Nissan Sentra. Manual — part 398
EC-288
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0441 EVAP CONTROL SYSTEM
P0441 EVAP CONTROL SYSTEM
DTC Logic
INFOID:0000000009758533
DTC DETECTION LOGIC
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.
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
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
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.
Will CONSULT be used?
YES
>> GO TO 2.
NO
>> GO TO 5.
JSBIA0416GB
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0441
EVAP PURG FLOW/MON
(Evaporative emission sys-
tem 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 sole-
noid 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 sole-
noid valve circuit
• Accelerator pedal position sensor
• Blocked purge port
• EVAP canister vent control valve
P0441 EVAP CONTROL SYSTEM
EC-289
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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2.
PERFORM DTC CONFIRMATION PROCEDURE-1
WITH CONSULT
TESTING CONDITION:
Always perform test at a temperature of 5
°C (41°F) or more.
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and let it idle for at least 70 seconds.
6. Select “PURG FLOW P0441” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode of
“ENGINE” using CONSULT.
7. Touch “START”.
Is “COMPLETED” displayed on CONSULT screen?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-2
When the following conditions are met, “TESTING” will be displayed on the CONSULT screen. Maintain the
conditions continuously until “TESTING” changes to “COMPLETED”. (It will take at least 35 seconds.)
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “TESTING” does not change for a long time, retry from step 2.
Is “COMPLETED” displayed on CONSULT screen?
YES
>> GO TO 4.
NO
>> Perform DTC CONFIRMATION PROCEDURE again. GO TO 2.
4.
PERFORM DTC CONFIRMATION PROCEDURE-3
Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT screen?
OK
>> INSPECTION END
NG
>> Proceed to
.
5.
PERFORM COMPONENT FUNCTION CHECK
WITH GST
Perform component function check. Refer to
EC-289, "Component Function Check"
.
NOTE:
Use component function check 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.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Component Function Check
INFOID:0000000009758534
1.
PERFORM COMPONENT FUNCTION CHECK
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.
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
COOLANT TEMP/S
More than 0
°C (32°F)
EC-290
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0441 EVAP CONTROL SYSTEM
4. Start engine and wait at least 70 seconds.
5. Set voltmeter probes to ECM harness connector terminals as per the following.
*1: Except for California
*2: For California
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.
8. Verify that EVAP control system pressure sensor value stays 0.1 V less than the value at idle speed (mea-
sured at step 6) for at least 1 second.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000009758535
1.
CHECK EVAP CANISTER
1. Turn ignition switch OFF.
2. Check EVAP canister for cracks.
Is the inspection result normal?
YES-1 >> With CONSULT: GO TO 2.
YES-2 >> Without CONSULT: GO TO 3.
NO
>> Replace EVAP canister. Refer to
FL-15, "Removal and Installation"
2.
CHECK PURGE FLOW
WITH CONSULT
1. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port.
2. Start engine and let it idle.
3. Select “PURG VOL CONT/V” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
4. Touch “Qd” and “Qu” on CONSULT screen to adjust “PURG VOL CONT/V” opening and check vacuum
existence.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 4.
3.
CHECK PURGE FLOW
WITHOUT CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Stop engine.
ECM
Connector
+
–
Terminal
E16
114
124
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
PURG VOL CONT/V
Vacuum
100%
Existed
0%
Not existed
P0441 EVAP CONTROL SYSTEM
EC-291
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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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
EMISSION SYSTEM : System Description"
4. Start engine and let it idle.
Never depress accelerator pedal even slightly.
5. Check vacuum gauge indication before 60 seconds pass after starting engine.
6. Rev engine up to 2,000 rpm after 100 seconds pass after starting engine.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 4.
4.
CHECK EVAP PURGE LINE
1. Turn ignition switch OFF.
2. Check EVAP purge line for improper connection or disconnection.
EC-49, "EVAPORATIVE EMISSION SYSTEM : System Description"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair EVAP purge line.
5.
CHECK EVAP PURGE HOSE AND PURGE PORT
1. Disconnect purge hoses connected to EVAP service port and
EVAP canister purge volume control solenoid valve .
2. Blow air into each hose and EVAP purge port .
3. Check that air flows freely.
Is the inspection result normal?
YES-1 >> With CONSULT: GO TO 6.
YES-2 >> Without CONSULT: GO TO 7.
NO
>> Repair or clean hoses and/or purge port.
6.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
WITH CONSULT
1. Start engine.
2. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode of “ENGINE” using CONSULT. Check that
engine speed varies according to the valve opening.
Does engine speed vary according to the valve opening?
YES
>> GO TO 8.
NO
>> GO TO 7.
Vacuum should not exist.
Vacuum should exist.
SEF367U
SEF368U
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