Infiniti FX35, FX50 (S51). Manual — part 1385
MWI
POWER SUPPLY AND GROUND CIRCUIT
MWI-59
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
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L
M
B
A
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P
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Be sure to eliminate cause of malfunction before installing new fuse.
2.
CHECK POWER SUPPLY CIRCUIT
Check voltage between unified meter and A/C amp. harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Check harness between unified meter and A/C amp. and fuse.
3.
CHECK GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect unified meter and A/C amp. connector.
3.
Check continuity between unified meter and A/C amp. harness connector and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Repair harness or connector.
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) : Di-
agnosis Procedure
INFOID:0000000005619020
1.
CHECK FUSES AND FUSIBLE LINK
Check that the following IPDM E/R fuses or fusible links are not blown.
Is the fuse fusing?
YES
>> Replace the blown fuse or fusible link after repairing the affected circuit if a fuse or fusible link is
blown.
NO
>> GO TO 2.
2.
CHECK POWER SUPPLY CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect IPDM E/R connector.
3.
Check voltage between IPDM E/R harness connector and ground.
Terminals
Ignition switch position
Value (Approx.)
(+)
(-)
Unified meter A/C amp.
Terminal
Signal name
M67
54
Battery power supply
Ground
OFF
Battery voltage
41
ACC power supply
ACC
Battery voltage
53
Ignition signal
ON
Battery voltage
Unified meter A/C amp.
Ground
Continuity
Connector
Terminal
M67
55
Existed
71
Existed
Signal name
Fuses and fusible link No.
Battery power supply
D
50
51
MWI-60
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
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.
Terminals
Voltage
(Approx.)
(+)
(
−
)
IPDM E/R
Connector
Terminal
Ground
E4
1
Battery voltage
IPDM E/R
Ground
Continuity
Connector
Terminal
E5
12
Existed
E6
41
MWI
FUEL LEVEL SENSOR SIGNAL CIRCUIT
MWI-61
< DTC/CIRCUIT DIAGNOSIS >
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FUEL LEVEL SENSOR SIGNAL CIRCUIT
Description
INFOID:0000000005524624
The fuel level sensor unit and fuel pump (main) and the fuel level sensor unit (sub) detect the fuel level in the
fuel tank and transmit the fuel gauge signal to the unified meter and A/C amp.
Component Function Check
INFOID:0000000005524625
1.
CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL
Select the “Data Monitor” for the “METER/M&A” and compare the “FUEL METER” monitor value with the fuel
gauge reading on the combination meter.
Does monitor value match fuel gauge reading?
YES
>> INSPECTION END
NO
>> Replace combination meter.
Diagnosis Procedure
INFOID:0000000005524626
1.
CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL
1.
Turn ignition switch ON.
2.
Check voltage between unified meter and A/C amp. harness connector and ground.
Does it match fuel gauge reading?
YES
>> GO TO 2.
NO
>> Replace the unified meter and A/C amp.
2.
CHECK FUEL LEVEL SENSOR (SUB) CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect unified meter and A/C amp. connector and fuel level sensor unit (sub) connector.
3.
Check continuity between unified meter and A/C amp. harness connector and fuel level sensor unit (sub)
harness connector.
Fuel gauge pointer
Reference value of data monitor [L]
Full
Approx. 85.3
Three quarters
Approx. 67.3
Half
Approx. 45.4
A quarter
Approx. 22.0
Empty
Approx. 8.7
Terminals
Voltage
(Approx.)
(+)
(-)
Unified meter and A/C amp.
Ground
Connector
Terminal
M67
42
SKIB8867E
Unified meter A/C amp.
Fuel level sensor unit (sub)
Continuity
Connector
Terminal
Connector
terminal
M67
42
B21
1
Existed
MWI-62
< DTC/CIRCUIT DIAGNOSIS >
FUEL LEVEL SENSOR SIGNAL CIRCUIT
4.
Check continuity between unified meter and A/C amp. harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK FUEL LEVEL SENSOR (MAIN-SUB) CIRCUIT
1.
Disconnect fuel level sensor unit and fuel pump (main) connector.
2.
Check continuity between fuel level sensor unit (sub) harness connector and fuel level sensor unit and
fuel pump (main) harness connector.
3.
Check continuity between fuel level sensor unit (sub) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK FUEL LEVEL SENSOR (MAIN) CIRCUIT
Check continuity between fuel level sensor unit and fuel pump (main) harness connector and unified meter
and A/C amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair harness or connector.
5.
CHECK INSTALLATION CONDITION
Check fuel level sensor unit 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 properly.
Component Inspection
INFOID:0000000005524627
1.
REMOVE FUEL LEVEL SENSOR UNIT
Remove the fuel level sensor unit. Refer to
FL-5, "Removal and Installation"
.
>> GO TO 2.
2.
CHECK FUEL LEVEL SENSOR UNIT AND FUEL PUMP (MAIN)
Unified meter A/C amp.
Ground
Continuity
Connector
Terminal
M67
42
Not existed
Fuel level sensor unit (sub)
Fuel level sensor unit and fuel pump (main)
Continuity
Connector
Terminal
Connector
terminal
B21
2
B22
2
Existed
Fuel level sensor unit (sub)
Ground
Continuity
Connector
Terminal
B21
2
Not existed
Fuel level sensor unit and fuel pump (main)
Unified meter A/C amp.
Continuity
Connector
Terminal
Connector
terminal
B22
5
M67
58
Existed
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