Infiniti QX56 (Z62). Manual — part 584
EC-314
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0441 EVAP CONTROL SYSTEM
5.
Set voltmeter probes to ECM harness connector terminals under the following conditions.
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:0000000006288306
1.
CHECK EVAP CANISTER
1.
Turn ignition switch OFF.
2.
Check EVAP canister for cracks.
Is the inspection result normal?
YES-1 >> With CONSULT-III: GO TO 2.
YES-2 >> Without CONSULT-III: GO TO 3.
NO
>> Replace EVAP canister. Refer to
FL-12, "Removal and Installation"
2.
CHECK PURGE FLOW
WITH CONSULT-III
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 with CONSULT-III.
4.
Touch “Qd” and “Qu” on CONSULT-III 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-III
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
EMISSION SYSTEM : System Description"
ECM
Connector
+
–
Terminal
Terminal
E80
143
(EVAP control system pressure sensor signal)
150
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-315
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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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.
Refer to
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 (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.
Is the inspection result normal?
YES-1 >> With CONSULT-III: GO TO 6.
YES-2 >> Without CONSULT-III: GO TO 7.
NO
>> Repair or clean hoses and/or purge port.
6.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
WITH CONSULT-III
1.
Start engine.
2.
Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III. Check that engine speed var-
ies according to the valve opening.
Does engine speed vary according to the valve opening?
YES
>> GO TO 8.
NO
>> GO TO 7.
7.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
EC-320, "Component Inspection (EVAP Canister Purge Volume Control Solenoid Valve)"
Is the inspection result normal?
Vacuum should not exist.
Vacuum should exist.
SEF367U
SEF368U
EC-316
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0441 EVAP CONTROL SYSTEM
YES
>> GO TO 8.
NO
>> Replace EVAP canister purge volume control solenoid valve. Refer to
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1.
Disconnect EVAP control system pressure sensor harness connector.
2.
Check that water is not inside connectors.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace EVAP control system pressure sensor. Refer to
9.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Replace EVAP control system pressure sensor.
10.
CHECK RUBBER TUBE FOR CLOGGING
1.
Disconnect rubber tube connected to EVAP canister vent control valve.
2.
Check the rubber tube for clogging.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Clean the rubber tube using an air blower.
11.
CHECK EVAP CANISTER VENT CONTROL VALVE
EC-327, "Component Inspection (EVAP Canister Vent Control Valve)"
.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Replace EVAP canister vent control valve.
12.
CHECK EVAP PURGE LINE
Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks.
Refer to
.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Repair or replace malfunctioning part.
13.
CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
>> GO TO 14.
14.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
>> INSPECTION END
P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
EC-317
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
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P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
DTC Logic
INFOID:0000000006288307
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
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 CONFIRMATION PROCEDURE” when the fuel level is between 1/4 and 3/4 full, and
vehicle is placed on flat level surface.
• Always perform test at a temperature of 5 to 60
°
C (41 to 140
°
F).
• Cool the vehicle so that engine coolant temperature becomes same level as ambient temperature.
Do you have CONSULT-III
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
PERFORM DTC CONFIRMATION PROCEDURE A
WITH CONSULT-III
1.
Turn ignition switch ON.
2.
Check that the following condition are met.
FUEL T/TMP SE: 0 - 35
°
C (32 - 95
°
F)
3.
Start engine and wait at least 60 seconds.
4.
Check 1st trip DTC.
IS 1st trip DTC detected?
OK
>> Proceed to
.
NG
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE B
WITH CONSULT-III
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.
Turn ignition switch ON.
6.
Select “PURG VOL CN/V P1444” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with
CONSULT-III.
7.
Touch “START”.
8.
Start engine and let it idle until “TESTING” on CONSULT-III changes to “COMPLETED”. (It will take
approximately 10 seconds.)
If “TESTING” is not displayed after 5 minutes, retry from step 2.
9.
Touch “SELF-DIAG RESULTS”.
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0443
PURG VOLUME CONT/V
(EVAP canister purge vol-
ume control solenoid valve)
A
The canister purge flow is detected dur-
ing the vehicle is stopped while the en-
gine is running, even when EVAP
canister purge volume control solenoid
valve is completely closed.
• EVAP control system pressure sensor
• EVAP canister purge volume control
solenoid valve
(The valve is stuck open.)
• EVAP canister vent control valve
• EVAP canister
• Hoses
(Hoses are connected incorrectly or
clogged.)
B
The canister purge flow is detected dur-
ing the specified driving conditions, even
when EVAP canister purge volume con-
trol solenoid valve is completely closed.
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