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Nissan Titan. Manual - part 248

P0442 EVAP CONTROL SYSTEM

EC-293

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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

attached.

2. Does water drain from the EVAP canister?
Yes or No

Yes

>> GO TO 11.

No (With CONSULT)>>GO TO 13.

No (Without CONSULT)>>GO TO 14.

11.

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 2.5 kg (5.5 lb).
OK or NG

OK (With CONSULT)>>GO TO 13.

OK (Without CONSULT)>>GO TO 14.

>> GO TO 12.

12.

DETECT MALFUNCTIONING PART

Check the following.

• EVAP canister for damage

• EVAP hose between EVAP canister and drain filter for clogging or poor connection

>> Repair hose or replace EVAP canister.

13.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

With CONSULT

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 screen to increase “PURG VOL CONT/V” opening to 100%.

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

OK or NG

>> GO TO 16.

>> GO TO 15.

14.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

Without CONSULT

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.

OK or NG

>> GO TO 17.

>> GO TO 15.

15.

CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection. Refer to

EC-31, "Description"

BBIA0351E

Vacuum should exist.

EC-294

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P0442 EVAP CONTROL SYSTEM

OK or NG

>> GO TO 16.

>> Repair or reconnect the hose.

16.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to

EC-303, "Component Inspection"

OK or NG

>> GO TO 17.

>> Replace EVAP canister purge volume control solenoid valve.

17.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to

EC-257, "Component Inspection"

OK or NG

>> GO TO 18.

>> Replace fuel level sensor unit.

18.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to

EC-315, "Component Inspection"

OK or NG

>> GO TO 19.

>> Replace EVAP control system pressure sensor.

19.

CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.

Refer to

EC-31, "Description"

OK or NG

>> GO TO 20.

>> Repair or reconnect the hose.

20.

CLEAN EVAP PURGE LINE

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

>> GO TO 21.

21.

CHECK EVAP/ORVR LINE

Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper con-

nection. For location, refer to

EC-474

OK or NG

>> GO TO 22.

>> Repair or replace hoses and tubes.

22.

CHECK RECIRCULATION LINE

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

improper connection.
OK or NG

>> GO TO 23.

>> Repair or replace hose, tube or filler neck tube.

23.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to

EC-477, "Component Inspection"

OK or NG

>> GO TO 24.

>> Replace refueling EVAP vapor cut valve with fuel tank.

24.

CHECK FUEL LEVEL SENSOR

Refer to

MWI-38, "Component Inspection"

OK or NG

P0442 EVAP CONTROL SYSTEM

EC-295

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

>> GO TO 25.

>> Replace fuel level sensor unit.

25.

CHECK INTERMITTENT INCIDENT

Refer to

GI-39, "How to Check Terminal"

and

GI-42, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000009886701

FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FILLER CAP)

1. Wipe clean valve housing.

2. Check valve opening pressure and vacuum.

3. If out of specification, replace fuel filler cap as an assembly.

CAUTION:

Use only a genuine fuel filler cap as a replacement. If an incor-

rect fuel filler cap is used, the MIL may come on.

DRAIN FILTER

1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.

SEF445Y

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)

SEF943S

PBIB3641E

EC-296

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Description

INFOID:0000000009886702

SYSTEM DESCRIPTION

*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.

This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass pas-

sage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP

canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the

ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is

determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor

from the EVAP canister is regulated as the air flow changes.

COMPONENT DESCRIPTION

The EVAP canister purge volume control solenoid valve uses a ON/

OFF duty to control the flow rate of fuel vapor from the EVAP canis-

ter. The EVAP canister purge volume control solenoid valve is

moved by ON/OFF pulses from the ECM. The longer the ON pulse,

the greater the amount of fuel vapor that will flow through the valve.

On Board Diagnosis Logic

INFOID:0000000009886703

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

EVAP canister
purge flow control

EVAP canister purge vol-
ume control solenoid valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Battery

Battery voltage*

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Fuel tank temperature sensor

Fuel temperature in fuel tank

Wheel sensor

Vehicle speed*

PBIB2057E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0443
0443

EVAP canister purge
volume control solenoid
valve

The canister purge flow is detected during the
specified driving conditions, even when EVAP
canister purge volume control solenoid valve is
completely closed.

• EVAP control system pressure sensor
• EVAP canister purge volume control so-

lenoid valve
(The valve is stuck open.)

• EVAP canister vent control valve
• Drain filter
• EVAP canister
• Hoses

(Hoses are connected incorrectly or
clogged.)

Content .. 246 247 248 249 ..