Nissan Altima L32. Instruction — part 552
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-1329
< COMPONENT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
-
Fully released accelerator pedal and keep engine idle for at least 35 seconds.
7. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
EC-1329, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004362171
1.
CHECK RUBBER TUBE
1. Turn ignition switch OFF.
2. Disconnect rubber tube connected to EVAP canister vent control valve.
3. Check the rubber tube for clogging.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Clean rubber tube using an air blower.
2.
CHECK EVAP CANISTER VENT CONTROL VALVE
EC-1330, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace EVAP canister vent control valve.
3.
CHECK IF EVAP CANISTER IS SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
2. Check if water will drain from the EVAP canister.
Does water drain from the EVAP canister?
YES
>> GO TO 4.
NO
>> GO TO 6.
4.
CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• EVAP canister for damage
JMBIA1516GB
PBIB1213E
EC-1330
< COMPONENT DIAGNOSIS >
[VQ35DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
• EVAP hose between EVAP canister and vehicle frame for clogging or poor connection
>> Repair hose or replace EVAP canister.
6.
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 7.
NO
>> Replace EVAP control system pressure sensor.
7.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-1334, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace EVAP control system pressure sensor.
8.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000004362172
1.
CHECK EVAP CANISTER VENT CONTROL VALVE-I
1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion (A) of EVAP canister vent control valve for rust.
Is it rusted?
YES
>> Replace EVAP canister vent control valve.
NO
>> GO TO 2.
2.
CHECK EVAP CANISTER VENT CONTROL VALVE-II
With CONSULT-III
1. Reconnect harness connectors disconnected.
2. Turn ignition switch ON.
3. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
4. Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.
Operation takes less than 1 second.
Without CONSULT-III
1. Disconnect EVAP canister vent control valve harness connector.
2. Check air passage continuity and operation delay time under the
following conditions.
Check that new O-ring is installed properly.
JMBIA0168ZZ
Condition VENT CONTROL/V
Air passage continuity between (A) and (B)
ON
Not existed
OFF
Existed
JMBIA0169ZZ
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-1331
< COMPONENT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Operation takes less than 1 second.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 3.
3.
CHECK EVAP CANISTER VENT CONTROL VALVE-III
With CONSULT-III
1. Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.
2. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
3. Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.
Operation takes less than 1 second.
Without CONSULT-III
1. Clean the air passage [portion (A) to (B)] of EVAP canister vent
control valve using an air blower.
2. Check air passage continuity and operation delay time under the
following conditions.
Check that new O-ring is installed properly.
Operation takes less than 1 second.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace EVAP canister vent control valve
Condition
Air passage continuity between (A) and (B)
12 V direct current supply between
terminals 1 and 2
Not existed
OFF
Existed
Condition VENT CONTROL/V
Air passage continuity between (A) and (B)
ON
No
OFF
Yes
Condition
Air passage continuity between (A) and (B)
12 V direct current supply between
terminals (1) and (2)
No
OFF
Yes
JMBIA0169ZZ
EC-1332
< COMPONENT DIAGNOSIS >
[VQ35DE]
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
Description
INFOID:0000000004362173
The EVAP control system pressure sensor detects pressure in the
purge line. The sensor output voltage to the ECM increases as pres-
sure increases.
DTC Logic
INFOID:0000000004362174
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and wait at least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
EC-1332, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004362175
1.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
PBIB3370E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0451
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
circuit is shorted.)
[Crankshaft position (CKP) sensor (POS)
circuit is shorted.]
[Accelerator pedal position (APP) sensor
2 circuit is shorted.]
(Refrigerant pressure sensor circuit is
shorted.)
• EVAP control system pressure sensor
• CKP sensor (POS)
• APP sensor
• Refrigerant pressure sensor
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