Infiniti QX4 (R50). Manual — part 283
9
CHECK VACUUM CUT VALVE
Check vacuum cut valve as follows:
SEF379Q
a. Plug port C and D with fingers.
b. Apply vacuum to port A and check that there is no suction from port B.
c. Apply vacuum to port B and check that there is suction from port A.
d. Blow air in port B and check that there is a resistance to flow out of port A.
e. Open port C and D.
f. Blow air in port A check that air flows freely out of port C.
g. Blow air in port B check that air flows freely out of port D.
OK or NG
OK
©
GO TO 10.
NG
©
Replace vacuum cut valve.
10
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE
1. Turn ignition switch “OFF”.
2. Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.
OK or NG
OK
©
GO TO 11.
NG
©
Repair or replace.
11
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
SEF495R
2. Check connectors for water.
Water should not exist.
OK or NG
OK
©
GO TO 12.
NG
©
Replace EVAP control system pressure sensor.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Diagnostic Procedure (Cont’d)
EC-599
12
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor with its harness connector connected.
CAUTION:
I
Never apply force to the air hole protector of the sensor if equipped.
SEF799W
2. Remove hose from EVAP control system pressure sensor.
3. Turn ignition switch “ON”.
4. Use pump to apply vacuum and pressure to EVAP control system pressure sensor as shown in figure.
CAUTION:
I
Always calibrate the vacuum pump gauge when using it.
I
Do not apply below −20 kPa (−150 mmHg, −5.91 inHg) or over 20 kPa (150 mmHg, 5.91 inHg) of pressure.
5. Check input voltage between ECM terminal 84 and ground.
SEF342X
CAUTION:
I
Discard and EVAP control system pressure sensor which has been dropped from a height of more than 0.5 m
(19.7 in) onto a hard surface such as a concrete floor; use a new one.
OK or NG
OK
©
GO TO 13.
NG
©
Replace EVAP control system pressure sensor.
13
CHECK RUBBER TUBE FOR CLOGGING
1. Disconnect rubber tube connected to EVAP canister vent control valve.
2. Check the rubber tube for clogging.
OK or NG
OK
©
GO TO 14.
NG
©
Clean the rubber tube using an air blower.
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Diagnostic Procedure (Cont’d)
EC-600
14
CHECK EVAP CANISTER VENT CONTROL VALVE-I
1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion B of EVAP canister vent control valve for being rusted.
SEF337X
OK or NG
OK
©
GO TO 15.
NG
©
Replace EVAP canister vent control valve.
15
CHECK EVAP CANISTER VENT CONTROL VALVE-II
With CONSULT-II
1. Reconnect harness disconnected connectors.
2. Turn ignition switch ON.
3. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
4. Check air passage continuity and operation delay time.
SEF991Y
Without CONSULT-II
Check air passage continuity and operation delay time under the following conditions.
SEF339X
Make sure new O-ring is installed properly.
OK or NG
OK
©
GO TO 17.
NG
©
GO TO 16.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Diagnostic Procedure (Cont’d)
EC-601
16
CHECK EVAP CANISTER VENT CONTROL VALVE-III
1. Clean the air passage (Portion A to B) of EVAP canister vent control valve using an air blower.
2. Perform the Test No. 15 again.
OK or NG
OK
©
GO TO 17.
NG
©
Replace EVAP canister vent control valve.
17
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
©
INSPECTION END
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Diagnostic Procedure (Cont’d)
EC-602
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