Opel Frontera UBS. Service manual — part 672

8D–118

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–119

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
RELAY

GLOW
INDICATOR
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

STARTER SW

(IG1)

AC GENERATOR

(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
STARTER
RELAY

STARTER 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

HEATER & A/C

RELAY(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

8D–120

WIRING SYSTEM

Circuit Diagram (RHD)-2

DROPPING
RESISTOR

GLOW
PLUG

GLOW
RELAY-2

QOS/EGR CONTROL UNIT

GLOW
RELAY-1

C-66

6

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

BATT.(+)

C-55

1

2

C-55

A

C-66

7

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

VSV;
EVRV

B

C-66

10

0.5

R

0.85

B/Y

0.85

B/Y

C-72

1

2

C-72

VSV;
EGR

C-66

4

0.5

G

0.85

B/Y

C-73

1

2

C-73

D08RW696

WIRING SYSTEM

8D–121

1

2

E-41

E-41

QOS THERMO SENSOR

(ENGINE)

TACHO
SENSOR
(INJECTION
PUMP)

QOS/EGR CONTROL UNIT

C-16

0.5

B

0.5

B/P

0.5

B/P

0.5

B/P

0.5

B/P

0.5

B/R

0.5

B/R

0.5

R/G

0.5

R/G

0.5

R/W

0.5

R/W

0.5

Y/L

0.5

Y

0.5

Y/L

0.5

Y

0.5

B/Y

0.5

B

7

C-66

3

FENDER

-LH

C-39

6

4

FENDER

-RH

H-41

1

E-36

10

H-4

C-66

14

C-66

15

E-36

2

H-4

6

C-66

2

C-66

1

C-66

12

C-66

11

C-66

13

2

THROTTLE POSITION

SENSOR

(INJECTION PUMP)

H-4

9

1

H-4

1

3

H-4

E-5

E-5

E-5

5

H-4

8

H-4

12

D08RW697

Circuit Diagram (RHD)-3