Infiniti Q45 (FY33). Manual — part 225
q
A
CHECK COMPONENT
(EGRC-BPT valve).
Refer to “COMPONENT INSPECTION”,
EC-431.
OK
E
NG
Replace EGRC-BPT valve.
Check resistance of EGR temperature
sensor. Refer to EC-431.
E
NG
Replace EGR temperature
sensor.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1402
EGR Function (Open) (Cont’d)
H
H
H
H
EC-429
MEF137D
COMPONENT INSPECTION
EGR valve
I
Apply vacuum to EGR valve vacuum port with a hand vacuum
pump.
EGR valve spring should lift.
I
Check for sticking.
If NG, repair or replace EGR valve.
SEF799X
MEC488B
EGRC-solenoid valve
Check air passage continuity.
Perform “EGRC SOLENOID VALVE” in “ACTIVE TEST”
mode.
Condition
EGRC SOLENOID VALVE
Air passage
continuity
between
q
A
and
q
B
Air passage
continuity
between
q
A
and
q
C
ON (FLOW)
Yes
No
OFF (CUT)
No
Yes
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Check solenoid valve, following the table as shown below:
Conditions
Air passage
continuity
between
q
A
and
q
B
Air passage
continuity
between
q
A
and
q
C
12V direct current supply
between terminals
q
1
and
q
2
Yes
No
No supply
No
Yes
If NG or operation takes more than 1 second, replace the
solenoid valve.
TROUBLE DIAGNOSIS FOR DTC P1402
EGR Function (Open) (Cont’d)
EC-430
SEF643Q
EGR temperature sensor
Check resistance change and resistance value.
EGR temperature
°C (°F)
Voltage*
(V)
Resistance
(M
Ω
)
0 (32)
4.61
0.68 - 1.11
50 (122)
2.53
0.092 - 0.12
100 (212)
0.87
0.017 - 0.024
If NG, replace EGR temperature sensor.
SEF320U
SEF083P
EGRC-BPT valve
1.
Plug one of two ports of EGRC-BPT valve.
2.
Vacuum from the other port and check for leakage while apply-
ing a pressure above 0.981 kPa (100 mmH
2
O, 3.94 inH
2
O)
from under EGRC-BPT valve.
3.
If a leakage is noted, replace the valve.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1402
EGR Function (Open) (Cont’d)
EC-431
Evaporative Emission (EVAP) Control System
(Small Leak) (Positive Pressure)
Note: If DTC P1448 is displayed with P1440, perform TROUBLE DIAGNOSIS FOR DTC P1448 first. (See
ON BOARD DIAGNOSIS LOGIC
This diagnosis detects leaks in the EVAP purge line using of vapor pressure in the fuel tank.
The EVAP canister vent control valve is closed to shut the EVAP purge line. The vacuum cut valve bypass
valve will then be opened to clear the line between the fuel tank and the EVAP canister purge control valve.
The EVAP control system pressure sensor can now monitor the pressure inside the fuel tank.
If pressure increases, the ECM will check for leaks in the line between the vacuum cut valve and EVAP can-
ister purge control valve.
SEF850U
ON BOARD DIAGNOSIS LOGIC
Diagnostic
Trouble Code
No.
Malfunction is detected when .
Check Items
(Possible Cause)
P1440
0213
I
EVAP control system has a leak.
I
EVAP control system does not operate properly.
I
Incorrect fuel tank vacuum relief valve
I
Incorrect fuel filler cap used
I
Fuel filler cap remains open or fails to close.
I
Foreign matter caught in fuel filler cap.
I
Leak is in line between intake manifold and EVAP
canister purge control valve.
I
Foreign matter caught in EVAP canister vent control
valve.
I
EVAP canister or fuel tank leaks
I
EVAP purge line (pipe and rubber tube) leaks
I
EVAP purge line rubber tube bent.
I
Blocked or bent rubber tube to EVAP control system
pressure sensor
I
EVAP control system pressure sensor
I
Loose or disconnected rubber tube
I
EVAP canister vent control valve and the circuit
I
EVAP canister purge control valve
I
EVAP canister purge volume control valve
I
EVAP canister purge control solenoid valve
I
Absolute pressure sensor
I
Fuel tank temperature sensor
I
MAP/BARO switch solenoid valve
I
Blocked or bent rubber tube to MAP/BARO switch
solenoid valve
I
O-ring of EVAP canister vent control valve is missing
or damaged.
I
Water separator
I
EVAP canister is saturated with water.
CAUTION:
I
Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,
the MIL may come on.
I
If the fuel filler cap is not tightened properly, the MIL may come on.
I
Use only a genuine NISSAN rubber tube as a replacement.
TROUBLE DIAGNOSIS FOR DTC P1440
EC-432
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