Opel Frontera UBS. Service manual — part 1309
QOS III PREHEATING SYSTEM 6D6 – 1
PAGE
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . 6D6- 1
System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6D6- 2
GENERAL DESCRIPTION
QOS III preheating system features a quick-on glow
plug with thermometer control of the glowing time
and the afterglow time function.
The system consists of a controller, indicator lamp,
thermosensor, vehicle speedsensor, dropping
resistor, relay (2 pcs), and temperature self-control
type glow plug (4 pcs).
With the employment of the thermosensor, the
glow time changes according to the engine coolant
temperature, thus allowing optimum starting
conditions to be obtained.
The afterglow time function is controlled by
thermosensor, vehicle speed sensor, and the
engine runstall sensor (charge relay).
SECTION 6D6
QOSIII PREHEATING SYSTEM
CONTENTS
6D6 – 2 QOS III PREHEATING SYSTEM
SYSTEM DIAGRAM
WIRING DIAGRAM
ON
B
ST
G
low relay No.1
Starter SW
Battery
Engine
Glow relay No.2
Glow indicator
Charge
relay
Glow plug
Thermo
sensor
Controller;
QOS-III
Speed sensor
Dropping
registor
QOS III Timing Chart
ST
ON
OFF
ON
OFF
ON
OFF
ON
OFF
18Km/h
9km/h
ON
OFF
ON
OFF
ON
OFF
Starter SW
Starter SW is turned to
“ST” before indicator light
goes out.
Starter SW is turned to
“ST” after indicator light
goes out.
Starter SW
is left “ON”
Indicator timer
After glow timer
Charge relay
Indicator light
Relay 1
Relay 2
Above
Vehicle speed below
t i
t i
t i
t a
t a
t d
t d
t d
t d
Glow plug
temperature
0
t
0
t
0
t
: Indicator light “ON” time
: Rapid after glow (Delay timer) time
: After glow time
ti
td
ta
(For broken lines,
water temperature
is 70
°
C or above)
QOS III PREHEATING SYSTEM 6D6 – 3
QOS III FLOW CHART
6D6 – 4 QOS III PREHEATING SYSTEM
QOS III BLOCK CHART
“ST” detection
“ST”
Indicator timer
11
1
“ON”
“ST”
“ON”
13
td
Delay timer
°
C
td
°
C
Reset
Reset
5
ta
Afterglow timer
Coolant temperature sensor
70
°
C
All reset
12
Vehicle speed detection
9 Km/h
18 Km/h
Complete combustion detection
STALL
RUN
Set
8
4
9
6
10
Thermo-sensor
Speed sensor
Generator
Charge relay
Glow relay No. 1
Glow lamp
(12V, 3.4 W)
Glow relay No. 2
Glow plug
Battery 12V
Starter SW
“OFF” “ST”
“ACC”“ON”
: Indicator lamp light – up time
: Quick afterglow time
: Afterglow time
ti
td
ta
7
2
3
Dropping
register
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