Infiniti I30 (A33). Manual — part 315
Diagnostic Procedure
=NHEC0641
1
CHECK FUEL LEVEL SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 59 and body ground. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to power.
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
1. Check the following.
I
Harness connectors F44, M46
I
Harness connectors M110, B43
I
Harness for open and short between ECM and body ground
©
Replace open circuit or short to power in harness or connectors.
3
CHECK FUEL LEVEL SENSOR
Refer to EL-162, “Fuel Level Sensor Unit Check”.
OK or NG
OK
©
GO TO 4.
NG
©
Replace fuel level sensor unit.
4
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-144.
OK or NG
©
INSPECTION END
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1464 FUEL LEVEL SENSOR CIRCUIT (GROUND SIGNAL)
Diagnostic Procedure
EC-575
SEF278X
Description
=NHEC0346
COMPONENT DESCRIPTION
NHEC0346S01
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
NHEC0346S02
SEF323U
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0347
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
VC/V BYPASS/V
I
Ignition switch: ON
OFF
On Board Diagnosis Logic
NHEC0349
Malfunction is detected when an improper voltage signal is sent to
ECM through vacuum cut valve bypass valve.
DTC P1490 VACUUM CUT VALVE BYPASS VALVE (CIRCUIT)
Description
EC-576
Possible Cause
NHEC0592
I
Harness or connectors
(The vacuum cut valve bypass valve circuit is open or shorted.)
I
Vacuum cut valve bypass valve
DTC Confirmation Procedure
NHEC0350
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:
Before performing the following procedure, confirm that bat-
tery voltage is more than 11V at idle speed.
SEF058Y
WITH CONSULT-II
NHEC0350S01
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine and wait at least 5 seconds.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-579.
WITH GST
NHEC0350S02
Follow the procedure “WITH CONSULT-II” above.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1490 VACUUM CUT VALVE BYPASS VALVE (CIRCUIT)
Possible Cause
EC-577
Wiring Diagram
NHEC0351
MEC149D
SEF634XC
DTC P1490 VACUUM CUT VALVE BYPASS VALVE (CIRCUIT)
Wiring Diagram
EC-578
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