Infiniti G35 (V35) Sedan. Manual - part 538

EC-298

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace malfunctioning component.

6.

CHECK APP SENSOR

Refer to 

EC-427, "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

2.

Go to 

EC-427, "Special Repair Requirement"

.

>> INSPECTION END

8.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-298, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace EVAP control system pressure sensor.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000000956678

1.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

1.

Turn ignition switch OFF.

2.

Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.
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 harness connector and ground under the
following conditions.

CAUTION:

• Always calibrate the vacuum pump gauge when using it.
• Do not 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

ECM

Ground

Condition

[Applied vacuum kPa (kg/cm

2

, psi)]

Voltage

Connector

Terminal

M107

102

Ground

Not applied

1.8 - 4.8V

-26.7 (-0.272, -3.87)

2.1 to 2.5V lower than above value

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-299

< COMPONENT DIAGNOSIS >

[VQ35HR]

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P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

Description

INFOID:0000000000956679

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:0000000000956680

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
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-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.

5.

Make sure that “FUEL T/TMP SE” is more than 0

°

C (32

°

F).

6.

Start engine and wait at least 20 seconds.

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.)
[CKP sensor (POS) circuit is shorted.]
[CMP sensor (PHASE) (bank 2) circuit is 
shorted.]
[EVT control position sensor (bank 2) cir-
cuit is shorted.]
(Battery current sensor circuit is shorted.)
(APP sensor 2 circuit is shorted.)
(Refrigerant pressure sensor circuit is 
shorted.)

• EVAP control system pressure sensor
• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE) 

(bank 2)

• Exhaust valve timing control position sen-

sor (bank 2)

• Battery current sensor
• Accelerator pedal position sensor
• Refrigerant pressure sensor

EC-300

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

7.

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 and ground as follows.

3.

Make sure that the voltage is less than 4.2V.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Start engine and wait at least 20 seconds.

6.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-300, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000956681

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-42, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check sensor harness connector for water.

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-I

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 10.

NO

>> GO TO 4.

4.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-II

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.

ECM

Ground

Connector

Terminal

M107

106

(Fuel tank temperature sensor signal)

Ground

Water should not exist.

EVAP control system 

pressure sensor

Ground

Voltage

Connector

Terminal

B252

3

Ground

Approx. 5V

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-301

< COMPONENT DIAGNOSIS >

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Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors M7, B1
• Harness connectors B31, B251
• Harness for open between ECM and EVAP control system pressure sensor

>> Repair open circuit.

6.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-III

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

Is the inspection result normal?

YES

>> GO TO 7.

NO

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

7.

CHECK COMPONENTS

Check the following.
• Crankshaft position sensor (POS) (Refer to 

EC-257, "Component Inspection"

.)

• Camshaft position sensor (PHASE) (bank 2) (Refer to 

EC-262, "Component Inspection"

.)

• Exhaust valve timing control position sensor (bank 2) (Refer to 

EC-350, "Component Inspection"

.)

• Battery current sensor (Refer to 

EC-381, "Component Inspection"

.)

• Refrigerant pressure sensor (Refer to 

HAC-92, "Component Inspection"

.)

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace malfunctioning component.

8.

CHECK APP SENSOR

Refer to 

EC-427, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> GO TO 9.

9.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1.

Replace accelerator pedal assembly

2.

Go to 

EC-427, "Special Repair Requirement"

.

EVAP control system 

pressure sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

B252

3

M107

107

Existed

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F101

46

CKP sensor (POS)

F2

1

F102

64

CMP sensor (PHASE) (bank 2)

F18

1

EVT control position sensor (bank 2)

F19

1

Battery current sensor

E21

1

M107

103

APP sensor

E112

6

107

EVAP control system pressure sensor

B252

3

111

Refrigerant pressure sensor

E77

3