Nissan Titan A60. Manual - part 408

EC-298

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

Component Description

INFOID:0000000006158727

The EVAP control system pressure sensor (2) detects pressure in the purge line. The sensor output voltage to

the ECM increases as pressure increases.

On Board Diagnosis Logic

INFOID:0000000006158728

NOTE:

If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-345

.

DTC Confirmation Procedure

INFOID:0000000006158729

1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-

ducting the next step.

a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c.

Turn ignition switch OFF and wait at least 10 seconds.

2. Start engine and wait at least 40 seconds.

NOTE:

Do not depress accelerator pedal even slightly.

3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to 

EC-298, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006158730

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

1

: Drain filter

3

:  EVAP  canister

4

: EVAP canister vent control value

ALBIA0401ZZ

PBIB1207E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0451
0451

EVAP control system pressure 
sensor performance

ECM detects a sloshing signal from the 
EVAP control system pressure sensor

• Harness or connectors
• EVAP control system pressure sensor

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-299

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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

Refer to 

EC-139, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER

1. Disconnect EVAP control system pressure sensor (2) 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

Refer to 

EC-299, "Component Inspection"

.

OK or NG

OK

>> GO TO 4.

NG 

>> Replace EVAP control system pressure sensor.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "How to Check Terminal"

 and 

GI-39, "Intermittent Incident"

.

For wiring diagram, refer to 

EC-83, "Wiring Diagram"

.

>> INSPECTION END

Component Inspection

INFOID:0000000006158731

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.

BBIA0354E

1

: Drain filter

3

: EVAP canister

4

: EVAP canister vent control value

Water should not exist.

ALBIA0401ZZ

EC-300

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P0451 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.

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

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-301

< DTC/CIRCUIT DIAGNOSIS >

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P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

Component Description

INFOID:0000000006158732

The EVAP control system pressure sensor (2) detects pressure in the purge line. The sensor output voltage to

the ECM increases as pressure increases.

On Board Diagnosis Logic

INFOID:0000000006158733

NOTE:

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

EC-345

.

DTC Confirmation Procedure

INFOID:0000000006158734

NOTE:

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

ing the next step. 
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
TESTING CONDITION:

Always perform test at a temperature of 5

°C (41°F) or more.

 WITH CONSULT-III

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-III.

1

: Drain filter

3

: EVAP canister

4

: EVAP canister vent control value

ALBIA0401ZZ

PBIB1207E

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 sen-
sor is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• EVAP control system pressure sensor