Infiniti G20 (P11). Manual — part 253
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Diagnostic Procedure
=NCEC0557
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 a 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, ECM terminal 90 and fuel
level sensor unit terminal 1. 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
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0460 FUEL LEVEL SENSOR FUNCTION (SLOSH)
Diagnostic Procedure
EC-423
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5
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors B103, M75
I
Harness connectors F23, M49
I
Harness connectors M8, B3
I
Harness connectors B10, B120
I
Harness connectors M62, F24
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-97, “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-146.
©
INSPECTION END
DTC P0460 FUEL LEVEL SENSOR FUNCTION (SLOSH)
Diagnostic Procedure (Cont’d)
EC-424
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AEC801
Component Description
=NCEC0558
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
NCEC0559
Driving long distances naturally affect fuel gauge level.
This diagnosis detects the fuel gauge malfunction of the gauge not
moving even after a long distance has been driven.
Malfunction is detected when the output signal of the fuel level
sensor does not change within the specified range even though the
vehicle has been driven a long distance.
Possible Cause
NCEC0560
I
Harness or connectors
(The level sensor circuit is open or shorted.)
I
Fuel level sensor
Overall Function Check
NCEC0561
Use this procedure to check the overall function of the fuel level
sensor function. During this check, a 1st trip DTC might not be
confirmed.
WARNING:
When performing following procedure, be sure to observe the
handling of the fuel. Refer to FE-5, “FUEL SYSTEM”.
TESTING CONDITION:
Before starting overall function check, preparation of draining
fuel and refilling fuel is required.
SEF195Y
WITH CONSULT-II
NCEC0561S01
NOTE:
Start from step 11, if it is possible to confirm that the fuel
cannot be drained by 30
(7-7/8 US gal, 6-5/8 Imp gal) in
advance.
1)
Prepare a fuel container and a spare hose.
2)
Release fuel pressure from fuel line, refer to “Fuel Pressure
Release”, EC-50.
3)
Remove the fuel feed hose on the fuel level sensor unit.
4)
Connect a spare fuel hose where the fuel feed hose was
removed.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0461 FUEL LEVEL SENSOR FUNCTION
Component Description
EC-425
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5)
Turn ignition switch “OFF” and wait at least 10 seconds then
turn “ON”.
6)
Select “FUEL LEVEL SE” in “DATA MONITOR” mode with
CONSULT-II.
7)
Check “FUEL LEVEL SE” output voltage and note it.
8)
Select “FUEL PUMP” in “ACTIVE TEST” mode with CON-
SULT-II.
9)
Touch “ON” and drain fuel approximately 30
(7-7/8 US gal,
6-5/8 Imp gal) and stop it.
10) Fill fuel into the fuel tank for 30
(7-7/8 US gal, 6-5/8 Imp gal).
11) Check “FUEL LEVEL SE” output voltage and note it.
12) Check “FUEL LEVEL SE” output voltage and confirm whether
the voltage changes more than 0.03V during step 7 to 11.
If NG, check the fuel level sensor, refer to EL-97, “FUEL
LEVEL SENSOR UNIT CHECK”.
SEF615X
WITH GST
NCEC0561S02
NOTE:
Start from step 11, if it is possible to confirm that the fuel
cannot be drained by 30
(7-7/8 US gal, 6-5/8 Imp gal) in
advance.
1)
Prepare a fuel container and a spare hose.
2)
Release fuel pressure from fuel line, refer to “Fuel Pressure
Release”, EC-50.
3)
Remove the fuel feed hose on the fuel level sensor unit.
4)
Connect a spare fuel hose where the fuel feed hose was
removed.
5)
Turn ignition switch “OFF”.
6)
Set voltmeters probe between ECM terminal 83 (fuel level
sensor signal) and ground.
7)
Turn ignition switch “ON”.
8)
Check voltage between ECM terminal 83 and ground and note
it.
9)
Drain fuel by 30
(7-7/8 US gal, 6-5/8 Imp gal) from the fuel
tank using proper equipment.
10) Fill fuel into the fuel tank for 30
(7-7/8 US gal, 6-5/8 Imp gal).
11) Confirm that the voltage between ECM terminal 83 and ground
changes more than 0.03V during step 8 - 10.
If NG, check component of fuel level sensor, refer to EL-97,
“FUEL LEVEL SENSOR UNIT CHECK”.
DTC P0461 FUEL LEVEL SENSOR FUNCTION
Overall Function Check (Cont’d)
EC-426
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