Infiniti M35/M45 Y50. Manual — part 478
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
EC-385
[VQ35DE]
C
D
E
F
G
H
I
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K
L
M
A
EC
11.
CHECK INTERMITTENT INCIDENT
Refer to
EC-153, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
Trouble is fixed.>>INSPECTION END
Trouble is not fixed.>>Replace three way catalyst assembly.
EC-386
[VQ35DE]
DTC P0441 EVAP CONTROL SYSTEM
DTC P0441 EVAP CONTROL SYSTEM
PFP:14950
System Description
NBS004ZG
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
NBS004ZH
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
NBS004ZI
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.
PBIB1026E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0441
0441
EVAP control system
incorrect purge flow
EVAP control system does not operate prop-
erly, EVAP control system has a leak between
intake manifold and EVAP control system pres-
sure sensor.
●
EVAP canister purge volume control
solenoid valve stuck closed
●
EVAP control system pressure sensor
and the circuit
●
Loose, disconnected or improper con-
nection 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
DTC P0441 EVAP CONTROL SYSTEM
EC-387
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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 CON-
SULT-II.
5.
Touch “START”.
If “COMPLETED” is displayed, go to step 7.
6.
When the following conditions are met, “TESTING” will be displayed on the CONSULT-II screen. Maintain
the conditions continuously 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
NBS004ZJ
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, wait at least 10 seconds.
4.
Start engine and wait at least 70 seconds.
5.
Set voltmeter probes to ECM terminals 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.
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.
Selector lever
Suitable position
VHCL SPEED SE
32 - 120 km/h (20 - 75 MPH)
ENG SPEED
500 - 3,000 rpm
B/FUEL SCHDL
1.3 - 9.0 msec
COOLAN TEMP/S
70 - 100
°
C (158 - 212
°
F)
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
EC-388
[VQ35DE]
DTC P0441 EVAP CONTROL SYSTEM
9.
If NG, go to
EC-388, "Diagnostic Procedure"
Diagnostic Procedure
NBS004ZK
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.
Do not depress accelerator pedal even slightly.
5.
Check vacuum gauge indication before 60 seconds passed after starting engine.
6.
Revving engine up to 2,000rpm after 100 seconds passed after starting engine.
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 not exist.
Vacuum should exist.
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