Nissan Quest E52. Instruction — part 523
EC-302
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
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
.
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
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-303
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
DTC Logic
INFOID:0000000009651137
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.
3.
PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
1.
Select “EVAP DIAG READY” in “DATA MONITOR” mode of “ENGINE”.
2.
Let it idle until “OFF” of “EVAP DIAG READY” changes to “ON”.
NOTE:
It will take at most 2 hours until “OFF” of “EVAP DIAG READY” changes to “ON”.
3.
Turn ignition switch OFF and wait at least 90 minutes.
NOTE:
Never turn ignition switch ON during 90 minutes.
4.
Turn ignition switch ON.
5.
Select “EVAP LEAK DIAG” in “DATA MONITOR” mode of “ENGINE”.
6.
Check that “EVAP LEAK DIAG” indication.
Which is displayed on CONSULT?
CMPLT >> GO TO 4.
YET
>> 1.
Perform DTC CONFIRMATION PROCEDURE again.
2.
GO TO 1.
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.)
[CKP sensor (POS) circuit is shorted.]
(APP sensor 2 circuit is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
• EVAP control system pressure sensor
• Crankshaft position sensor (POS)
• Accelerator pedal position sensor
• Refrigerant pressure sensor
EC-304
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
4.
PERFORM DTC CONFIRMATION PROCEDURE-3
With CONSULT
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
5.
PERFORM DTC CONFIRMATION PROCEDURE-4
With GST
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 6.
6.
PERFORM DTC CONFIRMATION PROCEDURE-5
With GST
1.
Let it idle for at least 2 hours.
2.
Turn ignition switch OFF and wait at least 90 minutes.
NOTE:
Never turn ignition switch ON during 90 minutes.
3.
Turn ignition switch ON.
4.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009651138
1.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
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 2.
NO
>> Repair or replace harness connector.
2.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY
1.
Turn ignition switch ON.
2.
Check the voltage between EVAP control system pressure sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 3.
3.
CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
EVAP control system pressure sensor
Ground
Voltage (V)
Connector
Terminal
B22
3
Ground
Approx. 5
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-305
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair short to ground or short to power in harness or connectors.
4.
CHECK COMPONENTS
Check the following.
• Crankshaft position sensor (POS) (Refer to
EC-273, "Component Inspection"
• Refrigerant pressure sensor (Refer to
.)
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace malfunctioning components.
5.
CHECK APP SENSOR
Check APP sensor. Refer to
EC-405, "Component Inspection"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
NO
>> Replace accelerator pedal assembly. Refer to
6.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Check EVAP control system pressure sensor. Refer to
EC-305, "Component Inspection"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
NO
>> Replace EVAP control system pressure sensor. Refer to
Component Inspection
INFOID:0000000009651139
1.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1.
Turn ignition switch OFF.
2.
Remove EVAP control system pressure sensor with its harness connector. Refer to
.
Always replace O-ring with a new one.
3.
Install a vacuum pump to EVAP control system pressure sensor.
4.
Turn ignition switch ON and check output voltage between ECM terminals under the following conditions.
CAUTION:
• Always calibrate the vacuum pump gauge when using it.
• Never apply below -93.3 kPa (-0.952 kg/cm
2
, -13.53 psi) or pressure over 101.3 kPa (1.033 kg/cm
2
,
14.69 psi).
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace EVAP control system pressure sensor. Refer to
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F8
96
Refrigerant pressure sensor
E300
1
54
CKP sensor (POS)
F20
1
E16
103
APP sensor
E110
5
107
EVAP control system pressure sensor
B22
3
ECM
Applied vacuum kPa
(kg/cm
2
, psi)
Voltage
Connector
+
–
Terminal
Terminal
E16
102
(EVAP control system
pressure sensor signal)
112
(Sensor ground)
Not applied
1.8 - 4.8 V
-26.7 (-0.272, -3.87)
2.1 to 2.5 V lower than
above value
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