Nissan Pathfinder. Manual - part 502

 

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Nissan Pathfinder. Manual - part 502

 

 

EC-314

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

4.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between EVAP control system pressure sensor harness connector and ECM har-

ness connector.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Check EVAP control system pressure sensor. Refer to 

EC-315, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-18, "Removal and Installation"

.

Component Inspection

INFOID:0000000009178220

1.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Turn ignition switch OFF.

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

FL-18, "Removal and

Installation"

.

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-18, "Removal and Installation"

.

EVAP control system pressure 

sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

B36

1

E16

112

Existed

ECM

Applied vacuum kPa

(kg/cm

2

, psi)

Voltage

Connector

+

–

Terminal

Terminal

E16

102

112

Not applied

1.8 - 4.8 V

-26.7 (-0.272, -3.87)

2.1 to 2.5 V lower than 

above value

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-315

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

DTC Logic

INFOID:0000000009178221

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

1. Start engine and warm it up to normal operating temperature.

2. Set voltmeter probes to ECM harness connector terminals under the following conditions.

3. Check that the voltage is less than 4.2 V.

4. Turn ignition switch OFF and wait at least 10 seconds.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0452

EVAP SYS PRES SEN
(Evaporative emission system 
pressure sensor/switch low)

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

• Harness or connectors

(EVAP control system pressure sensor 
circuit is open or shorted.)
[CKP sensor (POS) circuit is shorted.]
(APP sensor 2 circuit is shorted.)
(Refrigerant pressure sensor circuit is 
shorted.)
(Engine oil pressure sensor circuit is 
shorted.)

• EVAP control system pressure sensor
• Crankshaft position sensor (POS)
• Accelerator pedal position sensor
• Refrigerant pressure sensor
• Engine oil pressure sensor
• Sensor power supply 2 circuit

ECM

Connector

+

–

Terminal

E16

111

120

EC-316

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

5. Turn ignition switch ON.

6. Turn ignition switch OFF and wait at least 10 seconds.

7. Start engine and wait at least 20 seconds.

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

YES

>> Proceed to 

EC-317, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009178222

1.

CHECK CONNECTOR

1. Disconnect EVAP control system pressure sensor harness connector.

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

YES

>> GO TO 2.

NO

>> Repair or replace harness connector.

2.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY

1. Turn ignition switch ON.

2. Check the voltage between EVAP control system pressure sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 3.

3.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between EVAP control system pressure sensor harness connector and ECM har-

ness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness connector.

4.

CHECK SENSOR POWER SUPPLY 2 CIRCUIT

Check sensor power supply 2 circuit. Refer to 

EC-450, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

5.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between EVAP control system pressure sensor harness connector and ECM har-

ness connector.

EVAP control system pressure sensor

Ground

Voltage (V)

Connector

Terminal

B36

3

Ground

Approx. 5

EVAP control system pressure sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

B36

3

E16

107

Existed

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-317

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

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J

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M

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EC

N

P

O

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 6.

NO

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

6.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT

1. Check the continuity between EVAP control system pressure sensor harness connector and ECM har-

ness connector.

2. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 7.

NO

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

7.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Check EVAP control system pressure sensor. Refer to 

EC-318, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-18, "Removal and Installation"

.

Component Inspection

INFOID:0000000009178223

1.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Turn ignition switch OFF.

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

FL-18, "Removal and

Installation"

.

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-18, "Removal and Installation"

.

EVAP control system pressure sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

B36

1

E16

112

Existed

EVAP control system pressure sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

B36

2

E16

102

Existed

ECM

Applied vacuum kPa

(kg/cm

2

, psi)

Voltage

Connector

+

–

Terminal

Terminal

E16

102

112

Not applied

1.8 - 4.8 V

-26.7 (-0.272, -3.87)

2.1 to 2.5 V lower than 

above value

 

 

 

 

 

 

 

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