Infiniti I35 (A33). Manual — part 271
SEC088D
Component Description
NHEC0999
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
variable resistor. Fuel level sensor output voltage changes depend-
ing on the movement of the fuel mechanical float.
On Board Diagnostic Logic
NHEC1000
ECM receives two signals from the fuel level sensor circuit.
One is fuel level sensor power supply circuit, and the other is fuel
level sensor ground circuit.
This diagnosis indicates the former, to detect open or short circuit
malfunction.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P0462
0462
Fuel level sensor cir-
cuit low input
An excessively low voltage is sent from the sensor
is sent to ECM.
I
Harness or connectors
(The sensor circuit is open or
shorted.)
I
Fuel level sensor
P0463
0463
Fuel level sensor cir-
cuit high input
An excessively high voltage is sent from the sen-
sor is sent to ECM.
DTC Confirmation Procedure
NHEC1001
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 ignition switch ON.
SEF195Y
WITH CONSULT-II
NHEC1001S01
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 “Diagnostic Procedure”,
EC-427.
WITH GST
NHEC1001S02
Follow the procedure “WITH CONSULT-II” above.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0462, P0463 FUEL LEVEL SENSOR
Component Description
EC-425
Wiring Diagram
NHEC1002
MEC638E
SEF711YB
DTC P0462, P0463 FUEL LEVEL SENSOR
Wiring Diagram
EC-426
Diagnostic Procedure
=NHEC1003
1
CHECK FUEL LEVEL SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect “fuel level sensor unit and fuel pump” harness connector.
3. Turn ignition switch ON.
4. Check voltage between “fuel level sensor unit and fuel pump” terminal 2 and ground with CONSULT-II or tester.
SEC220D
Voltage: Battery voltage
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M6, B3
I
Harness for open or short between combination meter and “fuel level sensor unit and fuel pump”
©
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 and fuel pump” terminal 5 and ground. Refer to Wiring Dia-
gram.
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 69 and “fuel level sensor and fuel pump” terminal 2. Refer to Wiring
Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0462, P0463 FUEL LEVEL SENSOR
Diagnostic Procedure
EC-427
5
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors F66, M229
I
Harness connectors M6, B3
I
Harness for open between ECM and fuel level sensor
©
Repair open circuit or short to power in harness on connectors.
6
CHECK FUEL LEVEL SENSOR
Refer to EL-140, “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-152.
©
INSPECTION END
DTC P0462, P0463 FUEL LEVEL SENSOR
Diagnostic Procedure (Cont’d)
EC-428
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