Infiniti M35/M45 Y50. Manual - part 484

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID 

VALVE

EC-409

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

On Board Diagnosis Logic

NBS004ZY

DTC Confirmation Procedure

NBS004ZZ

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:
Before performing the following procedure, confirm battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and let it idle for at least 13 seconds.

4.

If 1st trip DTC is detected, go to 

EC-412, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above. 

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0444
0444

EVAP canister purge volume 
control solenoid valve circuit 
open

An excessively low voltage signal is sent 
to ECM through the valve

●

Harness or connectors
(The solenoid valve circuit is open or 
shorted.)

●

EVAP canister purge volume control 
solenoid valve

P0445
0445

EVAP canister purge volume 
control solenoid valve circuit 
shorted

An excessively high voltage signal is sent 
to ECM through the valve

●

Harness or connectors
(The solenoid valve circuit is shorted.)

●

EVAP canister purge volume control 
solenoid valve

SEF058Y

EC-410

[VQ35DE]

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID 

VALVE

Wiring Diagram

NBS00500

TBWT0964E

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID 

VALVE

EC-411

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

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

CAUTION:

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.)

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

45

V

EVAP canister purge vol-
ume control solenoid valve

[Engine is running]

●

Idle speed

●

Accelerator pedal: Not depressed even 
slightly, after engine starting

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

●

Engine speed: About 2,000 rpm (More than 
100 seconds after starting engine)

BATTERY VOLTAGE

(11 - 14V)

111

SB

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

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

SEC990C

SEC991C

EC-412

[VQ35DE]

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID 

VALVE

Diagnostic Procedure

NBS00501

1. 

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIR-

CUIT

1.

Turn ignition switch OFF.

2.

Disconnect EVAP canister purge volume control solenoid valve
harness connector.

3.

Turn ignition switch ON.

4.

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

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E108, M15

●

Harness connectors M72, 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 CIR-

CUIT 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 (With CONSULT-II)>>GO TO 4.
OK (Without CONSULT-II)>>GO TO 5.
NG

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

PBIB2006E

Voltage: Battery voltage

PBIB0148E

Continuity should exist.