Nissan Maxima. Manual - part 465

EC-344

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

3.

PERFORM DTC CONFIRMATION PROCEDURE-2

With CONSULT

1. Select “EVAP DIAG READY” in “DATA MONITOR” mode of “ENGINE”.

2. Let it idle until “OFF” of “EVAP DIAG READY” changes to “ON”.

NOTE:

It will take at most 2 hours until “OFF” of “EVAP DIAG READY” changes to “ON”.

3. Turn ignition switch OFF and wait at least 90 minutes.

NOTE:

Never turn ignition switch ON during 90 minutes.

4. Turn ignition switch ON.

5. Select “EVAP LEAK DIAG” in “DATA MONITOR” mode of “ENGINE”.

6. Check that “EVAP LEAK DIAG” indication.
Which is displayed on CONSULT?

CMPLT >> GO TO 4.

YET

>> 1. Perform DTC CONFIRMATION PROCEDURE again.

2. GO TO 1.

4.

PERFORM DTC CONFIRMATION PROCEDURE-3

With CONSULT

Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-344, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM DTC CONFIRMATION PROCEDURE-4

With GST

1. Start engine and let it idle for least 40 seconds.

NOTE:

Do not depress accelerator pedal even slightly.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-344, "Diagnosis Procedure"

.

NO

>> GO TO 6.

6.

PERFORM DTC CONFIRMATION PROCEDURE-5

With GST

1. Let it idle for at least 2 hours.

2. Turn ignition switch OFF and wait at least 90 minutes.

NOTE:

Never turn ignition switch ON during 90 minutes.

3. Turn ignition switch ON.

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-344, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010095026

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

1.

CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in 

GI-44, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-345

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1. Disconnect EVAP control system pressure sensor harness connector.

2. Check that water is not inside connectors.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness connector.

3.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT

1. Turn ignition switch ON.

2. Check the voltage between EVAP control system pressure sen-

sor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 4.

4.

CHECK SENSOR POWER SUPPLY CIRCUIT

Check harness for short to power and short to ground, between the following terminals.

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK COMPONENTS

Check the following.

• Crankshaft position sensor (POS) (Refer to 

EC-299, "Component Inspection"

.)

• Refrigerant pressure sensor (Refer to 

EC-515, "Diagnosis Procedure"

.)

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace malfunctioning components.

6.

CHECK APP SENSOR

Refer to 

EC-469, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 7.

7.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly. Refer to 

ACC-3, "Removal and Installation"

.

2. Go to 

EC-469, "Special Repair Requirement"

.

>> INSPECTION END

8.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-346, "Component Inspection"

.

Is the inspection result normal?

EVAP control system pressure sensor

Ground

Voltage (V)

Connector

Terminal

B41

3

Ground

Approx. 5

PBIB0138E

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F13

72

Refrigerant pressure sensor

E219

1

76

CKP sensor (POS)

F30

1

E10

87

APP sensor

E40

6

91

EVAP control system pressure sensor

B41

3

EC-346

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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

YES

>> GO TO 9.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-17, "Removal and Installation"

.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000010095027

1.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Turn ignition switch OFF.

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

Always replace O-ring with a new one.

3. Install a vacuum pump to EVAP control system pressure sensor.

4. Turn ignition switch ON and check output voltage between ECM

terminals under the following conditions.

CAUTION:

• Always calibrate the vacuum pump gauge when using it.
• 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).

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-17, "Removal and Installation"

.

ECM

Applied vacu-

um kPa

(kg/cm

2

, psi)

Voltage

Con-

nector

+

–

Terminal

Terminal

E10

86

(EVAP control 

system pressure 

sensor signal)

96

(Sensor 
ground)

Not applied

1.8 - 4.8 V

-26.7 (-0.272, 

-3.87)

2.1 to 2.5 V lower 
than above value

JMBIA1871ZZ

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-347

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P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

Description

INFOID:0000000010095028

The EVAP control system pressure sensor detects pressure in the

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

sure increases.

DTC Logic

INFOID:0000000010095029

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

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

ing the next test.

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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

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.

5. Turn ignition switch ON.

6. Select “DATA MONITOR” mode with CONSULT.

7. Check that “FUEL T/TMP SE” is more than 0

°C (32°F).

8. Start engine and wait at least 20 seconds.

9. Check 1st trip DTC.

With GST

PBIB3370E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0452

EVAP control system 
pressure sensor low in-
put

An excessively low voltage from the sensor is 
sent to ECM.

• Harness or connectors

(EVAP control system pressure sensor 
circuit is open or shorted.)
[Crankshaft position (CKP) sensor (POS) 
circuit is shorted.]
[Accelerator pedal position (APP) sensor 
2 circuit is shorted.]
(Refrigerant pressure sensor circuit is 
shorted.)

• EVAP control system pressure sensor
• CKP sensor (POS)
• APP sensor
• Refrigerant pressure sensor