2007 INFINITI M35 fuel

COMBINATION METERS
DI-19
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DI
Revision: 2007 April2007 M35/M45
Power Supply and Ground Circuit InspectionNKS003U6
Symptom : When any power supply circuit is malfunction, the following function is not operative.

BAT : Meter face illumination, Dot matrix LCD, Ring illumination, Turn signal/hazard indicator lights

ACC : Meter face illumination, Dot matrix LCD, Pointer illumination, Speedometer, Tachometer

IGN : Meter face illumination, Dot matrix LCD, Pointer illumination, Speedometer, Tachometer, Engine
coolant temperature, Fuel gauge
1. CHECK FUSE
Check for blown fuses.
OK or NG
OK >> GO TO 2.
NG >> Be sure to eliminate cause of malfunction before installing new fuse. Refer to PG-3, "
POWER
SUPPLY ROUTING CIRCUIT" .
2. CHECK POWER SUPPLY CIRCUIT
Check voltage between combination meter harness connector and
ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness between combination meter and fuse.
3. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector.
3. Check continuity between combination meter harness connector
and ground.
OK or NG
OK >> INSPECTION END
NG >> Repair harness or connector.
Power source Fuse No.
Battery 21
Ignition switch ACC or ON 6
Ignition switch ON or START 14
Terminals Ignition switch position
(+)
(–) OFF ACC ON
Combination meter
connectorTerminal
M5223
GroundBattery
voltageBattery
voltageBattery
voltage
20 VBattery
voltageBattery
voltage
12 0 V 0 VBattery
voltage
PKIB7637E
Combination meter
connectorTerminal
GroundContinuity
M529
Ye s 10
11
PKIB7638E

DI-22
COMBINATION METERS
Revision: 2007 April2007 M35/M45
Engine Coolant Temperature Signal InspectionNKS003U9
Symptom: Water temperature gauge indication is malfunction.
1. CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL
1. Start engine and select “METER A/C AMP” on CONSULT-II.
2. Using “W TEMP METER” on “DATA MONITOR”, compare the
value of “DATA MONITOR” to the indication of water tempera-
ture gauge of combination meter.
Is the indication of water temperature gauge same as the value in
the monitor?
OK >> GO TO 2.
NG >> Replace combination meter. [Perform self-diagnosis of ECM when the value in the monitor indi-
cates 215°C (419°F). Then repair or replace the malfunction part.]
2. CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL
1. Select “ENGINE” on CONSULT-II.
2. Using “COOLAN TEMP/S” on “DATA MONITOR”, print out the
CONSULT-II screen.
3. Select “METER A/C AMP” on CONSULT-II.
4. Using “W TEMP METER” on “DATA MONITOR”, compare the
value of “DATA MONITOR” to that of the “COOLAN TEMP/S”.
OK or NG
OK >> Perform self-diagnosis of ECM. Refer to EC-123, "CON-
SULT-II Function (ENGINE)" (for VQ35DE) or EC-826,
"CONSULT-II Function (ENGINE)" (for VK45DE).
NG >> Replace unified meter and A/C amp.
Fuel Level Sensor Signal InspectionNKS003UA
Symptom:

Fuel gauge indication is malfunction.

Low-fuel warning lamp indication is irregular.
NOTE:
The following symptoms are not malfunction.
Fuel level sensor unit

Depending on vehicle position or driving circumstance, the fuel level in the tank varies, and the pointer
may fluctuate.

If the vehicle is fueled with the ignition switch ON, the pointer will move slowly.
Low-fuel warning lamp

Depending on vehicle position or driving circumstance, the fuel in the tank flows and the warning lamp ON
timing may change.
Water temperature gauge pointer Reference value of data monitor °C (°F)
Hot Approx. 130 (266)
Middle Approx. 70 - 105 (158 - 221)
Cold Approx. 50 (122)
PKIA2091E
SKIA4368E

COMBINATION METERS
DI-23
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Revision: 2007 April2007 M35/M45
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 MONITOR”, compare the value
of “DATA MONITOR” to the indication of fuel gauge of combina-
tion meter.
OK or NG
OK >> GO TO 2.
NG >> Replace combination meter.
2. CHECK FUEL LEVEL SENSOR
1. Turn ignition switch OFF.
2. Check components. Refer to DI-26, "
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 (A) and fuel level sensor unit (sub) harness connector
(B).
3. Check continuity between unified meter and A/C amp. harness
connector (A) 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. 74
Three quarters Approx. 61
Half Approx. 42
A quarter Approx. 22
Empty Approx. 8
PKIA2088E
AB
Continuity
Connector Terminal Connector Terminal
M65 42 B52 1 Yes
A
GroundContinuity
Connector Terminal
M65 42 No
PKIB7642E

