Nissan Frontier D22. Instruction — part 349
DTC P1464 FUEL LEVEL SENSOR
EC-499
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EC
Wiring Diagram
UBS00DBY
BBWA1066E
EC-500
[KA24DE]
DTC P1464 FUEL LEVEL SENSOR
Diagnostic Procedure
UBS00DBZ
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 66 and body ground.
Refer to Wiring Diagram.
4.
Also check harness for short to power.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F36, M81
●
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
DI-18, "FUEL LEVEL SENSOR UNIT CHECK"
.
OK or NG
OK
>> GO TO 4.
NG
>> Replace fuel level sensor unit.
4.
CHECK INTERMITTENT INCIDENT
EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
OK or NG
>> INSPECTION END.
Removal and Installation
UBS00DC0
FUEL LEVEL SENSOR UNIT
FL-6, "FUEL LEVEL SENSOR UNIT AND FUEL PUMP ASSEMBLY"
.
Continuity should exist.
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
EC-501
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EC
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
PFP:17372
Description
UBS00DC1
COMPONENT DESCRIPTION
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
CONSULT-II Reference Value in Data Monitor Mode
UBS00DC2
Specification data are reference values.
On Board Diagnosis Logic
UBS00DC3
SEF186S
PBIB1402E
MONITOR ITEM
CONDITION
SPECIFICATION
VC/V BYPASS/V
●
Ignition switch: ON
OFF
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1490
Vacuum cut valve
bypass valve circuit
An improper voltage signal is sent to ECM
through vacuum cut valve bypass valve.
●
Harness or connectors
(The vacuum cut valve bypass valve cir-
cuit is open or shorted)
●
Vacuum cut valve bypass valve
EC-502
[KA24DE]
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
DTC Confirmation Procedure
UBS00DC4
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is more than 11V at idle.
WITH CONSULT-II
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
EC-504, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II”.
SEF058Y
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