Infiniti Q45 (FY33). Manual — part 288

With the ignition switch in the ON or START position, power is supplied

I

through 7.5A fuse [No.

4

, located in the fuse block (J/B)]

I

to combination meter terminal

q

41

.

Ground is supplied

I

to combination meter terminal

q

39

I

through body grounds

M14

and

M47

.

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

I

to combination meter terminal

q

8

for the fuel gauge

I

from terminal

q

5

of the fuel level sensor unit

I

through terminal

q

4

of the fuel level sensor unit and

I

through ECM terminal

129

.

WATER TEMPERATURE GAUGE

The water temperature gauge indicates the engine coolant temperature. The reading on the gauge is based
on the resistance of the thermal transmitter.
As the temperature of the coolant increases, the resistance of the thermal transmitter decreases. A variable
ground is supplied to terminal

q

7

of the combination meter for the water temperature gauge. The needle on

the gauge moves from “C” to “H”.

TACHOMETER

The tachometer indicates engine speed in revolutions per minute (rpm).
The tachometer is regulated by a signal

I

from terminal

q

52

of the ECM

I

to combination meter terminal

q

13

for the tachometer.

SPEEDOMETER

The vehicle speed sensor sends a voltage signal to the combination meter for the speedometer.
The voltage signal is sent

I

to combination meter terminals

q

12

and

q

14

for the speedometer

I

from terminals

q

1

and

q

2

of the vehicle speed sensor.

The speedometer converts the voltage into the vehicle speed displayed.

GI

MA

EM

LC

EC

FE

AT

PD

FA

RA

BR

ST

RS

BT

HA

IDX

METER AND GAUGES

System Description (Cont’d)

EL-143

Combination Meter

CEL996

METER AND GAUGES

EL-144

Wiring Diagram — METER —

TEL745B

GI

MA

EM

LC

EC

FE

AT

PD

FA

RA

BR

ST

RS

BT

HA

IDX

METER AND GAUGES

EL-145

TEL084M

METER AND GAUGES

Wiring Diagram — METER — (Cont’d)

EL-146