for open or short between EVAP control system pressure sensor and ECM

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

CHECK RUBBER TUBE

1. Disconnect rubber tube connected to EVAP canister vent control valve.

2. Check the rubber tube for clogging, vent or kinked.
OK or NG

>> GO TO 10.

>> Clean the rubber tube using an air blower, repair or replace rubber tube.

10.

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to

EC-236, "Component Inspection"

OK or NG

>> GO TO 11.

>> Replace EVAP canister vent control valve.

11.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to

EC-253, "Component Inspection"

OK or NG

>> GO TO 12.

>> Replace EVAP control system pressure sensor.

12.

CHECK IF EVAP CANISTER SATURATED WITH WATER

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

attached.

2. Check if water will drain from the EVAP canister.
Yes or No

Yes

>> GO TO 13.

>> GO TO 15.

13.

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor

attached.

The weight should be less than 3.2 kg (7.1 lb).
OK or NG

>> GO TO 15.

>> GO TO 14.

14.

DETECT MALFUNCTIONING PART

Check the following.

• EVAP canister for damage

• EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

>> Repair hose or replace EVAP canister.

BBIA0351E

P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-253

< COMPONENT DIAGNOSIS >

[VK56DE]

15.

CHECK INTERMITTENT INCIDENT

Refer to

GI-35, "How to Check Terminal"

and

GI-38, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000005149276

EVAP CONTROL SYSTEM PRESSURE SENSOR

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

Always replace O-ring with a new one.

2. Install a vacuum pump to EVAP control system pressure sensor.
3. Turn ignition switch ON and check output voltage between ECM

terminal 32 and ground under the following conditions.

CAUTION:

• Always calibrate the vacuum pump gauge when using it.

• Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or

pressure over 101.3 kPa (760 mmHg, 29.92 inHg).

4. If NG, replace EVAP control system pressure sensor.

Applied vacuum [kPa

(mmHg, inHg)]

Voltage (V)

Not applied

1.8 - 4.8

-26.7 (-200, -7.87)

2.1 to 2.5 lower than above value

PBIB1173E

EC-254

< COMPONENT DIAGNOSIS >

[VK56DE]

P0455 EVAP CONTROL SYSTEM

P0455 EVAP CONTROL SYSTEM

On Board Diagnosis Logic

INFOID:0000000005149277

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.

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.

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

DTC Confirmation Procedure

INFOID:0000000005149278

CAUTION:

Never remove fuel filler cap during the DTC Confirmation Procedure.

NOTE:

PBIB1026E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0455
0455

EVAP control system
gross leak detected

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

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

EVAP canister purge volume control sole-
noid valve.

• Foreign matter caught in EVAP canister vent

control 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 cir-

cuit

• EVAP canister purge volume control sole-

noid valve and the circuit

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

missing or damaged.

• EVAP control system pressure sensor
• Refueling EVAP vapor cut valve
• ORVR system leaks

P0455 EVAP CONTROL SYSTEM

EC-255

< COMPONENT DIAGNOSIS >

[VK56DE]

• Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve

properly.

• If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next step.

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
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.

• Open engine hood before conducting the following procedures.

WITH CONSULT-III

1. Tighten fuel filler cap securely until ratcheting sound is heard.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
5. 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)

6. Select “EVP 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"

7. Make sure that “OK” is displayed.

If “NG” is displayed, select “SELF-DIAG RESULTS” mode and make sure that “EVAP GROSS LEAK