Infiniti Q45. Manual — part 438
DTC P0441 EVAP CONTROL SYSTEM
EC-391
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EC
DTC P0441 EVAP CONTROL SYSTEM
PFP:14950
System Description
NBS001WT
NOTE:
If DTC P0441 is displayed with other DTC such as P2122, P2123, P2127, P2128 or P2138, first perform
trouble diagnosis for other DTC.
In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions.
Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP
canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP con-
trol system pressure sensor to intake manifold vacuum.
On Board Diagnosis Logic
NBS001WU
Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow
are adequate. If not, a malfunction is determined.
DTC Confirmation Procedure
NBS001WV
CAUTION:
Always drive vehicle at a safe speed.
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:
Always perform test at a temperature of more than 5
°
C (41
°
F).
SEF323U
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0441
0441
EVAP control system
incorrect purge flow
EVAP control system does not operate
properly, EVAP control system has a leak
between intake manifold and EVAP control
system pressure sensor.
●
EVAP canister purge volume control solenoid
valve stuck closed
●
EVAP control system pressure sensor and
the circuit
●
Loose, disconnected or improper connection
of rubber tube
●
Blocked rubber tube
●
Cracked EVAP canister
●
EVAP canister purge volume control solenoid
valve circuit
●
Accelerator pedal position sensor
●
Blocked purge port
●
EVAP canister vent control valve
EC-392
DTC P0441 EVAP CONTROL SYSTEM
WITH CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and let it idle for at least 70 seconds.
4.
Select “PURG FLOW P0441” of “EVAPORATIVE SYSTEM” in
“DTC WORK SUPPORT” mode with CONSULT-II.
5.
Touch “START”.
If “COMPLETED” is displayed, go to step 7.
6.
When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions con-
tinuously until “TESTING” changes to “COMPLETED”. (It will
take at least 35 seconds.)
If “TESTING” is not changed for a long time, retry from step 2.
7.
Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”. If “NG” is displayed, refer to
.
Overall Function Check
NBS001WW
Use this procedure to check the overall monitoring function of the EVAP control system purge flow monitoring.
During this check, a 1st trip DTC might not be confirmed.
WITH GST
1.
Lift up drive wheels.
2.
Start engine (VDC switch OFF) and warm it up to normal operating temperature.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and wait at least 70 seconds.
5.
Set voltmeter probes to ECM terminal 32 (EVAP control system
pressure sensor signal) and ground.
6.
Check EVAP control system pressure sensor value at idle speed
and note it.
7.
Establish and maintain the following conditions for at least 1
minute.
Selector lever
Suitable position
VHCL SPEED SE
32 - 120 km/h (20 - 75 MPH)
ENG SPEED
500 - 3,800 rpm
B/FUEL SCHDL
1.0 - 10.0 msec
COOLAN TEMP/S
70 - 100
°
C (158 - 212
°
F)
SEF189Y
PBIB0826E
Air conditioner switch
ON
Headlamp switch
ON
Rear window defogger switch
ON
Engine speed
Approx. 3,000 rpm
Gear position
Any position other than P, N or R
PBIB1109E
DTC P0441 EVAP CONTROL SYSTEM
EC-393
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8.
Verify that EVAP control system pressure sensor value stays 0.1V less than the value at idle speed (mea-
sured at step 6) for at least 1 second.
9.
EC-393, "Diagnostic Procedure"
Diagnostic Procedure
NBS001WX
1.
CHECK EVAP CANISTER
1.
Turn ignition switch OFF.
2.
Check EVAP canister for cracks.
OK or NG
OK (With CONSULT-II)>>GO TO 2.
OK (Without CONSULT-II)>>GO TO 3.
NG
>> Replace EVAP canister.
2.
CHECK PURGE FLOW
With CONSULT-II
1.
Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port and install vacuum gauge. For the location of EVAP service port, refer to
2.
Start engine and let it idle.
3.
Select “PURG VOL CONT/V” in “ACTIVE TEST” mode with
CONSULT-II.
4.
Rev engine up to 2,000 rpm.
5.
Touch “Qd” and “Qu” on CONSULT-II screen to adjust “PURG
VOL CONT/V” opening and check vacuum existence.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 4.
3.
CHECK PURGE FLOW
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Stop engine.
3.
Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port and install vacuum gauge. For the location of EVAP service port, refer to
4.
Start engine and let it idle for at least 80 seconds.
5.
Check vacuum gauge indication when revving engine up to 2,000 rpm.
6.
Release the accelerator pedal fully and let engine idle.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 4.
PURG VOL CONT/V
Vacuum
100%
Should exist.
0%
Should not exist.
PBIB1678E
Vacuum should exist.
Vacuum should not exist.
EC-394
DTC P0441 EVAP CONTROL SYSTEM
4.
CHECK EVAP PURGE LINE
1.
Turn ignition switch OFF.
2.
Check EVAP purge line for improper connection or disconnection.
Refer to
EC-33, "EVAPORATIVE EMISSION LINE DRAWING"
.
OK or NG
OK
>> GO TO 5.
NG
>> Repair it.
5.
CHECK EVAP PURGE HOSE AND PURGE PORT
1.
Disconnect purge hoses connected to EVAP service port A and
EVAP canister purge volume control solenoid valve B .
2.
Blow air into each hose and EVAP purge port C .
3.
Check that air flows freely.
OK or NG
OK (With CONSULT-II)>>GO TO 6.
OK (Without CONSULT-II)>>GO TO 7.
NG
>> Repair or clean hoses and/or purge port.
6.
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.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
7.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to
EC-411, "Component Inspection"
OK or NG
OK
>> GO TO 8.
NG
>> Replace EVAP canister purge volume control solenoid valve.
SEF367U
SEF368U
PBIB1678E
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