2004 INFINITI FX35 fuel

DI-6
COMBINATION METERS
Revision: 2004 November 2004 FX35/FX45
WATER TEMPERATURE GAUGE
The water temperature gauge indicates the engine coolant temperature.
ECM provides a water temperature signal to unified meter and A/C amp. with CAN communication line. Uni-
fied meter and A/C amp. provides a water temperature signal to combination meter for water temperature
gauge with communication line between unified meter and A/C amp. and combination meter.
TACHOMETER
The tachometer indicates engine speed in revolutions per minute (rpm).
ECM provides an engine speed signal to unified meter and A/C amp. with CAN communication line. Unified
meter and A/C amp. provides an engine speed signal to combination meter for tachometer with communica-
tion line between unified meter and A/C amp. and combination meter.
FUEL GAUGE
The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by a variable ground signal supplied

from unified meter and A/C amp. terminal 36

through the fuel level sensor unit and fuel pump (main) terminals 5 and 2, and

through the fuel level sensor unit (sub) terminals 2 and 1

to unified meter and A/C amp. terminal 28 for the fuel gauge.
Unified meter and A/C amp. provides an fuel level signal to combination meter for fuel gauge with communica-
tion line between unified meter and A/C amp. and combination meter.
SPEEDOMETER
ABS actuator and electric unit (control unit) provides a vehicle speed signal to the unified meter and A/C amp.
with CAN communication line. After unified meter and A/C amp. received the vehicle speed signal, it changes
the signal to 8 pulse signal and provides the 8 pulse signal to the combination meter for the speedometer.
Component Parts and Harness Connector LocationAKS005MI
SKIA4796E

DI-12
COMBINATION METERS
Revision: 2004 November 2004 FX35/FX45
Terminals and Reference Value for Unified Meter and A/C Amp.AKS005MN
Meter/Gauge Operation and Odo/Trip MeterAKS005MO
SELF-DIAGNOSIS FUNCTION

Odo/trip meter segment, A/T indicator segment and ICC system display segment operation can be
checked in self-diagnosis mode.

Meters/gauges can be checked in self-diagnosis mode.
HOW TO ALTERNATE DIAGNOSIS MODE
1. Turn ignition switch ON, and switch the odo/trip meter to “trip A” or “trip B”.
NOTE:
If the diagnosis function is activated with the trip meter A displayed, the mileage on the trip meter A will
indicate 0000.0, but the actual trip mileage will be retained. (Trip B operates the same way.)
2. Turn ignition switch OFF.
36 — Trip transfer switch OFFTrip transfer switch is pushed Approx. 0V
Trip transfer switch is released Approx. 5V Terminal
No.Wire
colorItemCondition
Reference value
Ignition
switchOperation or condition
Terminal
No.Wire
colorItemCondition
Reference value
Ignition
switchOperation or condition
1 L CAN H — — —
9PUTX communication line (To
combination meter)ON —
11 R C A N L — — —
19 L/BRX communication line (From
combination meter)ON —
21 R/W Battery power supply OFF — Battery voltage
22 G/R Ignition switch ON or START ON — Battery voltage
26 R/GVehicle speed signal
(8-pulse)ONSpeedometer operated
[When vehicle speed is
approx. 40 km/h (25 MPH)]
28 W/B Fuel level sensor signal — —Refer to DI-25, "
CHECK FUEL
LEVEL SENSOR UNIT" .
29 B Ground (for power) ON — Approx. 0V
30 B Ground ON — Approx. 0V
36 B/W Fuel level sensor ground ON — Approx. 0V
46 L/W Ignition switch ACC or ON ACC — Battery voltage
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COMBINATION METERS
DI-13
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Revision: 2004 November 2004 FX35/FX45
3. Turn ignition switch ON while pressing trip transfer switch and
trip reset switch at the same time.
4. After ignition switch is turned ON, release trip transfer switch
and trip reset switch. (With 7 seconds after the ignition switch is
turned ON.)
5. All the segments on the odo/trip meter, A/T indicator and ICC
system display illuminates, and simultaneously the low-fuel
warning lamp indicator illuminates. At this time, the unified meter
control unit is turned to diagnosis mode.
NOTE:
If any of the segments is not displayed, replace combination
meter.
6. Push the odo/trip meter switch. Each meter/gauge should indi-
cate as shown in the figure while pushing odo/trip meter switch.
(At this time, the low-fuel warning lamp goes off.)
CONSULT-II FunctionAKS005MP
Refer to DI-31, "CONSULT-II Function" in “UNIFIED METER AND A/C AMP”.
How to Proceed With Trouble DiagnosisAKS005MQ
1. Confirm the symptom or customer complaint.
2. Perform diagnosis according to diagnosis flow. Refer to DI-13, "
Diagnosis Flow" .
3. According to the symptom chart, repair or replace the cause of the symptom.
4. Does the meter operate normally? If so, go to 5. If not, go to 2.
5. INSPECTION END
Diagnosis FlowAKS005MR
1. CHECK SELF-DIAGNOSTIC RESULTS OF UNIFIED METER AND A/C AMP.
1. Start engine.
2. Select “METER A/C AMP” on CONSULT-II, and perform self-diagnosis of unified meter and A/C amp.
Refer to DI-31, "
CONSULT-II Function" .
3. After erasing the self-diagnostic results, perform self-diagnosis again.
Self-diagnostic results content
No malfunction detected>>GO TO 2.
Malfunction detected>> Go to DI-16, "
Symptom Chart 2" .
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SKIA6170E
SKIA4831E

