Nissan Xterra. Manual - part 298

EC-318

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

2. Loosen and retighten three ground screws on the body. Refer to 

EC-152, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK EVPA CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER

1. Disconnect EVAP control system pressure sensor (2) harness

connector.

-

Fuel filler pipe (1)

-

EVAP canister vent control valve (3)

-

EVAP canister (4)

-

Drain filter (5)

-

: Vehicle front

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-318, "Component Inspection"

.

OK or NG

OK

>> GO TO 4.

NG

>> Replace EVAP control system pressure sensor. Refer to 

FL-16, "Removal and Installation"

.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009484024

EVAP CONTROL SYSTEM PRESSURE SENSOR

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

Do not reuse the O-ring, replace it 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 102 and ground under the fol-

lowing conditions.

CAUTION:

• Always calibrate the vacuum pump gauge when using it.

BBIA0539E

Water should not exist.

AWBIA0223ZZ

Applied vacuum kPa

(kg/cm

2

 psi)

Voltage V

Not applied

1.8 - 4.8

-26.7 (-0.272, -3.87)

2.1 to 2.5V lower than above value

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-319

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

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• 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).

4. If NG, replace EVAP control system pressure sensor.

EC-320

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

Component Description

INFOID:0000000009484025

The EVAP control system pressure sensor (2) detects pressure in

the purge line. The sensor output voltage to the ECM increases as

pressure increases.

• EVAP canister vent control valve (3)

• EVAP canister (4)

• Drain filter (5)
•

: Vehicle front

On Board Diagnosis Logic

INFOID:0000000009484026

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

EC-366

.

DTC Confirmation Procedure

INFOID:0000000009484027

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next step.

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.

TESTING CONDITION:

Always perform test at a temperature of 5

°C (41°F) or more.

 WITH CONSULT

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. Turn ignition switch OFF and wait at least 10 seconds and then turn ON.
5. Select “DATA MONITOR” mode with CONSULT.
6. Make sure that “FUEL T/TMP SE” is more than 0

°C (32°F).

7. Start engine and wait at least 20 seconds.
8. Check 1st trip DTC.

AWBIA0223ZZ

PBIB3370E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0452
0452

EVAP control system 
pressure sensor low in-
put

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

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-321

< DTC/CIRCUIT DIAGNOSIS >

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9. If 1st trip DTC is detected, go to 

EC-321, "Diagnosis Procedure"

.

 WITH GST

1. Start engine and warm it up to normal operating temperature.
2. Check that voltage between ECM terminal 111 (Fuel tank temperature sensor signal) and ground is less

than 4.2V.

3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start engine and wait at least 20 seconds.
7. Select Service $07 with GST.

If 1st trip DTC is detected, go to 

EC-321, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009484028

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body. Refer to 

EC-152, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK CONNECTOR

1. Disconnect EVAP control system pressure sensor (2) harness

connector.

-

Fuel filler pipe (1)

-

EVAP canister vent control valve (3)

-

EVAP canister (4)

-

Drain filter (5)

-

: Vehicle front

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 3 and ground with CONSULT or

tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

BBIA0539E

Water should not exist.

AWBIA0223ZZ

Voltage: Approximately 5V