Infiniti Q45. Manual - part 449

DTC P0448 EVAP CANISTER VENT CONTROL VALVE

EC-435

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EC

Component Inspection

NBS00232

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.

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 5 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.

SEF337X

Condition VENT CONTROL/V

Air passage continuity between A and B

ON

No

OFF

Yes

PBIB1679E

SEF337X

Condition

Air passage continuity between A and B

12V direct current supply between
 terminals 1 and 2

No

OFF

Yes

PBIB0154E

EC-436

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

PFP:25085

Component Description

NBS001XH

The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the
ECM increases as pressure increases.

CONSULT-II Reference Value in Data Monitor Mode

NBS001XI

Specification data are reference values.

On Board Diagnosis Logic

NBS001XJ

NOTE:
If DTC P0452 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to 

EC-492, "DTC P0643 SENSOR POWER SUPPLY"

 .

PBIB0026E

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
0452

EVAP control system pressure 
sensor low input

An 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

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-437

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DTC Confirmation Procedure

NBS001XK

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 more than 5

°

C (41

°

F).

 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/TEMP 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-439, "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-439, "Diagnostic Procedure"

.

SEF194Y

PBIB1110E

EC-438

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

Wiring Diagram

NBS001XL

TBWM1234E