Nissan Frontier D22. Manual — part 500
DTC P1464 FUEL LEVEL SENSOR
EC-1103
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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.
Diagnostic Procedure
UBS00DPD
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.
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
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
Refer to
DI-18, "FUEL LEVEL SENSOR UNIT CHECK"
OK or NG
OK
>> GO TO 4.
NG
>> Replace fuel level sensor unit.
4.
CHECK INTERMITTENT INCIDENT
Refer to
EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
Removal and Installation
UBS00DPE
FUEL LEVEL SENSOR
Refer to
FL-6, "FUEL LEVEL SENSOR UNIT AND FUEL PUMP ASSEMBLY"
.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
46
G
Fuel level sensor
[Ignition switch: ON]
Approximately 0 - 4.8V
Output voltage varies with fuel
level.
66
B
Fuel level sensor
ground
[Engine is running]
●
Idle speed
Approximately 0V
EC-1104
[VG33E]
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
PFP:17372
Description
UBS00DPF
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
UBS00DPG
Specification data are reference values.
On Board Diagnosis Logic
UBS00DPH
DTC Confirmation Procedure
UBS00DPI
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 that battery voltage is more than 11V at idle
speed.
SEF186S
PBIB1438E
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
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
EC-1105
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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
WITH GST
Follow the procedure “WITH CONSULT-II”.
SEF058Y
EC-1106
[VG33E]
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
Wiring Diagram
UBS00DPJ
BBWA1094E
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