DI-14
COMBINATION METERS
Revision: 2004 November 2004 FX35/FX45
2. CHECK WARNING LAMP ILLUMINATION
Turn ignition switch ON. (Engine stopped)
Do warning lamps (such as malfunction indicator lamp and oil pressure warning lamp) illuminate?
YES >> GO TO 3.
NO >> Check ignition power supply system of combination meter. Refer to DI-15, "
Power Supply and
Ground Circuit Inspection" .
3. CHECK SELF-DIAGNOSIS OPERATION OF COMBINATION METER
Perform combination meter self-diagnosis. Refer to DI-12, "
SELF-DIAGNOSIS FUNCTION" .
Does self-diagnosis function operate?
YES >> GO TO 4.
NO >> Check battery power supply of combination meter and ground system. Refer to DI-15, "
Power
Supply and Ground Circuit Inspection" .
4. CHECK ODO/TRIP METER OPERATION
Check odo/trip meter segment, A/T indicator or ICC system display segment.
Do all segments illuminate?
YES >> GO TO 5.
NO >> Replace combination meter.
5. CHECK LOW-FUEL WARNING LAMP ILLUMINATION CONFIRMATION
During low-fuel warning lamp check, confirm illumination of low-fuel warning lamp.
OK or NG
OK >> GO TO 6.
NG >> Replace combination meter.
6. CHECK COMBINATION METER CIRCUIT
Check indication of each meter/gauge in self-diagnosis mode.
OK or NG
OK >> Go to DI-16, "Symptom Chart 1" .
NG >> Replace combination meter.
SKIA6170E
Condition of odo/trip meter switch Low-fuel warning lamp
Pushed Does not illuminate.
Released Illuminates.
SKIA4831E

DI-16
COMBINATION METERS
Revision: 2004 November 2004 FX35/FX45
3. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between combination meter harness connector
terminals and ground.
3. Check continuity between unified meter and A/C amp. harness
connector terminals and ground.
OK or NG
OK >> INSPECTION END
NG >> Repair harness or connector.
Symptom Chart 1 AKS005MT
Symptom Chart 2AKS005MU
Terminals
Continuity (+)
(–)
ConnectorTerminal
(Wire color)
M205 (B)
Ground Yes 6 (B)
15 (B)
SKIA4833E
Terminals
Continuity (+)
(–)
ConnectorTerminal
(Wire color)
M5629 (B)
Ground Yes
30 (B)
SKIA5202E
Trouble phenomenon Possible cause
Indication is irregular for the speedometer and odo/trip meter. Refer to DI-17, "
Vehicle Speed Signal Inspection" .
Tachometer indication is malfunction. Refer to DI-18, "
Engine Speed Signal Inspection" .
Water temperature gauge indication is malfunction. Refer to DI-19, "
Water Temperature Signal Inspection" .
Fuel gauge indication is malfunction. Refer to DI-20, "
Fuel Level Sensor Signal Inspection 1" .
Low-fuel warning lamp indication is irregular. Refer to DI-21, "
Fuel Level Sensor Signal Inspection 2" .
Indications are irregular for more than one gauge. Replace combination meter.
A/T position indicator is malfunction. Refer to DI-53, "
A/T Indicator Is Malfunction" .
Illumination control does not operate.Refer to DI-24, "
Odo/Trip Meter and Illumination Control Switch
Inspection" .
Displayed item [Code] Inspection contents Possible cause
CAN COMM CIRC [U1000] Inspect the CAN communication.Refer to DI-22, "
CAN Communication System Inspection" .
CAUTION:
Even when there is no malfunction on CAN communica-
tion system, malfunction may be misinterpreted when bat-
tery has low voltage (when maintaining 7-8V for about 2
seconds) or 10A fuse [No. 19, located in the fuse block (J/
B)] is disconnected.

DI-20
COMBINATION METERS
Revision: 2004 November 2004 FX35/FX45
Fuel Level Sensor Signal Inspection 1AKS005MY
The following symptoms do not indicate a malfunction.
FUEL GAUGE

Depending on vehicle position or driving circumstance, the fuel in the tank flows and the pointer may fluc-
tuate.

