Infiniti G20 (P11). Manual — part 289
6
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors T19, T20
I
Harness connectors T1, B113
I
Harness connectors B120, B10
I
Harness connectors B3, M8
I
Harness connectors M49, F23
I
Harness for open or short between vacuum cut valve bypass valve and ECM
©
Repair open circuit or short to ground or short to power in harness or connectors.
7
CHECK VACUUM CUT VALVE BYPASS VALVE
With CONSULT-II
1. Reconnect harness disconnected connectors.
2. Turn ignition switch ON.
3. Perform “VC/V BYPASS/V” in “ACTIVE TEST” mode.
4. Check air passage continuity and operation delay time under the following conditions.
SEF807Y
Without CONSULT-II
Check air passage continuity and operation delay time under the following conditions.
SEF557Y
OK or NG
OK
©
GO TO 8.
NG
©
Replace vacuum cut valve bypass valve.
8
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-146.
©
INSPECTION END
GI
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MT
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BT
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IDX
DTC P1490 VACUUM CUT VALVE BYPASS VALVE (CIRCUIT)
Diagnostic Procedure (Cont’d)
EC-567
SEF861X
Description
NCEC0630
COMPONENT DESCRIPTION
NCEC0630S01
The vacuum cut valve and vacuum cut valve bypass valve are
installed in parallel on the EVAP purge line between the fuel tank
and the EVAP canister.
The vacuum cut valve prevents the intake manifold vacuum from
being applied to the fuel tank.
The vacuum cut valve bypass valve is a solenoid type valve and
generally remains closed. It opens only for on board diagnosis.
The vacuum cut valve bypass valve responds to signals from the
ECM. When the ECM sends an ON (ground) signal, the valve is
opened. The vacuum cut valve is then bypassed to apply intake
manifold vacuum to the fuel tank.
EVAPORATIVE EMISSION SYSTEM DIAGRAM
NCEC0630S02
SEF323U
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0631
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
VC/V BYPASS/V
I
Ignition switch: ON
OFF
ECM Terminals and Reference Value
NCEC0662
Specification data are reference values and are measured between each terminal and ground.
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.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
2
PU/R
Vacuum cut valve
bypass valve
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Description
EC-568
On Board Diagnosis Logic
NCEC0632
Malfunction is detected when vacuum cut valve bypass valve does
not operate properly.
Possible Cause
NCEC0633
I
Vacuum cut valve bypass valve
I
Vacuum cut valve
I
Bypass hoses for clogging
I
EVAP control system pressure sensor and circuit
I
EVAP canister vent control valve
I
Hose between fuel tank and vacuum cut valve clogged
I
Hose between vacuum cut valve and EVAP canister clogged
I
EVAP canister
I
EVAP purge port of fuel tank for clogging
SEF210Y
SEF211Y
SEF239Y
DTC Confirmation Procedure
NCEC0634
CAUTION:
Always drive vehicle at a safe speed.
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:
Always perform test at a temperature of 5 to 30°C (41 to 86°F).
WITH CONSULT-II
NCEC0634S01
1)
Turn ignition switch “ON”.
2)
Start engine and warm it up to normal operating temperature.
3)
Turn ignition switch “OFF” and wait at least 10 seconds.
4)
Start engine and let it idle for at least 70 seconds.
5)
Select “VC CUT/V BP/V P1491” of “EVAPORATIVE SYSTEM”
in “DTC WORK SUPPORT” mode with CONSULT-II.
6)
Touch “START”.
7)
When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions
continuously until “TESTING” changes to “COMPLETED”. (It
will take at least 30 seconds.)
ENG SPEED
More than 1,000 rpm
Selector lever
Suitable position
Vehicle speed
More than 37 km/h (23 MPH)
B/FUEL SCHDL
1.0 – 8.9 msec
If “TESTING” is not displayed after 5 minutes, retry from
step 3.
8)
Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”.
If
“NG”
is
displayed,
refer
to
“Diagnostic
Procedure”, EC-572.
GI
MA
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LC
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MT
AT
AX
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ST
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BT
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EL
IDX
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
On Board Diagnosis Logic
EC-569
SEF530Q
Overall Function Check
NCEC0635
Use this procedure to check the overall function of vacuum cut
valve bypass valve. During this check, the 1st trip DTC might not
be confirmed.
WITH GST
NCEC0635S01
1)
Remove vacuum cut valve and vacuum cut valve bypass valve
as an assembly.
2)
Apply vacuum to port A and check that there is no suction from
port B.
3)
Apply vacuum to port B and check that there is suction from
port A.
4)
Blow air in port B and check that there is a resistance to flow
out of port A.
5)
Supply battery voltage to the terminal.
6)
Blow air in port A and check that air flows freely out of port B.
7)
Blow air in port B and check that air flows freely out of port A.
8)
If NG, go to “Diagnostic Procedure”, EC-572.
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Overall Function Check
EC-570
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