Isuzu Trooper (1998-2002 year). Manual - part 895

8D–114

WIRING SYSTEM

Circuit Diagram (LHD)-2

DROPPING

RESIST

OR

GLOW

PLUG

GLOW

RELA

Y

-2

QOS

 III 

CONTROL

 UNIT

GLOW

RELA

Y

-1

C-66

12

H-42

16

1

1

C-60

C-59

3.0

R/W

3.0

B/Y

3.0

B/R

0.5

B/G

0.5

B/G

0.85

B/Y

FL-5 50A

GLOW

C-53

1

C-59

2

1

C-54

BA

TT

.(+)

C-55

1

2

C-55

A

C-66

5

H-41

7

3.0

B/R

0.5

B/L

0.5

B/L

0.85

B/Y

0.85

B/Y

3.0

R/W

C-51

1

C-51

C-52

1

2

2

C-52

12

E-41

E-41

QOS THERMO 

SENSOR

(ENGINE)

QOS III CONTROL

 UNIT

C-16

0.5

B

0.5

Y

0.5

Y

0.5

B/Y

0.5

B

8

C-66

10

FENDER

-LH

C-66

8

C-66

4

H-4

8

H-4

12

D08RW981

WIRING SYSTEM

8D–115

Parts Location (LHD)

Legend

(1) C-66
(2) I-9
(3) H-7, H-8, H-24, H-25
(4) C-16
(5) Fuse Box
(6) Glow Plug 

× 

4

(7) H-4, H-5
(8) E-37
(9) E-41

(10) Dropping Resistor
(11) C-59
(12) H-41, H-42
(13) H-3
(14) Relay and Fuse Box (X-17)
(15) Glow Relay-1 (C-51, C-52)
(16) Glow Relay-2 (C-53, C-54, C-55)
(17) C-39
(18) H-13
(19) C-60

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

D08RWA26

8D–116

WIRING SYSTEM

QOS and EGR System (4JG2)

General Description

The circuit consists of the starter switch, QOS/EGR
control unit, glow relay, charge relay, fuel cut
solenoid, dropping resistor, thermo sensor, glow
indicator light (meter), glow plug, vehicle speed
sensor, tacho sensor, throttle position sensor, EVRV
and VSV; EGR.
The engine coolant temperature at the time of the
engine start-up is sensed by the thermo sensor to
change the glow time so that the optimum starting
conditions can always be obtained.
The idling speed just after the engine start-up can
also be placed in the most suitable conditions in
accordance with the coolant temperature by the
operation of the delay timer.

The indicator timer is activated upon the starter
switch turned to the ON position, and the indicator
light comes on for as much time as suitable for the
engine coolant temperature at the time of the
engine start-up.
EGR system controls the information of NOx by
returning a small amount of exhaust gas from the
intake manifold to the combustion chamber
through the EGR valve.

WIRING SYSTEM

8D–117

Circuit Diagram (RHD)-1

0.5

B

0.5

W/G

0.85

W/G

0.5

B

0.5

B/Y

0.5

B/Y

0.85

B/Y

0.5

L/Y

0.5

L/Y

0.5

P/W

0.85

B/O

0.85

B/O

0.85

B/O

0.3

P/W

0.85

B/Y

0.85

B/Y

0.85

B/Y

3.0

B/Y

C-8 15A

ENGINE

CHARGE

RELA

Y

GLOW

INDICA

T

O

R

LIGHT

(METER)

FUEL

 CUT

SOLENOID

AMBIENT

THERMO

SW

QWS

THERMO SW

(ENGINE)

0.85

W/L

QOS/EGR CONTROL

 UNIT

C-66

18

C-66

9

C-66

5

C-66

17

C-66

20

C-66

16

C-39

1

X-17

2

I-9

15

H-41

12

H-9

14

X-17

3

X-17

5

H-3

3

1

X-17

26

I-9

4

X-17

FENDER-RH

ST

AR

TER SW

(IG1)

AC GENERA

T

O

R

(L)

C-10 10A

METER, GAUGE

C-9 15A

FUEL

 CUT

A

19

H-15

3.0

W/G

0.5

W/R

0.5

BR

0.5

BR

0.5

BR

0.5

LG/Y

0.5

G/B

0.5

G/W

0.5

W/R

C-1 10A

ST

AR

TER

RELA

Y

ST

AR

TER SW

(ST)

4

H-7

1

E-40

11

H-4

2

C-74

3.0

L/R

0.5

BR

0.5

BR

0.5

BR

C-20 10A

AIR CON

HEA

TER & 

A/C

RELA

Y(4)

16

H-26

0.5

LG/W

0.3

LG/W

VEHICLE SPEED

SENSOR(3)

15

H-5

12

H-7

6

H-26

H-5

7

H-41

2

H-4

7

E-40

2

7

E-37

1

H-7

B

C

C

H-16

7

C-74

1

D08RW695