Infiniti Q45. Manual - part 444

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID 

VALVE

EC-415

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

L/Y

EVAP canister purge vol-
ume control solenoid valve

[Engine is running]

●

Idle speed

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

●

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

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

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

PBIB0050E

PBIB0051E

EC-416

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID 

VALVE

Diagnostic Procedure

NBS001X7

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 M135, F105

●

Harness for open or short between EVAP canister purge volume control solenoid valve and ECM relay

●

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.

PBIB3130E

Voltage: Battery voltage

PBIB0148E

Continuity should exist.

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID 

VALVE

EC-417

C

D

E

F

G

H

I

J

K

L

M

A

EC

4. 

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

 With CONSULT-II

1.

Reconnect all harness connectors disconnected.

2.

Start engine.

3.

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

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-417, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace EVAP canister purge volume control solenoid valve.

6. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

NBS001X8

EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

 With CONSULT-II

Check air passage continuity of EVAP canister purge volume control
solenoid valve under the following conditions.

 Without CONSULT-II

Check air passage continuity of EVAP canister purge volume control
solenoid valve under the following conditions.

PBIB1678E

Condition

(PURG VOL CONT/V value)

Air passage continuity 

between A and B

100%

Yes

0%

No

PBIB0149E

Condition

Air passage continuity 

between A and B

12V direct current supply between 
terminals 1 and 2

Yes

No supply

No

PBIB0150E

EC-418

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID 

VALVE

Removal and Installation

NBS001X9

EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EM-19, "INTAKE MANIFOLD"

 .