Infiniti QX4 (R50). Manual — part 274
SEF355X
Overall Function Check
NBEC0336
Use this procedure to check the overall monitoring function of the
EVAP control system purge flow monitoring. During this check, a
1st trip DTC might not be confirmed.
WITH GST
NBEC0336S01
1)
Lift up drive wheels.
2)
Start engine (TCS switch “OFF”) and warm it up to normal
operating temperature.
3)
Turn ignition switch “OFF”, wait at least 10 seconds.
4)
Start engine and wait at least 70 seconds.
5)
Set voltmeter probes to ECM terminals 84 (EVAP control sys-
tem pressure sensor signal) and ground.
6)
Check EVAP control system pressure sensor value at idle
speed and note it.
7)
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”
8)
Verify that EVAP control system pressure sensor value stays
0.1V less than the value at idle speed (measured at step 6) for
at least 1 second.
9)
If NG, go to “Diagnostic Procedure”, EC-564.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1447 EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM PURGE
FLOW MONITORING
Overall Function Check
EC-563
Diagnostic Procedure
=NBEC0337
1
CHECK EVAP CANISTER
1. Turn ignition switch “OFF”.
2. Check EVAP canister for cracks.
OK or NG
OK (With CONSULT-II)
©
GO TO 2.
OK (Without CONSULT-
II)
©
GO TO 3.
NG
©
Replace EVAP canister.
2
CHECK PURGE FLOW
With CONSULT-II
1. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP service port and
install vacuum gauge.
SEF983Y
2. Start engine and let it idle.
3. Select “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-II.
4. Rev engine up to 2,000 rpm.
5. Touch “Qd” and “Qu” on CONSULT-II screen to adjust “PURG VOL CONT/V” opening and check vacuum existence.
SEF012Z
OK or NG
OK
©
GO TO 7.
NG
©
GO TO 4.
DTC P1447 EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM PURGE
FLOW MONITORING
Diagnostic Procedure
EC-564
3
CHECK PURGE FLOW
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine.
3. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP service port and
install vacuum gauge.
SEF983Y
4. Start engine and let it idle for at least 80 seconds.
5. Check vacuum gauge indication when revving engine up to 2,000 rpm.
Vacuum should exist.
6. Release the accelerator pedal fully and let idle.
Vacuum should not exist.
OK or NG
OK
©
GO TO 7.
NG
©
GO TO 4.
4
CHECK EVAP PURGE LINE
1. Turn ignition switch “OFF”.
2. Check EVAP purge line for improper connection or disconnection.
Refer to “EVAPORATIVE EMISSION LINE DRAWING”, EC-36.
OK or NG
OK (With CONSULT-II)
©
GO TO 5.
OK (Without CONSULT-
II)
©
GO TO 6.
NG
©
Repair it.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1447 EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM PURGE
FLOW MONITORING
Diagnostic Procedure (Cont’d)
EC-565
5
CHECK EVAP PURGE HOSE AND PURGE PORT
1. Disconnect purge hoses connected to EVAP service port A and EVAP canister purge volume control solenoid valve B.
SEF367U
2. Blow air into each hose and EVAP purge port C.
3. Check that air flows freely.
SEF368U
OK or NG
OK
©
GO TO 6.
NG
©
Repair or clean hoses and/or purge port.
6
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT-II
1. Start engine.
2. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-II. Check that engine speed varies according
to the valve opening.
SEF985Y
OK or NG
OK
©
GO TO 8.
NG
©
GO TO 7.
DTC P1447 EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM PURGE
FLOW MONITORING
Diagnostic Procedure (Cont’d)
EC-566
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