Infiniti I35 (A33). Manual — part 249
System Description
NHEC0955
NOTE:
If DTC P0441 is displayed with P2122, P2123, P2127, P2128 or P2138, perform trouble diagnosis for
other DTC.
SEC936C
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
NHEC0956
Under normal conditions (non-closed throttle), sensor output volt-
age indicates if pressure drop and purge flow are adequate. If not,
a fault is determined.
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 sen-
sor.
I
EVAP canister purge volume control
solenoid valve stuck closed
I
EVAP control system pressure sensor
and the circuit
I
Loose, disconnected or improper con-
nection of rubber tube
I
Blocked rubber tube
I
Cracked EVAP canister
I
EVAP canister purge volume control
solenoid valve circuit
I
Blocked purge port
I
EVAP canister vent control valve
GI
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SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0441 EVAP CONTROL SYSTEM
System Description
EC-337
SEC140D
DTC Confirmation Procedure
NHEC0957
SEC141D
SEC759C
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 5°C (41°F) or more.
WITH CONSULT-II
NHEC0957S01
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 CONFIRMATION” 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
continuously until “TESTING” changes to “COMPLETED”. (It
will take at least 35 seconds.)
Selector lever
Suitable position
Vehicle speed
32 - 120 km/h (20 - 75 MPH)
ENG SPEED
500 - 3,000 rpm
B/FUEL SCHDL
1.3 - 8.1 msec
Engine coolant temperature
70 - 100°C (158 - 212°F)
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
“Diagnostic
Procedure”, EC-340.
SEC915C
Overall Function Check
NHEC0958
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
NHEC0958S01
1)
Lift up drive wheels.
2)
Start engine (TCS switch or VDC switch OFF) and warm it up
to normal operating temperature.
3)
Turn ignition switch OFF, wait at least 10 seconds.
4)
Start engine and wait at least 70 seconds.
DTC P0441 EVAP CONTROL SYSTEM
DTC Confirmation Procedure
EC-338
5)
Set voltmeter probes to ECM terminals 60 (EVAP control sys-
tem 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.
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
8)
Verify that EVAP control system pressure sensor value stays
0.1V less than the value at idle speed (measured at step 6) for
at least 1 second.
9)
If NG, go to “Diagnostic Procedure”, EC-340.
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DTC P0441 EVAP CONTROL SYSTEM
Overall Function Check (Cont’d)
EC-339
Diagnostic Procedure
=NHEC0959
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 service port and
install vacuum gauge.
SEC929C
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.
SEC142D
MTBL1158
OK or NG
OK
©
GO TO 7.
NG
©
GO TO 4.
DTC P0441 EVAP CONTROL SYSTEM
Diagnostic Procedure
EC-340
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