Infiniti Q45. Manual - part 452

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-447

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2. 

CHECK CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

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 POWER SUPPLY CIRCUIT

1.

Turn ignition switch ON.

2.

Check voltage between EVAP control system pressure sensor
terminal 1 and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors B401, B251

●

Harness connectors B211, M141

●

Harness connectors M135, F105

●

Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

Water should not exist.

PBIB0026E

Voltage: Approximately 5V

PBIB0155E

EC-448

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR

5. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND 

SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between EVAP control system pressure sensor terminal 3 and ECM terminal
67.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors B401, B251

●

Harness connectors B211, M141

●

Harness connectors M135, F105

●

Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

7. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND 

SHORT

1.

Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal
2.
Refer to Wiring Diagram.

2.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors B401, B251

●

Harness connectors B211, M141

●

Harness connectors M135, F105

●

Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

9. 

CHECK RUBBER TUBE

1.

Disconnect rubber tube connected to EVAP canister vent control valve.

2.

Check the rubber tube for clogging, vent and kinked.

OK or NG

OK

>> GO TO 10.

NG

>> Clean the rubber tube using an air blower.

Continuity should exist.

Continuity should exist.

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-449

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10. 

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-428, "Component Inspection"

 .

OK or NG

OK

>> GO TO 11.

NG

>> Replace EVAP canister vent control valve.

11. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-450, "Component Inspection"

 .

OK or NG

OK

>> GO TO 12.

NG

>> Replace EVAP control system pressure sensor.

12. 

CHECK WATER SEPARATOR

Refer to 

EC-403, "Component Inspection"

 .

OK or NG

OK

>> GO TO 13.

NG

>> Replace water separator.

13. 

CHECK IF EVAP CANISTER SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve attached.

2.

Does water drain from the EVAP canister.

Yes or No

Yes

>> GO TO 14.

No

>> GO TO 16.

14. 

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve attached.
The weight should be less than 1.8 kg (4.0 lb).

OK or NG

OK

>> GO TO 16.

NG

>> GO TO 15.

15. 

DETECT MALFUNCTIONING PART

Check the following.

●

EVAP canister for damage

●

EVAP hose between EVAP canister and water separator for clogging or poor connection

>> Repair hose or replace EVAP canister.

16. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

SEF596U

EC-450

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR

Component Inspection

NBS001XU

EVAP CONTROL SYSTEM PRESSURE SENSOR

1.

Remove EVAP control system pressure sensor with its harness connector connected.

2.

Remove hose from EVAP control system pressure sensor.

3.

Install a vacuum pump to EVAP control system pressure sensor.

4.

Turn ignition switch ON.

5.

Use pump to apply vacuum and pressure to EVAP control sys-
tem pressure sensor as shown in figure.

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).

6.

Check voltage between ECM terminal 32 and ground with CON-
SULT-II or tester.

CAUTION:

Discard any EVAP control system pressure sensor which has dropped from a height of more than
0.5 m (19.7 in) onto a hard surface such a concrete floor; use a new one.

7.

If NG, replace EVAP control system pressure sensor.

Applied vacuum kPa

(mmHg, inHg)

Voltage V

Not applied

1.8 - 4.8

-26.7 (-200 mmHg, -7.87)

2.1 to 2.5V lower than above value

PBIB1173E