2007 INFINITI M35 ABS

CO-56
[VK45DE]
THERMOSTAT AND WATER CONTROL VALVE
Revision: 2007 April2007 M35/M45
5. Disconnect water suction hose from water inlet.
6. Remove water inlet and thermostat.
CAUTION:
Do not disassemble thermostat.
7. Remove intake manifolds (upper and lower). Refer to EM-179, "
INTAKE MANIFOLD" .
8. Disconnect radiator hose (upper) from thermostat housing.
9. Disconnect heater hoses from water outlet and heater pipe.
10. Remove thermostat housing, water outlet pipe, water connector, water control valve, water outlet and
heater pipe.
CAUTION:
Do not disassemble water control valve.
INSPECTION AFTER REMOVAL

Make sure that valves both in thermostat and water control valve are completely closing at normal tempar-
ature.

Place a thread so that it is caught in the valves of the thermostat
and water control valve. Immerse fully in a container filled with
water. Heat while stirring. (The example in the figure shows ther-
mostat.)

The valve opening temperature is the temperature at which the
valve opens and falls from the thread.

Continue heating. Check the maximum valve lift.
NOTE:
The maximum valve lift standard temperature for water control
valve is the reference value.

After checking the maximum valve lift, lower the water tempera-
ture and check the valve closing temperature.
Standard values:

If the malfunctioning condition, when closing valve at normal temperature, or measured values are out of
the standard, replace thermostat and/or water control valve.
INSTALLATION
Note the following, and install in the reverse order of removal.
CAUTION:
Be careful not to spill engine coolant over engine room. Use rag to absorb engine coolant.
Thermostat and Water Control Valve

Install thermostat and water control valve with the whole circum-
ference of each flange part fit securely inside rubber ring. (The
example in the figure shows thermostat.)
SLC252B
Thermostat Water control valve
Valve opening temperature 80 - 84°C (176 - 183°F) 93.5 - 96.5°C (200 - 206°F)
Maximum valve liftMore than 10 mm/95°C
(0.39 in/203°F)More than 8 mm/108°C
(0.315 in/226°F)
Valve closing temperature 77°C (171°F) 90°C (194°F)
PBIC0157E

DI-6
COMBINATION METERS
Revision: 2007 April2007 M35/M45
SPEEDOMETER
The speedometer indicates the vehicle speed.

ABS actuator and electric unit (control unit) converses a pulse signal from wheel sensor to vehicle speed
signal, and transmit vehicle speed signal to unified meter and A/C amp. with CAN communication.

Unified meter and A/C amp. transmits vehicle speed signal to combination meter with communication line.

Combination meter converses vehicle speed signal to the angle signal, and commands to speedometer.
TACHOMETER
The tachometer indicates engine speed in revolutions per minute (rpm).

ECM converses a signal from crankshaft position sensor to engine speed signal, and transmits to unified
meter and A/C amp. with CAN communication.

Unified meter and A/C amp. transmits engine speed signal to combination meter with communication line.

Combination meter converses engine speed signal to the angle signal, and commands to tachometer.
WATER TEMPERATURE GAUGE
The water temperature gauge indicates the engine coolant temperature.

ECM converses a signal from engine coolant temperature sensor to engine coolant temperature signal,
and transmits to unified meter and A/C amp. with CAN communication.

Unified meter and A/C amp. transmits engine coolant temperature signal to combination meter with com-
munication line.

Combination meter converses engine coolant temperature signal to the angle signal, and commands to
water temperature gauge.
PKIC0696E
PKIB7631E
PKIB7632E

COMBINATION METERS
DI-7
C
D
E
F
G
H
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L
MA
B
DI
Revision: 2007 April2007 M35/M45
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 58

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 42.
Unified meter and A/C amp. provides a fuel level signal to combination meter for fuel gauge with communica-
tion line between unified meter and A/C amp. and combination meter.
ODO/TRIP METER

ABS actuator and electric unit (control unit) converses a pulse signal from wheel sensor to vehicle speed
signal, and transmits vehicle speed signal to unified meter and A/C amp. with CAN communication.