DI-24
COMBINATION METERS
Revision: 2007 April2007 M35/M45
4. CHECK FUEL LEVEL SENSOR (MAIN-SUB) CIRCUIT
1. Disconnect fuel level sensor unit and fuel pump (main) connec-
tor.
2. Check continuity between fuel level sensor unit (sub) harness
connector (A) and fuel level sensor unit and fuel pump (main)
harness connector (B).
3. Check continuity between fuel level sensor unit (sub) harness
connector (A) and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
5. CHECK FUEL LEVEL SENSOR (MAIN) CIRCUIT
Check continuity between fuel level sensor unit and fuel pump
(main) harness connector (A) and unified meter and A/C amp. har-
ness connector (B).
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.
NG >> Install the fuel level sensor unit properly.
AB
Continuity
Connector Terminal Connector Terminal
B52 2 B433 2 Yes
A
GroundContinuity
Connector Terminal
B52 2 No
PKIB7643E
AB
Continuity
Connector Terminal Connector Terminal
B4335 M6558Yes
PKIB7644E

COMBINATION METERS
DI-25
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Revision: 2007 April2007 M35/M45
Fuel Gauge Pointer Fluctuates, Indicator Wrong Value or VariesNKS003UB
1. CHECK FUEL GAUGE FLUCTUATION
Test drive vehicle to see if gauge fluctuates only during driving or at the instant of stopping.
Does the indication value vary only during driving or at the instant of 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.
Fuel Gauge Does Not Move to FULL PositionNKS003UC
1. QUESTION 1
Does it take a long time for the pointer to move to FULL position?
YES >> GO TO 2.
NO >> GO TO 3.
2. QUESTION 2
Was the vehicle fueled with the ignition switch ON?
YES >> Be sure to fuel the vehicle with the ignition switch OFF. Otherwise, it will take a long time to move
to FULL position because of the characteristic of the fuel gauge.
NO >> GO TO 3.
3. QUESTION 3
Is the vehicle parked on an incline?
YES >> Check the fuel level indication with vehicle on a level surface.
NO >> GO TO 4.
4. QUESTION 4
During driving, does the fuel gauge pointer move gradually toward EMPTY position?
YES >> Check the fuel level sensor unit. Refer to DI-26, "CHECK FUEL LEVEL SENSOR UNIT" .
NO >> The float arm may interfere or bind with any of the components in the fuel tank.

DI-26
COMBINATION METERS
Revision: 2007 April2007 M35/M45
Electrical Components InspectionNKS003UD
CHECK FUEL LEVEL SENSOR UNIT
For removal, refer to FL-4, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .
Check Fuel Level Sensor Unit and Fuel Pump (Main)
Check resistance between terminals 2 and 5.
*1 and *2: When float rod is in contact with stopper.

If the results of check are NG, check the fuel level sensor unit
and fuel pump (main) harness. Refer to DI-26, "
Check Fuel
Level Sensor Unit and Pump (Main) Harness" .
Check Fuel Level Sensor Unit and Pump (Main) Harness
Check continuity at following terminals.

If the results of check are NG, replace fuel pump assembly. If the
results of check are OK, replace fuel level sensor unit.
Check Fuel Level Sensor Unit (Sub)
Check resistance between terminals 1 and 2.
*1 and *2: When float rod is in contact with stopper.Terminal Float position [mm (in)] Resistance value [Ω]
25*1 Full 210 (8.27) Approx. 3
*2 Empty 30 (1.18) Approx. 80
SKIB3550J
Terminal Continuity
2 - Signal terminal (A)
Ye s
5 - Ground terminal (B)
SKIB3551J
Terminal Float position [mm (in)]Resistance
value [Ω]
12*1 Full 9 (0.35) Approx. 3
*2 Empty 179 (7.05) Approx. 43
SKIB2678J

DI-28
UNIFIED METER AND A/C AMP
Revision: 2007 April2007 M35/M45
UNIFIED METER AND A/C AMPPFP:27760
System DescriptionNKS003UG
For the unified meter and A/C amp., the signal required for controlling the combination meter are integrated in
the A/C auto amp.
COMBINATION METER CONTROL FUNCTION

Unified meter and A/C amp. inputs necessary information for combination meter from each unit with CAN
communication and so on.

