Infiniti QX4 (R50). Manual — part 235
SEF018S
Component Description
NBEC0616
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 side
is variable resistor. Fuel level sensor output voltage changes
depending on the movement of the fuel mechanical float.
On Board Diagnostic Logic
NBEC0617
When the vehicle is parked, naturally the fuel level in the fuel tank
is stable. It means that output signal of the fuel level sensor does
not change. If ECM senses sloshing signal from the sensor, fuel
level sensor malfunction is detected.
Malfunction is detected when even though the vehicle is parked, a
signal being varied is sent from the fuel level sensor to ECM.
Possible Cause
NBEC0618
I
Fuel level sensor circuit
(The fuel level sensor circuit is open or shorted.)
I
Fuel level sensor
SEF195Y
DTC Confirmation Procedure
NBEC0619
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
NBEC0619S01
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine and wait maximum of 2 consecutive minutes.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-409.
WITH GST
NBEC0619S02
Follow the procedure “WITH CONSULT-II” above.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0460 FUEL LEVEL SENSOR FUNCTION (SLOSH)
Component Description
EC-407
Wiring Diagram
NBEC0620
MEC983C
DTC P0460 FUEL LEVEL SENSOR FUNCTION (SLOSH)
Wiring Diagram
EC-408
Diagnostic Procedure
=NBEC0621
1
CHECK FUEL LEVEL SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect fuel level sensor unit harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between fuel level sensor unit terminal 3 and ground with CONSULT-II or a tester.
SEF993Y
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M2, B1
I
Harness for open or short between combination meter and fuel level sensor unit
©
Repair or replace harness or connectors.
3
CHECK FUEL LEVEL SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between fuel level sensor unit terminal 2 and body ground. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK
©
GO TO 4.
NG
©
Repair open circuit or short to power in harness or connectors.
4
CHECK FUEL LEVEL SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 83 and fuel level sensor terminal 3, ECM terminal 59 and fuel level
sensor unit terminal 2. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0460 FUEL LEVEL SENSOR FUNCTION (SLOSH)
Diagnostic Procedure
EC-409
5
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M2, B1
I
Harness connectors M94, F27
I
Harness for open or short between ECM and fuel level sensor
©
Repair open circuit or short to ground or short to power in harness or connectors.
6
CHECK FUEL LEVEL SENSOR
Refer to EL-108, “Fuel Level Sensor Unit Check”.
OK or NG
OK
©
GO TO 7.
NG
©
Replace fuel level sensor unit.
7
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
©
INSPECTION END
DTC P0460 FUEL LEVEL SENSOR FUNCTION (SLOSH)
Diagnostic Procedure (Cont’d)
EC-410
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