Unified meter and A/C amp. converses vehicle speed signal to 8 pulse signal, and transmits to combina-
tion meter.

Combination meter processes the 8 pulse signal and the memory signals from the meter memory circuit.
Then the mileage is displayed.
How to Change The Display For Odo/trip Meter
Operating the odo/trip meter switch allows switching the mode in the following order.

The odo/trip meter display switching and trip display resetting
can be identified by the time from pressing the odo/trip meter
switch (1) to releasing it.

When resetting with “trip A” displayed, only “trip A” display is
reset. (The same way for “trip B”.)
SEL175W
PKIB7633E

COMBINATION METERS
DI-9
C
D
E
F
G
H
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MA
B
DI
Revision: 2007 April2007 M35/M45
FA I L - S A F E
Combination meter performs fail-safe operation when unified meter and A/C amp. communication is malfunc-
tion.
Solution for communication error between the unified meter and A/C amp. and combination meter
Function Specifications
Speedometer
Reset to zero by suspending communication. Tachometer
Fuel gauge
Water temperature gauge
Illumination control Meter illumination When suspending communication, change to nighttime mode.
Dot matrix LCDPush engine starter
The display turns off by suspending communication. A/T position
ICC system
Buzzer The buzzer turns off by suspending communication.
Warning lamp/indicator lampABS warning lamp
The lamp turns on by suspending communication. Brake warning lamp
CRUISE warning lamp
VDC OFF indicator lamp
SLIP indicator lamp
A/T CHECK warning lamp
The lamp turns off by suspending communication. AWD warning lamp
Oil pressure warning lamp
Door warning lamp
Malfunction indicator lamp
CRUISE indicator lamp
SET indicator lamp
Low tire pressure warning lamp
AFS OFF indicator lamp
Front fog indicator lamp
High beam indicator
Turn signal indicator lamp
Key warning lamp

DI-20
COMBINATION METERS
Revision: 2007 April2007 M35/M45
Vehicle Speed Signal InspectionNKS003U7
Symptom: Odo/trip meter indication is malfunction.
1. CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL
1. Connect CONSULT-II, and start engine.
2. Compare the value in “SPEED METER” of “DATA MONITOR” in
“METER A/C AMP” to that in speedometer in the combination
meter during driving.
Is the value in speedometer almost same as that in the monitor?
YES >> Preform self-diagnosis of ABS actuator and electric unit
(control unit). Refer to BRC-23, "
CONSULT-II Functions
(ABS)" .
NO >> GO TO 2.
2. CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL
1. Start engine and drive vehicle at approximately 40 km/h (25
MPH).
2. Check voltage signal between unified meter and A/C amp. har-
ness connector and ground.
NOTE:
Maximum voltage may be 5 V due to specifications (connected units).
OK or NG
OK >> GO TO 3.
NG-1 >> If monitor indicates “0 V” constantly, perform the following.
1. Check each unit inputting vehicle speed signal (8 pulse). Malfunction is caused by short circuit
between each unit and unified meter and A/C amp.
2. Repair or replace malfunctioning parts.
NG-2 >> If monitor indicates “5 V” or “12 V” constantly, replace unified meter and A/C amp.
PKIB7639E
Terminals
Voltage (Approx.) (+)
(–)
Unified meter and
A/C amp.connectorTerminal
M64 28 Ground
PKIB7640E
PKIA1935E

COMBINATION METERS
DI-27
C
D
E
F
G
H
I
J
L
MA
B
DI
Revision: 2007 April2007 M35/M45
Removal and Installation of Combination MeterNKS003UE
REMOVAL
1. Remove cluster lid A. Refer to IP-10, "INSTRUMENT PANEL
ASSEMBLY" .
2. Remove the screws (A) using power tools, and pull out combina-
tion meter (1).
3. Disconnect connector, and remove combination meter (1).
INSTALLATION
Installation is the reverse order of removal.
Disassembly and Assembly of Combination MeterNKS003UF
DISASSEMBLY
Disengage tabs to separate front cover.
ASSEMBLY
Assembly is the reverse order of disassembly.
SKIB4957E
SKIB2952J
1. Front cover
2. Unified meter control unit

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. *