Nissan Maxima. Manual — part 856
MWI
POWER SUPPLY AND GROUND CIRCUIT
MWI-39
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
J
K
L
M
B
A
O
P
1.
CHECK FUSES AND FUSIBLE LINK
Check that the following IPDM E/R fuses or fusible link are not blown.
Is the fuse blown?
YES
>> Replace the blown fuse or fusible link after repairing the affected circuit.
NO
>> GO TO 2
2.
CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connectors.
3. Check voltage between IPDM E/R harness connector and ground.
Is the measurement value normal?
YES
>> GO TO 3
NO
>> Repair harness or connector.
3.
CHECK GROUND CIRCUIT
Check continuity between IPDM E/R harness connectors and
ground.
Does continuity exist?
YES
>> Inspection End.
NO
>> Repair harness or connector.
Terminal No.
Signal name
Fuses and fusible link No.
1
Battery power supply
B
2
A, D
36
A, E, L
Terminals
Voltage (V)
(Approx.)
(+)
(
−)
IPDM E/R
Connector
Terminal
Ground
E16
1
Battery voltage
2
E18
36
IPDM E/R
Ground
Continuity
Connector
Terminal
A: E18
12
Yes
B: E17
41
ALCIA0034ZZ
MWI-40
< DTC/CIRCUIT DIAGNOSIS >
FUEL LEVEL SENSOR SIGNAL CIRCUIT
FUEL LEVEL SENSOR SIGNAL CIRCUIT
Description
INFOID:0000000010049583
The fuel level sensor unit and fuel pump (fuel level sensor) detects the approximate fuel level in the fuel tank
and transmits the fuel level signal to the combination meter.
Component Function Check
INFOID:0000000010049584
1.
COMBINATION METER INPUT SIGNAL
1. Select “METER/M&A” on CONSULT.
2. Using “FUEL METER” of “DATA MONITOR”, compare the value of DATA MONITOR with fuel gauge
pointer of combination meter.
Does the data monitor value approximately match the fuel gauge indication?
YES
>> Inspection End.
NO
>> Replace combination meter. Refer to
MWI-122, "Removal and Installation"
Diagnosis Procedure
INFOID:0000000010049585
Regarding Wiring Diagram information, refer to
.
1.
CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Check combination meter and fuel level sensor unit and fuel pump (fuel level sensor) terminals (meter-
side and harness-side) for poor connection.
Is the inspection result normal?
YES
>> GO TO 2
NO
>> Repair or replace terminals or connectors.
2.
CHECK FUEL LEVEL SENSOR UNIT AND FUEL PUMP (FUEL LEVEL SENSOR) CIRCUIT
1. Disconnect combination meter connector and fuel level sensor
unit and fuel pump (fuel level sensor) connector.
2. Check continuity between combination meter harness connector
(A) and fuel level sensor unit and fuel pump (fuel level sensor)
harness connector (B).
3. Check continuity between combination meter harness connector
(A) and ground.
Fuel gauge pointer
Reference value of data monitor [lit.]
Full
Approx. 68
3/4
Approx. 56
1/2
Approx. 38
1/4
Approx. 22
Empty
Approx. 4
A
B
Continuity
Connector
Terminal
Connector
Terminal
M24
34
B42
2
Yes
AWNIA1768ZZ
MWI
FUEL LEVEL SENSOR SIGNAL CIRCUIT
MWI-41
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
J
K
L
M
B
A
O
P
Is the inspection result normal?
YES
>> GO TO 3
NO
>> Repair harness or connector.
3.
CHECK FUEL LEVEL SENSOR UNIT AND FUEL PUMP (FUEL LEVEL SENSOR) GROUND CIRCUIT
1. Check continuity between combination meter harness connector
(A) and fuel level sensor unit and fuel pump (fuel level sensor)
harness connector (B).
2. Check continuity between combination meter harness connector
(A) and ground.
Is the inspection result normal?
YES
>> GO TO 4
NO
>> Repair harness or connector.
4.
CHECK INSTALLATION CONDITION
Check fuel level sensor unit and fuel pump (fuel level sensor) installation, and check whether the float arm
interferes or binds with any of the internal components in the fuel tank.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Install the fuel level sensor unit and fuel pump (fuel level sensor) properly.
Component Inspection
INFOID:0000000010049586
1.
REMOVE FUEL LEVEL SENSOR UNIT AND FUEL PUMP (FUEL LEVEL SENSOR)
Remove the fuel level sensor unit and fuel pump (fuel level sensor). Refer to
FL-6, "Removal and Installation"
.
>> GO TO 2
2.
CHECK FUEL LEVEL SENSOR UNIT AND FUEL PUMP (FUEL LEVEL SENSOR)
Check the resistance between terminals 2 and 5.
1* and 2*: When float arm is in contact with stopper.
Is inspection result normal?
YES
>> Inspection End.
NO
>> Replace fuel level sensor unit and fuel pump (fuel level
FL-6, "Removal and Installation"
.
A
Ground
Continuity
Connector
Terminal
M24
34
No
A
B
Continuity
Connector
Terminal
Connector
Terminal
M24
24
B42
5
Yes
A
Ground
Continuity
Connector
Terminal
M24
24
No
AWNIA1769ZZ
Terminal
Float position
mm (in)
Resistance value
(Approx.)
2
5
1*
Full (1)
154.5 (6.1)
4.5
Ω
2*
Empty (2)
23.4 (0.9)
81.5
Ω
WKIA5456E
MWI-42
< DTC/CIRCUIT DIAGNOSIS >
OIL PRESSURE SWITCH SIGNAL CIRCUIT
OIL PRESSURE SWITCH SIGNAL CIRCUIT
Description
INFOID:0000000010049587
Detects the engine oil pressure and transmits the oil pressure switch signal to the IPDM E/R.
Component Function Check
INFOID:0000000010049588
1.
COMBINATION METER INPUT SIGNAL
1. Select “METER/M&A” on CONSULT.
2. Monitor “OIL W/L” of “DATA MONITOR” while operating ignition switch.
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010049589
Regarding Wiring Diagram information, refer to
.
1.
CHECK OIL PRESSURE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector F10 and oil pressure switch connector F41.
3. Check continuity between IPDM E/R harness connector F10 terminal 75 and oil pressure switch harness
connector F41 terminal 1.
4. Check continuity between IPDM E/R harness connector F10 terminal 75 and ground.
Are the inspection results normal?
YES
>> Inspection End.
NO
>> Repair harness or connector.
Component Inspection
INFOID:0000000010049590
1.
CHECK OIL PRESSURE SWITCH
Check continuity between oil pressure switch and ground.
Is the inspection result normal?
OIL W/L
When ignition switch is in ON
position (Engine stopped)
: ON
When engine is running
: OFF
Continuity should exist.
Continuity should not ex-
ist.
Condition
Oil pressure [kPa (kg/cm
2
, psi)]
Continuity
Engine stopped
Less than 29 (0.3, 4)
Yes
Engine running
More than 29 (0.3, 4)
No
ELF0044D
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