Infiniti G20 (P11). Manual — part 254
AEC801
Component Description
NCEC0562
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.
ECM Terminals and Reference Value
NCEC0654
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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
83
G/R
Fuel level sensor
[Ignition switch “ON”]
Approximately 0 - 4.8V
Output voltage varies with fuel
level.
90
B
Fuel level sensor
ground
[Engine is running]
I
Idle speed
Approximately 0V
On Board Diagnostic Logic
NCEC0563
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.
Malfunction is detected when an excessively low or high voltage is
sent from the sensor is sent to ECM.
Possible Cause
NCEC0564
I
Fuel level sensor circuit
(The fuel level sensor circuit is open or shorted.)
I
Fuel level sensor
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0464 FUEL LEVEL SENSOR CIRCUIT
Component Description
EC-427
DTC Confirmation Procedure
NCEC0565
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
NCEC0565S01
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-430.
WITH GST
NCEC0565S02
Follow the procedure “WITH CONSULT-II” above.
DTC P0464 FUEL LEVEL SENSOR CIRCUIT
DTC Confirmation Procedure
EC-428
Wiring Diagram
NCEC0566
TEC830
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0464 FUEL LEVEL SENSOR CIRCUIT
Wiring Diagram
EC-429
Diagnostic Procedure
=NCEC0567
1
CHECK FUEL LEVEL SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect fuel level sensor until and fuel pump harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between fuel level sensor unit terminal 4 and ground with CONSULT-II or tester.
SEF939XA
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M8, B3
I
Harness connectors B10, B120
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 1 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 unit terminal 4. 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.
DTC P0464 FUEL LEVEL SENSOR CIRCUIT
Diagnostic Procedure
EC-430
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