2007 INFINITI M35 control

EC-426
[VQ35DE]
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
Revision: 2007 April2007 M35/M45
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 2.0 kg (4.4 lb).
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.

EVAP canister for damage

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 connectors for water.
OK or NG
OK >> GO TO 7.
NG >> Replace EVAP control system pressure sensor.
7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-430, "
Component Inspection" .
OK or NG
OK >> GO TO 8.
NG >> Replace EVAP control system pressure sensor.
8. CHECK INTERMITTENT INCIDENT
Refer to EC-153, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionNBS0050H
EVAP CANISTER VENT CONTROL VALVE
With CONSULT-II
1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion (B) of EVAP canister vent control valve for being
rusted.
If NG, replace EVAP canister vent control valve.
If OK, go to next step.
3. Reconnect harness connectors disconnected.
4. Turn ignition switch ON.Water should not exist.
PBIB1033E

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
EC-427
[VQ35DE]
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Revision: 2007 April2007 M35/M45
5. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
6. Check air passage continuity and operation delay time.
Make sure 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.
Without CONSULT-II
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.
Make sure 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.
4. Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.
5. Perform step 3 again.
Condition VENT CONTROL/V Air passage continuity between A and B
ON No
OFF Yes
PBIB1679E
PBIB1033E
Condition Air passage continuity between (A) and (B)
12V direct current supply between
terminals (1) and (2)No
OFF Yes
PBIB1034E

EC-428
[VQ35DE]
DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
Revision: 2007 April2007 M35/M45
DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSORPFP:22365
Component DescriptionNBS0050I
The EVAP control system pressure sensor (3) detects pressure in
the purge line. The sensor output voltage to the ECM increases as
pressure increases.

Illustration shows the view from under the vehicle.

: Vehicle front

EVAP canister vent control valve (1)

EVAP canister (2)
CONSULT-II Reference Value in Data Monitor ModeNBS0050J
Specification data are reference values.
On Board Diagnosis LogicNBS0050K
NOTE:
If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
EC-486, "
DTC P0643 SENSOR POWER SUPPLY" .
PBIB2702E
PBIB1207E
MONITOR ITEM CONDITION SPECIFICATION
EVAP SYS PRES

Ignition switch: ON Approx. 1.8 - 4.8V
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0451
0451EVAP control system
pressure sensor perfor-
manceECM detects a sloshing signal from the EVAP
control system pressure sensor

Harness or connectors

EVAP control system pressure sensor

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-429
[VQ35DE]
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Revision: 2007 April2007 M35/M45
DTC Confirmation ProcedureNBS0050L
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
3. Start engine and wait at least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.
If 1st trip DTC is detected, go to EC-429, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureNBS0050M
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body.
Refer to EC-160, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
SEF194Y
1. Body ground M70 2. Body ground M16
PBIB2782E

EC-430
[VQ35DE]
DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
Revision: 2007 April2007 M35/M45
2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
1. Disconnect EVAP control system pressure sensor (3) harness
connector.
–Illustration shows the view from under the vehicle.
–: Vehicle front
–EVAP canister vent control valve (1)
–EVAP canister (2)
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
Refer to EC-430, "
Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Replace EVAP control system pressure sensor.
4. CHECK INTERMITTENT INCIDENT
Refer to EC-153, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
For Wiring Diagram, refer to EC-433, "
Wiring Diagram" .
>>INSPECTION END
Component InspectionNBS0050N
EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.
Always replace O-ring 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.

Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or
pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
4. If NG, replace EVAP control system pressure sensor.Water should not exist.
PBIB2702E
Applied vacuum kPa
(mmHg, inHg)Voltage V
Not applied 1.8 - 4.8
-26.7 (-200, -7.87) 2.1 to 2.5V lower than above value
PBIB1173E

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-431
[VQ35DE]
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Revision: 2007 April2007 M35/M45
DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSORPFP:25085
Component DescriptionNBS0050O
The EVAP control system pressure sensor (3) detects pressure in
the purge line. The sensor output voltage to the ECM increases as
pressure increases.

Illustration shows the view from under the vehicle.

: Vehicle front

EVAP canister vent control valve (1)

EVAP canister (2)
CONSULT-II Reference Value in Data Monitor ModeNBS0050P
Specification data are reference values.
On Board Diagnosis LogicNBS0050Q
NOTE:
If DTC P0452 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
EC-486, "
DTC P0643 SENSOR POWER SUPPLY" .
PBIB2702E
PBIB1207E
MONITOR ITEM CONDITION SPECIFICATION
EVAP SYS PRES

Ignition switch: ON Approx. 1.8 - 4.8V
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0452
0452EVAP control system
pressure sensor low
inputAn excessively low voltage from the sensor is
sent to ECM.

Harness or connectors
(The sensor circuit is open or shorted.)

EVAP control system pressure sensor

EC-432
[VQ35DE]
DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
Revision: 2007 April2007 M35/M45
DTC Confirmation ProcedureNBS0050R
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Always perform test at a temperature of 5°C (41°F) or more.
WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Select “DATA MONITOR” mode with CONSULT-II.
5. Make sure that “FUEL T/TMP SE” is more than 0°C (32°F).
6. Start engine and wait at least 20 seconds.
If 1st trip DTC is detected, go to EC-434, "
Diagnostic Procedure"
.
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Check that voltage between ECM terminal 107 (Fuel tank tem-
perature sensor signal) and ground is less than 4.2V.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and wait at least 20 seconds.
5. Select Service $07 with GST.
If 1st trip DTC is detected, go to EC-434, "
Diagnostic Procedure"
.
SEF194Y
PBIB1110E

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-433
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Revision: 2007 April2007 M35/M45
Wiring DiagramNBS0050S
TBWT1476E