Nissan Frontier D40. Manual — part 504
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-707
< COMPONENT DIAGNOSIS >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
2.
Check portionof B EVAP canister vent control valve for being
rusted.
If NG, go to next step.
3.
Reconnect harness connectors disconnected.
4.
Turn ignition switch ON.
5.
Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
6.
Check air passage continuity and operation delay time.
Check new O-ring is installed properly.
Operation takes less than 1 second.
If NG, replace EVAP canister vent control valve.
If OK, go to next step.
7.
Clean the air passage (portion A to B) of EVAP canister vent control valve using an air blower.
8.
Perform step 6 again.
9.
If NG, replace EVAP canister vent control valve.
Without CONSULT-III
1.
Remove EVAP canister vent control valve from EVAP canister.
2.
Check portion B of EVAP canister vent control valve for being
rusted.
3.
Check air passage continuity and operation delay time under the
following conditions.
Check new O-ring is installed properly.
Operation takes less than 1 second.
If NG, go to next step.
4.
Clean the air passage (portion A to B) of EVAP canister vent control valve using an air blower.
5.
Perform step 3 again.
6.
If NG, replace EVAP canister vent control valve.
PBIB1033E
Condition VENT CONTROL/V
Air passage continuity
between (A) and (B)
ON
No
OFF
Yes
PBIB1033E
Condition
Air passage continuity
between (A) and (B)
12V direct current supply between
terminals 1 and 2
No
OFF
Yes
PBIB1034E
EC-708
< COMPONENT DIAGNOSIS >
[VQ40DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
DRAIN FILTER
1.
Check visually for insect nests in the drain filter air inlet.
2.
Check visually for cracks or flaws in the appearance.
3.
Check visually for cracks or flaws in the hose.
4.
Blow air into port A and check that it flows freely out of port B.
5.
Block port B.
6.
Blow air into port A and check that there is no leakage.
7.
If NG, replace drain filter.
PBIB3641E
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-709
< COMPONENT DIAGNOSIS >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
Component Description
INFOID:0000000005273678
The EVAP control system pressure sensor (2) detects pressure in
the purge line. The sensor output voltage to the ECM increases as
pressure increases.
• EVAP canister vent control valve (1)
• Drain filter (3)
• EVAP canister (4)
•
: Vehicle front
On Board Diagnosis Logic
INFOID:0000000005273679
If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
.
DTC Confirmation Procedure
INFOID:0000000005273680
1.
If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a.
Turn ignition switch OFF and wait at least 10 seconds.
b.
Turn ignition switch ON.
c.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Start engine and wait at least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.
3.
Check 1st trip DTC.
4.
If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000005273681
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
ALBIA0514ZZ
PBIB3370E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0451
0451
EVAP control system
pressure sensor perfor-
mance
ECM detects a sloshing signal from the EVAP
control system pressure sensor
• Harness or connectors
• EVAP control system pressure sensor
EC-710
< COMPONENT DIAGNOSIS >
[VQ40DE]
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
2.
Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK EVPA CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
1.
Disconnect EVAP control system pressure sensor (2) harness
connector.
-
EVAP canister vent control valve (1)
-
Drain filter (3)
-
EVAP canister (4)
-
: Vehicle front
2.
Check sensor harness connector for water.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace harness connector.
3.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-710, "Component Inspection"
OK or NG
OK
>> GO TO 4.
NG
>> Replace EVAP control system pressure sensor.
4.
CHECK INTERMITTENT INCIDENT
GI-46, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000005273682
EVAP CONTROL SYSTEM PRESSURE SENSOR
1.
Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.
Do not reuse the O-ring, replace it with a new one.
2.
Install a vacuum pump to EVAP control system pressure sensor.
3.
Turn ignition switch ON and check output voltage between ECM
terminal 32 and ground under the following conditions.
CAUTION:
• Always calibrate the vacuum pump gauge when using it.
BBIA0539E
Water should not exist.
ALBIA0514ZZ
Applied vacuum kPa
(kg/cm
2
, psi)
Voltage V
Not applied
1.8 - 4.8
-26.7 (-0.272, -3.87)
2.1 to 2.5V lower than above value
PBIB1173E
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