Infiniti FX35 / FX45. Manual - part 397

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-349

< SERVICE INFORMATION >

[VQ35DE]

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On Board Diagnosis Logic

INFOID:0000000001326171

DTC Confirmation Procedure

INFOID:0000000001326172

NOTE:
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.

 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 “PURG VOL CN/V P1444” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with
CONSULT-III.

5.

Touch “START”.

6.

Start engine and let it idle until “TESTING” on CONSULT-III changes to “COMPLETED”. (It will take
approximately 10 seconds.)
If “TESTING” is not displayed after 5 minutes, retry from step 2.

7.

Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”. If “NG” is displayed, refer to 

EC-

351, "Diagnosis Procedure"

.

 WITH GST

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Start engine and let it idle for at least 20 seconds.

4.

Select “Service $07” with GST.

5.

If 1st trip DTC is detected, go to 

EC-351, "Diagnosis Procedure"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0443
0443

EVAP canister purge 
volume control solenoid 
valve

The canister purge flow is detected during the 
specified driving conditions, even when EVAP 
canister purge volume control solenoid valve is 
completely closed.

• EVAP control system pressure sensor
• EVAP canister purge volume control so-

lenoid valve
(EVAP canister purge volume control so-
lenoid valve is stuck open.)

• EVAP canister vent control valve
• EVAP canister
• Hoses

(Hoses are connected incorrectly or 
clogged.)

EC-350

< SERVICE INFORMATION >

[VQ35DE]

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Wiring Diagram

INFOID:0000000001326173

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.

CAUTION:

TBWM1390E

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-351

< SERVICE INFORMATION >

[VQ35DE]

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Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnosis Procedure

INFOID:0000000001326174

1.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect EVAP canister purge volume control solenoid valve
harness connector.

3.

Turn ignition switch ON.

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

45

GY

EVAP canister purge volume 
control solenoid valve

[Engine is running]
• Idle speed
• Accelerator pedal is not depressed even 

slightly, after engine starting

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]
• Engine speed is about 2,000 rpm (More than 

100 seconds after starting engine)

BATTERY VOLTAGE

(11 - 14V)

111

W/B

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch: OFF]
• For a few seconds after turning ignition 

switch OFF

0 - 1.5V

[Ignition switch: OFF]
• More than a few seconds after turning igni-

tion switch OFF

BATTERY VOLTAGE
(11 - 14V)

119

120

R
R/B

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

SEC990C

SEC991C

PBIB2097E

EC-352

< SERVICE INFORMATION >

[VQ35DE]

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

4.

Check voltage between EVAP canister purge volume control
solenoid valve terminal 1 and ground with CONSULT-III or
tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E211, M41
• Harness connectors M82, F102
• Harness for open or short between EVAP canister purge volume control solenoid valve and IPDM E/R
• Harness for open or short between EVAP canister purge volume control solenoid valve and ECM

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

3.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT

FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 45 and EVAP canister purge volume control solenoid
valve terminal 2. Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 4.

NG

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

4.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check connectors for water.

OK or NG

OK

>> GO TO 5.

NG

>> Replace EVAP control system pressure sensor.

5.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-380, "Component Inspection"

.

OK or NG

OK (With CONSULT-III)>>GO TO 6.
OK (Without CONSULT-III)>>GO TO 7.
NG

>> Replace EVAP control system pressure sensor.

6.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

 With CONSULT-III

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

3.

Start engine.

4.

Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III. Check that engine speed var-
ies according to the valve opening.

Voltage: Battery voltage

PBIB0148E

Continuity should exist.

Water should not exist.