If the vehicle is fueled with the ignition switch ON, the pointer will move slowly.
1. CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL
1. Select “METER A/C AMP” on CONSULT-II.
2. Using “FUEL METER” on “DATA MONIOR”, compare the value
of “DATA MONITOR” with fuel gauge pointer of combination
meter.
OK or NG
OK >> GO TO 2.
NG >> Replace combination meter.
2. CHECK FUEL LEVEL SENSOR
Check components. Refer to DI-25, "
CHECK FUEL LEVEL SENSOR UNIT" .
OK or NG
OK >> GO TO 3.
NG >> Replace fuel level sensor unit.
3. CHECK FUEL LEVEL SENSOR (SUB) CIRCUIT
1. Disconnect unified meter and A/C amp. connector and fuel level sensor unit (sub) connector.
2. Check continuity between unified meter and A/C amp. harness
connector M56 terminal 28 (W/B) and fuel level sensor unit (sub)
harness connector B40 terminal 1 (LG).
3. Check continuity between unified meter and A/C amp. harness
connector M56 terminal 28 (W/B) and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
Fuel gauge pointer Reference value of data monitor [lit.]
Full Approx. 86
Three quarters Applox. 70
Half Approx. 48
A quarter Approx. 25
Empty Approx. 9
PKIA2088E
Continuity should exist.
Continuity should not exist.
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COMBINATION METERS
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Revision: 2004 November 2004 FX35/FX45
4. 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 B40 terminal 2 (Y) and fuel level sensor unit and fuel
pump (main) harness connector B39 terminal 2 (Y).
3. Check continuity between fuel level sensor unit (sub) harness
connector B40 terminal 2 (Y) and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
5. CHECK FUEL LEVEL SENSOR (MAIN) CIRCUIT
1. Check continuity between fuel level sensor unit and fuel pump
(main) harness connector B39 terminal 5 (B) and unified meter
and A/C amp. harness connector M56 terminal 36 (B/W).
2. Check continuity between fuel level sensor unit and fuel pump
(main) harness connector B39 terminal 5 (B) and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
6. 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.
OK or NG
OK >> Replace unified meter and A/C amp. Refer to DI-34, "Removal and Installation of Unified Meter
and A/C Amp." .
NG >> Install the fuel level sensor unit properly.
Fuel Level Sensor Signal Inspection 2AKS005MZ
The following symptoms do not indicate a malfunction.
LOW-FUEL WARNING LAMP
Depending on vehicle position or driving circumstance, the fuel in the tank flows and the warning lamp ON tim-
ing may change.
1. CHECK FUEL GAUGE
Check if fuel gauge is normally operating.
YES >> Replace combination meter.
NO >> Go to DI-20, "
Fuel Level Sensor Signal Inspection 1" . Continuity should exist.
Continuity should not exist.
SKIA5204E
Continuity should exist.
Continuity should not exist.
SKIA5205E

DI-24
COMBINATION METERS
Revision: 2004 November 2004 FX35/FX45
8. CHECK VOLTAGE SIGNAL OF UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF and connect unified meter and A/C amp. connector.
2. Turn ignition switch ON.
3. Check voltage signal between combination meter harness con-
nector M20 terminal 14 (PU) and ground with simple oscillo-
scope of CONSULT-II.
OK or NG
OK >> Replace combination meter.
NG >> Replace unified meter and A/C amp. Refer to DI-34, "
Removal and Installation of Unified Meter
and A/C Amp." .
Odo/Trip Meter and Illumination Control Switch InspectionAKS005N2
1. CHECK ODO/TRIP METER AND ILLUMINATION CONTROL SWITCH
1. Remove odo/trip meter and illumination control switch. Refer to DI-27, "
Removal and Installation of Odo/
Trip Meter and Illumination Control Switch" .
2. Check continuity between odo/trip meter and illumination control
switch harness connector terminals 25, 26, 35 or 36 and 27.
OK or NG
OK >> Replace combination meter.
NG >> Replace odo/trip meter and illumination control switch.
Fuel Gauge Pointer Fluctuates, Indicator Wrong Value or VariesAKS005N3
1. CHECK FUEL GAUGE FLUCTUATION
Test drive vehicle to see if gauge fluctuates only during driving or before or after stopping.
Does the indication value vary only during driving or before or after stopping?
YES >> The pointer fluctuation may be caused by fuel level change in the fuel tank. Condition is normal.
NO >> Ask the customer about the situation when the symptom occurs in detail, and perform the trouble
diagnosis. 14 (PU) - Ground:
SKIA9260ESKIA3362E
Terminal Condition Continuity
26
27Illumination control switch (+) is pushed. Yes
Illumination control switch (+) is released. No
25Illumination control switch (–) is pushed. Yes
Illumination control switch (–) is released. No
36Trip transfer switch is pushed. Yes
Trip transfer switch is released. No
35Trip reset switch is pushed. Yes
Trip reset switch is released. No
SKIA4846E