Infiniti Q45 (FY33). Manual - part 232

Evaporative Emission (EVAP) Control System
Purge Flow Monitoring

NOTE: If DTC P1447 is displayed with P0510, perform TROUBLE DIAGNOSIS FOR DTC P0510 first.

SEF850U

SYSTEM DESCRIPTION

In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions.
Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP
canister purge volume control valve and EVAP canister purge control valve are open. Purge flow exposes the
EVAP control system pressure sensor to intake manifold vacuum.

ON BOARD DIAGNOSIS LOGIC

Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow
are adequate. If not, a fault is determined.

Diagnostic

Trouble Code

No.

Malfunction is detected when ....

Check Items

(Possible Cause)

P1447
0111

EVAP control system does not operate properly.

EVAP control system has a leak between intake mani-
fold and EVAP control system pressure sensor.

EVAP canister purge volume control valve stuck
closed

EVAP canister purge control valve stuck closed

EVAP control system pressure sensor

Loose, disconnected or improper connection of rubber
tube

Blocked rubber tube

EVAP canister purge control solenoid valve

Blocked or bent rubber tube to MAP/BARO switch
solenoid valve

Cracked EVAP canister

EVAP canister purge volume control valve

Closed throttle position switch

Improper connection of one-way valve

Blocked purge port

EVAP canister vent control valve

IDX

TROUBLE DIAGNOSIS FOR DTC P1447

EC-457

SEF809X

SEF811X

SEF810X

SEF812X

SEC054C

DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.
NOTE:

If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PRO-
CEDURE” has been previously conducted, always turn
ignition switch “OFF” and wait at least 5 seconds before
conducting the next test.

TESTING CONDITION:

Always perform test at temperature above 0°C (32°F).

1) Start engine and warm it up to normal operating tem-

perature.

2) Turn ignition switch “OFF” and wait at least 5 seconds.
3) Start engine (TCS switch “OFF”) and let it idle for at

least 90 seconds.

4) Select “PURG CN/V & S/V P1493” of “EVAPORATIVE

SYSTEM” in “DTC WORK SUPPORT” mode with CON-
SULT-II.

5) Touch “START”.
6) When the following conditions are met, “TESTING” will

be displayed on the CONSULT-II screen. Maintain the
conditions continuously until “TESTING” changes to
“COMPLETED”. (It will take at least 30 seconds.)
CMPS-RPM (POS): 900 - 6,300 rpm
Vehicle speed: 36 - 120 km/h (22 - 75 MPH)
B/FUEL SCHDL: 2 - 4.8 msec
Selector lever: Suitable position

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 “DIAG-
NOSTIC PROCEDURE”, EC-491.

8) Select “PURG VOL C/V P1444” of “EVAPORATIVE

SYSTEM” in “DTC WORK SUPPORT” mode with CON-
SULT-II.

9) Touch “START”.

If “COMPLETED” is displayed, go to 11).

10) When the following conditions are met, “TESTING” will

be displayed on the CONSULT-II screen. Maintain the
conditions continuously until “TESTING” changes to
“COMPLETED”. (It will take at least 20 seconds.)
CMPS-RPM (POS): 900 - 6,300 rpm
Vehicle speed: 36 - 120 km/h (22 - 75 MPH)
B/FUEL SCHDL: 2 - 4.8 msec
Selector lever: Suitable position

If “TESTING” is not displayed after 5 minutes, retry
from step 2).
11) Make sure that “OK” is displayed after touching “SELF-

DIAG RESULTS”. If “NG” is displayed, refer to “DIAG-
NOSTIC PROCEDURE” of “TROUBLE DIAGNOSIS
FOR DTC P1444”, EC-448.

12) Select “PURG FLOW P1447” of “EVAPORATIVE SYS-

TEM” in “DTC CONFIRMATION” mode with CONSULT-
II.

