Infiniti M45 (Y34). Manual — part 471
DTC P1456 EVAP CONTROL SYSTEM
EC-573
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EC
21.
CHECK REFUELING EVAP VAPOR LINE
Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness and
improper connection. For location, refer to
EC-698, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)"
.
OK or NG
OK
>> GO TO 22.
NG
>> Repair or replace hoses and tubes.
22.
CHECK SIGNAL LINE AND RECIRCULATION LINE
Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, loose-
ness and improper connection.
OK or NG
OK
>> GO TO 23.
NG
>> Repair or replace hoses, tubes or filler neck tube.
23.
CHECK REFUELING CONTROL VALVE
Refer to
EC-701, "Component Inspection"
OK or NG
OK
>> GO TO 24.
NG
>> Replace refueling control valve with fuel tank.
24.
CHECK FUEL LEVEL SENSOR
Refer to
DI-19, "CHECK FUEL LEVEL SENSOR UNIT"
.
OK or NG
OK
>> GO TO 25.
NG
>> Replace fuel level sensor unit.
25.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Component Inspection
ABS002VR
WATER SEPARATOR
1.
Check visually for insect nests in the water separator air inlet.
2.
Check visually for cracks or flaws in the appearance.
3.
Check visually for cracks or flaws in the hose.
4.
Check that A and C are not clogged by blowing air into B with
A , and then C plugged.
5.
In case of NG in items 2 - 4, replace the parts.
NOTE:
●
Do not disassemble water separator.
PBIB1032E
EC-574
DTC P1464 FUEL LEVEL SENSOR
DTC P1464 FUEL LEVEL SENSOR
PFP:25060
Component Description
ABS002R1
The fuel level sensor is mounted in the fuel level sensor unit. The
sensor detects a fuel level in the fuel tank and transmits a signal to
the ECM.
It consists of two parts, one is mechanical float and the other is vari-
able resistor. Fuel level sensor output voltage changes depending on
the movement of the fuel mechanical float.
On Board Diagnosis Logic
ABS002R2
ECM receives two signals from the fuel level sensor.
One is fuel level sensor power supply circuit, and the other is fuel level sensor ground circuit.
This diagnosis indicates the latter to detect open circuit malfunction.
DTC Confirmation Procedure
ABS002R3
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.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Wait at least 5 seconds.
4.
If 1st trip DTC is detected, go to
EC-576, "Diagnostic Procedure"
.
WITH GST
Follow the procedure WITH CONSULT-II above.
PBIB1241E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1464
1464
Fuel level sensor circuit
ground signal
A high voltage from the sensor is sent to ECM.
●
Harness or connectors
(The sensor circuit is open or shorted)
SEF195Y
DTC P1464 FUEL LEVEL SENSOR
EC-575
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EC
Wiring Diagram
ABS002R4
TBWA0295E
EC-576
DTC P1464 FUEL LEVEL SENSOR
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
ABS002R5
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK FUEL LEVEL SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Disconnect combination meter harness connector.
3.
Check harness continuity between ECM terminal 107 and combination meter terminal 31.
Refer to Wiring Diagram.
4.
Also check harness for short to power.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F105, M135
●
Joint connector-15
●
Harness for open and short between ECM and combination meter.
>> Replace open circuit or short to ground or short to power in harness or connectors.
4.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
119
R/L
Fuel level sensor
[Ignition switch: ON]
Approximately 0 - 4.8V
Output voltage varies with fuel
level.
107
B
Fuel level sensor ground
[Engine is running]
●
Idle speed
Approximately 0V
PBIB1118E
Continuity should exist.
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