Nissan Maxima. Instruction — part 464
EC-340
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and drain filter for clogging or poor connection
>> Repair hose or replace EVAP canister. Refer to
FL-14, "Removal and Installation (EVAP Canis-
.
7.
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 8.
NO
>> Replace EVAP control system pressure sensor. Refer to
FL-17, "Removal and Installation"
.
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-340, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace EVAP control system pressure sensor. Refer to
FL-17, "Removal and Installation"
.
9.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000010095023
EVAP CANISTER VENT CONTROL VALVE
1.
CHECK EVAP CANISTER VENT CONTROL VALVE-I
1. Remove EVAP canister vent control valve from EVAP canister. Refer to
FL-16, "Removal and Installation"
.
2. Check portion (A) of EVAP canister vent control valve for rust.
Is it rusted?
YES
>> Replace EVAP canister vent control valve. Refer to
16, "Removal and Installation"
.
NO
>> GO TO 2.
2.
CHECK EVAP CANISTER VENT CONTROL VALVE-II
With CONSULT
1. Reconnect harness connectors disconnected.
2. Turn ignition switch ON.
3. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
JMBIA0168ZZ
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-341
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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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
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.
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
With CONSULT
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
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. Refer to
FL-16, "Removal and Installation"
.
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.
Condition VENT CONTROL/V
Air passage continuity between (A) and (B)
ON
Not existed
OFF
Existed
Condition
Air passage continuity between (A) and (B)
12 V direct current supply between
terminals 1 and 2
Not existed
OFF
Existed
JMBIA0169ZZ
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-342
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
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-343
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
Description
INFOID:0000000010095024
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:0000000010095025
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
NOTE:
Never remove fuel filler cap during DTC confirmation procedure.
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting 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.
With CONSULT>>GO TO 2.
Without CONSULT>>GO TO 5.
2.
PERFORM DTC CONFIRMATION PROCEDURE-1
With CONSULT
1. Start engine and let it idle for least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> GO TO 3.
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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