Unified meter and A/C amp. outputs signals with communication line (TX, RX) between unified meter and
A/C amp. and combination meter.

Unified meter and A/C amp. corresponds a CONSULT-II function (self-diagnostic results, CAN diagnostic
support monitor and data monitor).
Input/output Signals
Between unified meter and A/C amp. and combination meter.
Unit Input from combination meter Output to combination meter
Unified meter and A/C amp.

Refuel status signal

Low-fuel warning lamp condition signal

Delivery destination data signal

Combination meter receive error signal

Combination meter specifications signal

Odo date signal

Vehicle speed signal

Turn indicator signal

High beam request signal

Ring illumination request signal

Position light request signal

Front fog lamp request signal

SET indicator lamp signal

CRUISE indicator lamp signal

Engine speed signal

Fuel level sensor signal (resistance value)

Engine coolant temperature signal

CAN communication condition signal of A/T

A/T position indicator signal

Manual mode indicator signal

A/T CHECK warning lamp signal

AWD warning lamp signal

Low tire pressure warning lamp signal

VDC OFF indicator lamp signal

SLIP indicator lamp signal

ABS warning lamp signal

Brake warning lamp signal

Malfunction indicator lamp signal

Oil pressure switch signal

Door switch signal

Buzzer request signal

ICC warning lamp signal

Meter display signal

AFS OFF indicator signal

DI-32
UNIFIED METER AND A/C AMP
Revision: 2007 April2007 M35/M45
DATA MONITOR
Operation Procedure
1. Touch “METER A/C AMP” on “SELECT SYSTEM” screen.
2. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
3. Touch either “MAIN SIGNALS” or “SELECTION FROM MENU” on the “DATA MONITOR” screen.
4. When “SELECTION FROM MENU” is selected, touch individual items to be monitored. When “MAIN SIG-
NALS” is selected, main items will be monitored.
5. Touch “START”.
6. Touch “RECORD” while monitoring, then the status of the moni-
tored item can be recorded. To stop recording, touch “STOP”.
Display Item List
X: Applicable MAIN SIGNALS Monitors main signals.
SELECTION FROM MENU Selects and monitors individual signal.
SKIA4957E
Display item [Unit]MAIN
SIGNALSSELECTION
FROM MENUDescription
SPEED METER [km/h] or [mph] X XDisplays the value of vehicle speed signal, which is input from ABS
actuator and electric unit (control unit).
SPEED OUTPUT [km/h] or [mph] X XDisplays the value of vehicle speed signal, which is transmitted to
each unit with CAN communication.
TACHO METER [rpm] X X Displays the value of engine speed signal, which is input from ECM.
W TEMP METER [°C] or [°F] X XDisplays the value of engine coolant temperature signal, which is
input from ECM.
FUEL METER [lit.] X XDisplays the value, which processes a resistance signal from fuel
gauge.
DISTANCE [km] or [mile] X XDisplays the value, which is calculated by vehicle speed signal from
ABS actuator and electric unit (control unit), fuel gauge and fuel
consumption from ECM.
FUEL W/L [ON/OFF] X X Displays [ON/OFF] condition of low-fuel warning lamp.
MIL [ON/OFF] X Displays [ON/OFF] condition of malfunction indicator lamp.
AIR PRES W/L [ON/OFF] X Displays [ON/OFF] condition of low tire pressure warning lamp.
SEAT BELT W/L [ON/OFF] X Displays [ON/OFF] condition of seat belt warning lamp.
BUZZER [ON/OFF] X X Displays [ON/OFF] condition of buzzer.
DOOR W/L [ON/OFF] X Displays [ON/OFF] condition of door warning lamp.
HI-BEAM IND [ON/OFF] X Displays [ON/OFF] condition of high beam indicator.
TURN IND [ON/OFF] X Displays [ON/OFF] condition of turn indicator.
FR FOG IND [ON/OFF] X Displays [ON/OFF] condition of front fog indicator.
OIL W/L [ON/OFF] X Displays [ON/OFF] condition of oil pressure warning lamp.
VDC/TCS IND [ON/OFF] X Displays [ON/OFF] condition of VDC/TCS OFF indicator lamp.
ABS W/L [ON/OFF] X Displays [ON/OFF] condition of ABS warning lamp.
SLIP IND [ON/OFF] X Displays [ON/OFF] condition of SLIP indicator lamp.
BRAKE W/L [ON/OFF] X Displays [ON/OFF] condition of brake warning lamp. *