13) Touch “START”.
14) When the following conditions are met, “TESTING” will

be displayed on the CONSULT-II screen. Maintain the

TROUBLE DIAGNOSIS FOR DTC P1447

Evaporative Emission (EVAP) Control System
Purge Flow Monitoring (Cont’d)

EC-458

SEC055C

SEF238Y

conditions continuously until “TESTING” changes to
“COMPLETED”. (It will take at least 35 seconds.)
CMPS-RPM (POS): 900 - 6,300 rpm
Vehicle speed: 36 - 120 km/h (22 - 75 MPH)
Selector lever: Suitable position

If “TESTING” is not displayed after 5 minutes, retry
from step 2).
15) Make sure that “OK” is displayed after touching “SELF-

DIAG RESULTS”. If “NG” is displayed, refer to “DIAG-
NOSTIC PROCEDURE”, EC-460.

SEF360W

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

OVERALL FUNCTION CHECK

Use this procedure to check the overall monitoring function of the
EVAP control system purge flow. During this check, a 1st trip DTC
might not be confirmed.

1) Start engine (TCS switch “OFF”) and warm it up to nor-

mal operating temperature.

2) Turn ignition switch “OFF”, wait at least 5 seconds.
3) Start engine and wait at least 70 seconds.
4) Set voltmeter probes to ECM terminals

(EVAP con-

trol system pressure sensor signal) and

128

(ECM

ground).

5) Check EVAP control system pressure sensor value at

idle speed.

6) Establish and maintain the following conditions for at

least 1 minute.
Air conditioner switch: ON
Steering wheel: Fully turned
Headlamp switch: ON
Rear window defogger switch: ON
Engine speed: Approx. 3,000 rpm
Gear position:

Any position other than “P”, “N” or “R”

Verify that EVAP control system pressure sensor value
stays 0.1V less than the value at idle speed for at least
1 second.

7) If NG, go to “DIAGNOSTIC PROCEDURE”, EC-460.

IDX

TROUBLE DIAGNOSIS FOR DTC P1447

Evaporative Emission (EVAP) Control System
Purge Flow Monitoring (Cont’d)

EC-459

SEF622U

SEF765X

SEF621U

SEF368U

SEF593U

DIAGNOSTIC PROCEDURE

INSPECTION START

CHECK EVAP CANISTER.
Check EVAP canister for cracks.

Replace EVAP canister.

CHECK PURGE FLOW.

1. Disconnect vacuum hose from

EVAP canister purge control
valve and install vacuum gauge.

2. Start engine and let it idle.
3. Perform “PURG VOL CONT/V”

in “ACTIVE TEST” mode.

4. Rev engine up to 2,000 rpm.
5. Select “ON” and “OFF” on CON-

SULT-II screen to turn on
“PURG CONT/V S/V”.
ON: Vacuum should exist.
OFF: Vacuum should not

exist.

-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------

1. Start engine and warm it up to

normal operating temperature.

2. Stop engine.
3. Disconnect vacuum hose from

EVAP canister purge control
valve and install vacuum gauge.

4. Start engine and let it idle for at

least 60 seconds.

5. Check vacuum hose for vacuum

when revving engine up to
2,000 rpm.
While operating solenoid
valve, vacuum should exist.

6. Release the accelerator pedal

and let idle.
Vacuum should not exist.

CHECK EVAP PURGE
LINE.
Check EVAP purge line for
improper connection, dis-
connection and blocked
purge port.
1. Turn ignition switch

“OFF”.

2. Disconnect purge hoses

connected to EVAP can-
ister purge control valve
(

) and EVAP canister

purge volume control
valve (

3. Blow air into each hose

and make sure air flows
freely.

4. Check EVAP purge port

5. Check improper connec-

tion of one-way valve.

If NG, reconnect one-way
valve properly or repair or
clean hoses and/or purge
port.

CHECK ONE-WAY VALVE.
1. Check for improper con-

nection.

2. Check component.

Refer to EC-393.

CHECK COMPONENTS
(EVAP canister purge vol-
ume control solenoid
valve).
Refer to “COMPONENT
INSPECTION”, EC-462.

CHECK COMPONENT
(EVAP canister purge volume control
valve).
Refer to “COMPONENT INSPECTION”,
EC-462.

Replace EVAP canister
purge volume control
valve.

(Go to next page.)

TROUBLE DIAGNOSIS FOR DTC P1447

Evaporative Emission (EVAP) Control System
Purge Flow Monitoring (Cont’d)

EC-460

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