Opel Frontera UBS. Service manual — part 425
QOS III PREHEATING SYSTEM 6D6 – 5
Inspection on QOSIII System Operation
I
Inspection on Quick Heating Operation
1.
Disconnect thermo-sensor connection on the
thermostat housing.
2.
Connect the circuit tester between glow plug and
engine earth.
3.
Inspect the following items with starter switch set to
ON position (but do not start the engine).
1) The glow indicator shall light for about 5 sec.
2) The circuit tester shall indicate power supply
voltage for 9 ~ 13 sec.
If above specifications are not satisfied, inspect
wire harness, glow relay and thermo-sensor. If
satisfied, inspect glow plug.
II
Inspection on Afterglow Operation
1.
Disconnect thermo-sensor connection on the
thermostat housing.
2.
Connect the circuit tester between glow plug and
engine earth.
3.
Inspect the following item with start the engine.
1) The circuit tester shall indicate about 7 volts after
360 seconds of engine start.
•
If above specifications are not satisfied, inspect
battery voltage, engine earth, wiring harness, glow
plug, dropping resistor, relay No. 2 read switch
and charge relay.
THERMO SENSOR
Measure the resistance depending on the water tempera-
ture as shown in the left figure. (Measuring range: -10°C ~
50°C)
Current (mA)
20 ± 1
1.0
50 ± 1
Resistance (K )
1.0
2.0 ~ 3.0
0.6 ~ 1.0
Temperature
6D6 – 6 QOS III PREHEATING SYSTEM
8 (0.8/69)
Torque
N·m (Kg·m/lb·in)
23 (2.3/17)
Torque
N·m (Kg·m/lb·ft)
0.8 ~ 1.0
Resistance at normal temperature
LOCTITE #262
or equivalent
When installing the thermo sensor, apply sealant (Loctite
#262 or equivalent) to arrowed portion in the left figure to
prevent water leakage.
GLOW PLUG
Inspect the resistance
No Continuity
2 – 4
Continuity
1 – 3
Continuity
2 – 4
Continuity
1 – 2
No Continuity
1 – 3
Continuity
4 – 5
No Continuity
1 – 2
Continuity
1 – 3
224 ~ 236
Resistance of normal ambient temperature
m
DROPPING RESISTOR
Inspect the resistance
GLOW PLUG RELAY
Inspect the continuity
If apply the battery voltage to terminal between 1 - 3
CHARGE RELAY
Inspect the continuity
If apply the battery voltage to terminal between 4 - 5
SECTION 6F
ENGINE EXHAUST
CAUTION:
overheating of the floor pan and possible damage
to the passenger compartment, insulation and trim
materials.
Exhaust system components must have enough
clearance from the underbody to prevent
CONTENTS
PAGE
General Description . . . . . . . . . . . . . . . . . . . . . . . . . .
6F-2
Hangers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6F-2
Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
6F-2
On-Vehicle Service . . . . . . . . . . . . . . . . . . . . . . . . . . ..
6F-3
Front Exhaust Pipe . . . . . . . . . . . . . . . . . . . . . . . . . ..
6F-3
Center Exhaust Pipe . . . . . . . . . . . . . . . . . . . . . . . . .
6F-5
Exhaust Silencer. . . . . . . . . . . . . . . . . . . . . . . . . . ..
6F-7
Rear Exhaust Pipe . . . . . . . . . . . . . . . . . . . . . . . . . ...
6F-9
6F – 2 ENGINE EXHAUST
GENERAL DESCRIPTION
150RV013
When inspecting or replacing exhaust system
components, make sure there is adequate clearance from
all points on the underbody to prevent overheating of the
floor pan and possible damage to the passenger
compartment insulation and trim materials.
Check complete exhaust system and nearby body areas
and rear compartment lid for broken, damaged, missing
or mispositioned parts, open seams, holes, loose
connections or other deterioration which could permit
exhaust fumes to seep into the rear compartment or
passenger compartment. Dust or water in the rear
compartment may be an indication of a problem in one of
these areas. Any faulty areas should be corrected
immediately.
HANGERS
Various types of hangers are used to support exhaust
system(s). These include conventional rubber straps,
rubber rings, and rubber blocks.
The installation of exhaust system supports is very
important, as improperly installed supports can cause
annoying vibrations which can be difficult to diagnose.
GASKET
The gasket must be replaced whenever a new exhaust
pipe, muffler or exhaust throttle is installed.
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